/////////////////////////////////////////////////////////////////////////////// // // Copyright (c) 2015 Microsoft Corporation. All rights reserved. // // This code is licensed under the MIT License (MIT). // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. // /////////////////////////////////////////////////////////////////////////////// #include <gtest/gtest.h> #include <gsl/byte> // for byte #include <gsl/span> // for span, span_iterator, operator==, operator!= #include <array> // for array #include <cstddef> // for ptrdiff_t #include <iterator> // for reverse_iterator, operator-, operator== #include <type_traits> // for integral_constant<>::value, is_default_co... #include <utility> #include <vector> // for vector using namespace std; using namespace gsl; // Below are tests that verify the gsl interface support the same things as the std // Ranges and Concepts support need to be added later. struct Base { }; struct Derived : Base { }; static_assert(std::is_convertible<Derived*, Base*>::value, "std::is_convertible<Derived*, Base*>"); static_assert(!std::is_convertible<Derived (*)[], Base (*)[]>::value, "!std::is_convertible<Derived(*)[], Base(*)[]>"); // int*(*) [], int const* const(*)[] was identified as an issue in CWG330 and the resolution was // provided with N4261. template <class T = int> void ArrayConvertibilityCheck() { #if __cplusplus >= 201703l if constexpr (std::is_convertible<T*(*) [], T const* const(*)[]>::value) { std::array<T*, 3> stl_nullptr{{nullptr, nullptr, nullptr}}; gsl::span<const T* const> sp_const_nullptr_1{stl_nullptr}; EXPECT_TRUE(sp_const_nullptr_1.data() == stl_nullptr.data()); EXPECT_TRUE(sp_const_nullptr_1.size() == 3); gsl::span<const T* const> sp_const_nullptr_2{std::as_const(stl_nullptr)}; EXPECT_TRUE(sp_const_nullptr_2.data() == stl_nullptr.data()); EXPECT_TRUE(sp_const_nullptr_2.size() == 3); static_assert(std::is_same<decltype(gsl::span{stl_nullptr}), gsl::span<T*, 3>>::value, "std::is_same< decltype(span{stl_nullptr}), span<T*, 3>>::value"); static_assert( std::is_same<decltype(gsl::span{std::as_const(stl_nullptr)}), gsl::span<T* const, 3>>::value, "std::is_same< decltype(span{std::as_const(stl_nullptr)}), span<T* const, " "3>>::value"); } #endif } TEST(span_compatibility_tests, assertion_tests) { int arr[3]{10, 20, 30}; std::array<int, 3> stl{{100, 200, 300}}; ArrayConvertibilityCheck(); { gsl::span<int> sp_dyn; EXPECT_TRUE(sp_dyn.data() == nullptr); EXPECT_TRUE(sp_dyn.size() == 0); EXPECT_TRUE(sp_dyn.empty()); } { gsl::span<int, 0> sp_zero; EXPECT_TRUE(sp_zero.data() == nullptr); EXPECT_TRUE(sp_zero.size() == 0); EXPECT_TRUE(sp_zero.empty()); gsl::span<int> sp_dyn_a(arr, 3); gsl::span<int> sp_dyn_b(begin(arr), 3); EXPECT_TRUE(sp_dyn_a.data() == std::begin(arr)); EXPECT_TRUE(sp_dyn_b.data() == std::begin(arr)); EXPECT_TRUE(sp_dyn_a.size() == 3); EXPECT_TRUE(sp_dyn_b.size() == 3); gsl::span<int, 3> sp_three_a(arr, 3); gsl::span<int, 3> sp_three_b(begin(arr), 3); EXPECT_TRUE(sp_three_a.data() == std::begin(arr)); EXPECT_TRUE(sp_three_b.data() == std::begin(arr)); EXPECT_TRUE(sp_three_a.size() == 3); EXPECT_TRUE(sp_three_b.size() == 3); gsl::span<const int> sp_const_a(arr, 3); gsl::span<const int> sp_const_b(begin(arr), 3); EXPECT_TRUE(sp_const_a.data() == std::begin(arr)); EXPECT_TRUE(sp_const_b.data() == std::begin(arr)); EXPECT_TRUE(sp_const_a.size() == 3); EXPECT_TRUE(sp_const_b.size() == 3); #if __cplusplus >= 201703l gsl::span<const int> sp_const_c(std::as_const(arr), 3); EXPECT_TRUE(sp_const_c.data() == std::begin(arr)); EXPECT_TRUE(sp_const_c.size() == 3); #endif // __cplusplus >= 201703l gsl::span<const int> sp_const_d(cbegin(arr), 3); EXPECT_TRUE(sp_const_d.data() == std::begin(arr)); EXPECT_TRUE(sp_const_d.size() == 3); } { gsl::span<int> sp_dyn_a(begin(arr), std::end(arr)); EXPECT_TRUE(sp_dyn_a.data() == std::begin(arr)); EXPECT_TRUE(sp_dyn_a.size() == 3); gsl::span<int, 3> sp_three_a(begin(arr), std::end(arr)); EXPECT_TRUE(sp_three_a.data() == std::begin(arr)); EXPECT_TRUE(sp_three_a.size() == 3); gsl::span<const int> sp_const_a(begin(arr), std::end(arr)); gsl::span<const int> sp_const_b(begin(arr), std::cend(arr)); gsl::span<const int> sp_const_c(cbegin(arr), std::end(arr)); gsl::span<const int> sp_const_d(cbegin(arr), std::cend(arr)); EXPECT_TRUE(sp_const_a.data() == std::begin(arr)); EXPECT_TRUE(sp_const_b.data() == std::begin(arr)); EXPECT_TRUE(sp_const_c.data() == std::begin(arr)); EXPECT_TRUE(sp_const_d.data() == std::begin(arr)); EXPECT_TRUE(sp_const_a.size() == 3); EXPECT_TRUE(sp_const_b.size() == 3); EXPECT_TRUE(sp_const_c.size() == 3); EXPECT_TRUE(sp_const_d.size() == 3); } { gsl::span<int> sp_dyn_a(arr); gsl::span<int> sp_dyn_b(stl); gsl::span<int> sp_dyn_c{stl}; gsl::span<const int> sp_dyn_d{stl}; EXPECT_TRUE(sp_dyn_a.data() == std::begin(arr)); EXPECT_TRUE(sp_dyn_b.data() == stl.data()); EXPECT_TRUE(sp_dyn_a.size() == 3); EXPECT_TRUE(sp_dyn_b.size() == 3); gsl::span<int, 3> sp_three_a(arr); gsl::span<int, 3> sp_three_b(stl); EXPECT_TRUE(sp_three_a.data() == std::begin(arr)); EXPECT_TRUE(sp_three_b.data() == stl.data()); EXPECT_TRUE(sp_three_a.size() == 3); EXPECT_TRUE(sp_three_b.size() == 3); gsl::span<const int> sp_const_w(arr); gsl::span<const int> sp_const_y(stl); EXPECT_TRUE(sp_const_w.data() == std::begin(arr)); EXPECT_TRUE(sp_const_y.data() == stl.data()); EXPECT_TRUE(sp_const_w.size() == 3); EXPECT_TRUE(sp_const_y.size() == 3); #if __cplusplus >= 201703l gsl::span<const int> sp_const_x(std::as_const(arr)); EXPECT_TRUE(sp_const_x.data() == std::begin(arr)); EXPECT_TRUE(sp_const_x.size() == 3); gsl::span<const int> sp_const_z(std::as_const(stl)); EXPECT_TRUE(sp_const_z.data() == stl.data()); EXPECT_TRUE(sp_const_z.size() == 3); #endif // __cplusplus >= 201703l } { const gsl::span<int> orig_dyn(arr); const gsl::span<int, 3> orig_three(arr); const gsl::span<const int> orig_const_dyn(arr); const gsl::span<const int, 3> orig_const_three(arr); gsl::span<int> sp_a(orig_dyn); gsl::span<int> sp_b(orig_three); gsl::span<int, 3> sp_c(orig_three); gsl::span<const int> sp_d(orig_dyn); gsl::span<const int> sp_e(orig_three); gsl::span<const int> sp_f(orig_const_dyn); gsl::span<const int> sp_g(orig_const_three); gsl::span<const int, 3> sp_h(orig_three); gsl::span<const int, 3> sp_i(orig_const_three); EXPECT_TRUE(sp_a.data() == std::begin(arr)); EXPECT_TRUE(sp_b.data() == std::begin(arr)); EXPECT_TRUE(sp_c.data() == std::begin(arr)); EXPECT_TRUE(sp_d.data() == std::begin(arr)); EXPECT_TRUE(sp_e.data() == std::begin(arr)); EXPECT_TRUE(sp_f.data() == std::begin(arr)); EXPECT_TRUE(sp_g.data() == std::begin(arr)); EXPECT_TRUE(sp_h.data() == std::begin(arr)); EXPECT_TRUE(sp_i.data() == std::begin(arr)); EXPECT_TRUE(sp_a.size() == 3); EXPECT_TRUE(sp_b.size() == 3); EXPECT_TRUE(sp_c.size() == 3); EXPECT_TRUE(sp_d.size() == 3); EXPECT_TRUE(sp_e.size() == 3); EXPECT_TRUE(sp_f.size() == 3); EXPECT_TRUE(sp_g.size() == 3); EXPECT_TRUE(sp_h.size() == 3); EXPECT_TRUE(sp_i.size() == 3); } { gsl::span<int> sp_dyn(arr); gsl::span<int, 3> sp_three(arr); gsl::span<const int> sp_const_dyn(arr); gsl::span<const int, 3> sp_const_three(arr); EXPECT_TRUE(sp_dyn.data() == std::begin(arr)); EXPECT_TRUE(sp_three.data() == std::begin(arr)); EXPECT_TRUE(sp_const_dyn.data() == std::begin(arr)); EXPECT_TRUE(sp_const_three.data() == std::begin(arr)); EXPECT_TRUE(sp_dyn.size() == 3); EXPECT_TRUE(sp_three.size() == 3); EXPECT_TRUE(sp_const_dyn.size() == 3); EXPECT_TRUE(sp_const_three.size() == 3); int other[4]{12, 34, 56, 78}; sp_dyn = gsl::span<int>{other}; sp_three = gsl::span<int, 3>{stl}; sp_const_dyn = gsl::span<const int>{other}; sp_const_three = gsl::span<const int, 3>{stl}; EXPECT_TRUE(sp_dyn.data() == std::begin(other)); EXPECT_TRUE(sp_three.data() == stl.data()); EXPECT_TRUE(sp_const_dyn.data() == std::begin(other)); EXPECT_TRUE(sp_const_three.data() == stl.data()); EXPECT_TRUE(sp_dyn.size() == 4); EXPECT_TRUE(sp_three.size() == 3); EXPECT_TRUE(sp_const_dyn.size() == 4); EXPECT_TRUE(sp_const_three.size() == 3); } { gsl::span<int>::iterator it_dyn{}; { gsl::span<int> sp_dyn(arr); it_dyn = sp_dyn.begin(); } EXPECT_TRUE(*it_dyn == arr[0]); EXPECT_TRUE(it_dyn[2] == arr[2]); gsl::span<int, 3>::iterator it_three{}; { gsl::span<int, 3> sp_three(stl); it_three = sp_three.begin(); } EXPECT_TRUE(*it_three == stl[0]); EXPECT_TRUE(it_three[2] == stl[2]); } { int sequence[9]{10, 20, 30, 40, 50, 60, 70, 80, 90}; const gsl::span<int> sp_dyn(sequence); const gsl::span<int, 9> sp_nine(sequence); auto first_3 = sp_dyn.first<3>(); auto first_4 = sp_nine.first<4>(); auto first_5 = sp_dyn.first(5); auto first_6 = sp_nine.first(6); static_assert(noexcept(sp_dyn.first<3>()), "noexcept(sp_dyn.first<3>())"); // strengthened static_assert(noexcept(sp_nine.first<4>()), "noexcept(sp_nine.first<4>())"); // strengthened static_assert(noexcept(sp_dyn.first(5)), "noexcept(sp_dyn.first(5))"); // strengthened static_assert(noexcept(sp_nine.first(6)), "noexcept(sp_nine.first(6))"); // strengthened static_assert(is_same<decltype(first_3), gsl::span<int, 3>>::value, "is_same<decltype(first_3), gsl::span<int, 3>>::value"); static_assert(is_same<decltype(first_4), gsl::span<int, 4>>::value, "is_same<decltype(first_4), gsl::span<int, 4>>::value"); static_assert(is_same<decltype(first_5), gsl::span<int>>::value, "is_same<decltype(first_5), gsl::span<int>>::value"); static_assert(is_same<decltype(first_6), gsl::span<int>>::value, "is_same<decltype(first_6), gsl::span<int>>::value"); EXPECT_TRUE(first_3.data() == std::begin(sequence)); EXPECT_TRUE(first_4.data() == std::begin(sequence)); EXPECT_TRUE(first_5.data() == std::begin(sequence)); EXPECT_TRUE(first_6.data() == std::begin(sequence)); EXPECT_TRUE(first_3.size() == 3); EXPECT_TRUE(first_4.size() == 4); EXPECT_TRUE(first_5.size() == 5); EXPECT_TRUE(first_6.size() == 6); auto last_3 = sp_dyn.last<3>(); auto last_4 = sp_nine.last<4>(); auto last_5 = sp_dyn.last(5); auto last_6 = sp_nine.last(6); static_assert(noexcept(sp_dyn.last<3>()), "noexcept(sp_dyn.last<3>())"); // strengthened static_assert(noexcept(sp_nine.last<4>()), "noexcept(sp_nine.last<4>())"); // strengthened static_assert(noexcept(sp_dyn.last(5)), "noexcept(sp_dyn.last(5))"); // strengthened static_assert(noexcept(sp_nine.last(6)), "noexcept(sp_nine.last(6))"); // strengthened static_assert(is_same<decltype(last_3), gsl::span<int, 3>>::value, "is_same<decltype(last_3), gsl::span<int, 3>>::value"); static_assert(is_same<decltype(last_4), gsl::span<int, 4>>::value, "is_same<decltype(last_4), gsl::span<int, 4>>::value"); static_assert(is_same<decltype(last_5), gsl::span<int>>::value, "is_same<decltype(last_5), gsl::span<int>>::value"); static_assert(is_same<decltype(last_6), gsl::span<int>>::value, "is_same<decltype(last_6), gsl::span<int>>::value"); EXPECT_TRUE(last_3.data() == std::begin(sequence) + 6); EXPECT_TRUE(last_4.data() == std::begin(sequence) + 5); EXPECT_TRUE(last_5.data() == std::begin(sequence) + 4); EXPECT_TRUE(last_6.data() == std::begin(sequence) + 3); EXPECT_TRUE(last_3.size() == 3); EXPECT_TRUE(last_4.size() == 4); EXPECT_TRUE(last_5.size() == 5); EXPECT_TRUE(last_6.size() == 6); auto offset_3 = sp_dyn.subspan<3>(); auto offset_4 = sp_nine.subspan<4>(); auto offset_5 = sp_dyn.subspan(5); auto offset_6 = sp_nine.subspan(6); static_assert(noexcept(sp_dyn.subspan<3>()), "noexcept(sp_dyn.subspan<3>())"); // strengthened static_assert(noexcept(sp_nine.subspan<4>()), "noexcept(sp_nine.subspan<4>())"); // strengthened static_assert(noexcept(sp_dyn.subspan(5)), "noexcept(sp_dyn.subspan(5))"); // strengthened static_assert(noexcept(sp_nine.subspan(6)), "noexcept(sp_nine.subspan(6))"); // strengthened static_assert(is_same<decltype(offset_3), gsl::span<int>>::value, "is_same<decltype(offset_3), gsl::span<int>>::value"); static_assert(is_same<decltype(offset_4), gsl::span<int, 5>>::value, "is_same<decltype(offset_4), gsl::span<int, 5>>::value"); static_assert(is_same<decltype(offset_5), gsl::span<int>>::value, "is_same<decltype(offset_5), gsl::span<int>>::value"); static_assert(is_same<decltype(offset_6), gsl::span<int>>::value, "is_same<decltype(offset_6), gsl::span<int>>::value"); EXPECT_TRUE(offset_3.data() == std::begin(sequence) + 3); EXPECT_TRUE(offset_4.data() == std::begin(sequence) + 4); EXPECT_TRUE(offset_5.data() == std::begin(sequence) + 5); EXPECT_TRUE(offset_6.data() == std::begin(sequence) + 6); EXPECT_TRUE(offset_3.size() == 6); EXPECT_TRUE(offset_4.size() == 5); EXPECT_TRUE(offset_5.size() == 4); EXPECT_TRUE(offset_6.size() == 3); auto subspan_3 = sp_dyn.subspan<3, 2>(); auto subspan_4 = sp_nine.subspan<4, 2>(); auto subspan_5 = sp_dyn.subspan(5, 2); auto subspan_6 = sp_nine.subspan(6, 2); static_assert(noexcept(sp_dyn.subspan<3, 2>()), "noexcept(sp_dyn.subspan<3, 2>())"); // strengthened static_assert(noexcept(sp_nine.subspan<4, 2>()), "noexcept(sp_nine.subspan<4, 2>())"); // strengthened static_assert(noexcept(sp_dyn.subspan(5, 2)), "noexcept(sp_dyn.subspan(5, 2))"); // strengthened static_assert(noexcept(sp_nine.subspan(6, 2)), "noexcept(sp_nine.subspan(6, 2))"); // strengthened static_assert(is_same<decltype(subspan_3), gsl::span<int, 2>>::value, "is_same<decltype(subspan_3), gsl::span<int, 2>>::value"); static_assert(is_same<decltype(subspan_4), gsl::span<int, 2>>::value, "is_same<decltype(subspan_4), gsl::span<int, 2>>::value"); static_assert(is_same<decltype(subspan_5), gsl::span<int>>::value, "is_same<decltype(subspan_5), gsl::span<int>>::value"); static_assert(is_same<decltype(subspan_6), gsl::span<int>>::value, "is_same<decltype(subspan_6), gsl::span<int>>::value"); EXPECT_TRUE(subspan_3.data() == std::begin(sequence) + 3); EXPECT_TRUE(subspan_4.data() == std::begin(sequence) + 4); EXPECT_TRUE(subspan_5.data() == std::begin(sequence) + 5); EXPECT_TRUE(subspan_6.data() == std::begin(sequence) + 6); EXPECT_TRUE(subspan_3.size() == 2); EXPECT_TRUE(subspan_4.size() == 2); EXPECT_TRUE(subspan_5.size() == 2); EXPECT_TRUE(subspan_6.size() == 2); static_assert(noexcept(sp_dyn.size()), "noexcept(sp_dyn.size())"); static_assert(noexcept(sp_dyn.size_bytes()), "noexcept(sp_dyn.size_bytes())"); static_assert(noexcept(sp_dyn.empty()), "noexcept(sp_dyn.empty())"); static_assert(noexcept(sp_dyn[0]), "noexcept(sp_dyn[0])"); // strengthened static_assert(noexcept(sp_dyn.front()), "noexcept(sp_dyn.front())"); // strengthened static_assert(noexcept(sp_dyn.back()), "noexcept(sp_dyn.back())"); // strengthened static_assert(noexcept(sp_dyn.data()), "noexcept(sp_dyn.data())"); static_assert(noexcept(sp_dyn.begin()), "noexcept(sp_dyn.begin())"); static_assert(noexcept(sp_dyn.end()), "noexcept(sp_dyn.end())"); static_assert(noexcept(sp_dyn.rbegin()), "noexcept(sp_dyn.rbegin())"); static_assert(noexcept(sp_dyn.rend()), "noexcept(sp_dyn.rend())"); static_assert(noexcept(sp_nine.size()), "noexcept(sp_nine.size())"); static_assert(noexcept(sp_nine.size_bytes()), "noexcept(sp_nine.size_bytes())"); static_assert(noexcept(sp_nine.empty()), "noexcept(sp_nine.empty())"); static_assert(noexcept(sp_nine[0]), "noexcept(sp_nine[0])"); // strengthened static_assert(noexcept(sp_nine.front()), "noexcept(sp_nine.front())"); // strengthened static_assert(noexcept(sp_nine.back()), "noexcept(sp_nine.back())"); // strengthened static_assert(noexcept(sp_nine.data()), "noexcept(sp_nine.data())"); static_assert(noexcept(sp_nine.begin()), "noexcept(sp_nine.begin())"); static_assert(noexcept(sp_nine.end()), "noexcept(sp_nine.end())"); static_assert(noexcept(sp_nine.rbegin()), "noexcept(sp_nine.rbegin())"); static_assert(noexcept(sp_nine.rend()), "noexcept(sp_nine.rend())"); EXPECT_TRUE(sp_dyn.size() == 9); EXPECT_TRUE(sp_nine.size() == 9); EXPECT_TRUE(sp_dyn.size_bytes() == 9 * sizeof(int)); EXPECT_TRUE(sp_nine.size_bytes() == 9 * sizeof(int)); EXPECT_TRUE(!sp_dyn.empty()); EXPECT_TRUE(!sp_nine.empty()); EXPECT_TRUE(sp_dyn[0] == 10); EXPECT_TRUE(sp_nine[0] == 10); EXPECT_TRUE(sp_dyn[8] == 90); EXPECT_TRUE(sp_nine[8] == 90); EXPECT_TRUE(sp_dyn.front() == 10); EXPECT_TRUE(sp_nine.front() == 10); EXPECT_TRUE(sp_dyn.back() == 90); EXPECT_TRUE(sp_nine.back() == 90); EXPECT_TRUE(&sp_dyn.front() == std::begin(sequence)); EXPECT_TRUE(&sp_nine.front() == std::begin(sequence)); EXPECT_TRUE(&sp_dyn[4] == std::begin(sequence) + 4); EXPECT_TRUE(&sp_nine[4] == std::begin(sequence) + 4); EXPECT_TRUE(&sp_dyn.back() == std::begin(sequence) + 8); EXPECT_TRUE(&sp_nine.back() == std::begin(sequence) + 8); EXPECT_TRUE(sp_dyn.data() == std::begin(sequence)); EXPECT_TRUE(sp_nine.data() == std::begin(sequence)); EXPECT_TRUE(*sp_dyn.begin() == 10); EXPECT_TRUE(*sp_nine.begin() == 10); EXPECT_TRUE(sp_dyn.end()[-2] == 80); EXPECT_TRUE(sp_nine.end()[-2] == 80); EXPECT_TRUE(*sp_dyn.rbegin() == 90); EXPECT_TRUE(*sp_nine.rbegin() == 90); EXPECT_TRUE(sp_dyn.rend()[-2] == 20); EXPECT_TRUE(sp_nine.rend()[-2] == 20); static_assert(is_same<decltype(sp_dyn.begin()), gsl::span<int>::iterator>::value, "is_same<decltype(sp_dyn.begin()), gsl::span<int>::iterator>::value"); static_assert(is_same<decltype(sp_nine.begin()), gsl::span<int, 9>::iterator>::value, "is_same<decltype(sp_nine.begin()), gsl::span<int, 9>::iterator>::value"); static_assert(is_same<decltype(sp_dyn.end()), gsl::span<int>::iterator>::value, "is_same<decltype(sp_dyn.end()), gsl::span<int>::iterator>::value"); static_assert(is_same<decltype(sp_nine.end()), gsl::span<int, 9>::iterator>::value, "is_same<decltype(sp_nine.end()), gsl::span<int, 9>::iterator>::value"); static_assert( is_same<decltype(sp_dyn.rbegin()), gsl::span<int>::reverse_iterator>::value, "is_same<decltype(sp_dyn.rbegin()), gsl::span<int>::reverse_iterator>::value"); static_assert( is_same<decltype(sp_nine.rbegin()), gsl::span<int, 9>::reverse_iterator>::value, "is_same<decltype(sp_nine.rbegin()), gsl::span<int, 9>::reverse_iterator>::value"); static_assert(is_same<decltype(sp_dyn.rend()), gsl::span<int>::reverse_iterator>::value, "is_same<decltype(sp_dyn.rend()), gsl::span<int>::reverse_iterator>::value"); static_assert( is_same<decltype(sp_nine.rend()), gsl::span<int, 9>::reverse_iterator>::value, "is_same<decltype(sp_nine.rend()), gsl::span<int, 9>::reverse_iterator>::value"); } { int sequence[9]{10, 20, 30, 40, 50, 60, 70, 80, 90}; constexpr size_t SizeBytes = sizeof(sequence); const gsl::span<int> sp_dyn(sequence); const gsl::span<int, 9> sp_nine(sequence); const gsl::span<const int> sp_const_dyn(sequence); const gsl::span<const int, 9> sp_const_nine(sequence); static_assert(noexcept(as_bytes(sp_dyn)), "noexcept(as_bytes(sp_dyn))"); static_assert(noexcept(as_bytes(sp_nine)), "noexcept(as_bytes(sp_nine))"); static_assert(noexcept(as_bytes(sp_const_dyn)), "noexcept(as_bytes(sp_const_dyn))"); static_assert(noexcept(as_bytes(sp_const_nine)), "noexcept(as_bytes(sp_const_nine))"); static_assert(noexcept(as_writable_bytes(sp_dyn)), "noexcept(as_writable_bytes(sp_dyn))"); static_assert(noexcept(as_writable_bytes(sp_nine)), "noexcept(as_writable_bytes(sp_nine))"); auto sp_1 = as_bytes(sp_dyn); auto sp_2 = as_bytes(sp_nine); auto sp_3 = as_bytes(sp_const_dyn); auto sp_4 = as_bytes(sp_const_nine); auto sp_5 = as_writable_bytes(sp_dyn); auto sp_6 = as_writable_bytes(sp_nine); static_assert(is_same<decltype(sp_1), gsl::span<const byte>>::value, "is_same<decltype(sp_1), gsl::span<const byte>>::value"); static_assert(is_same<decltype(sp_2), gsl::span<const byte, SizeBytes>>::value, "is_same<decltype(sp_2), gsl::span<const byte, SizeBytes>>::value"); static_assert(is_same<decltype(sp_3), gsl::span<const byte>>::value, "is_same<decltype(sp_3), gsl::span<const byte>>::value"); static_assert(is_same<decltype(sp_4), gsl::span<const byte, SizeBytes>>::value, "is_same<decltype(sp_4), gsl::span<const byte, SizeBytes>>::value"); static_assert(is_same<decltype(sp_5), gsl::span<byte>>::value, "is_same<decltype(sp_5), gsl::span<byte>>::value"); static_assert(is_same<decltype(sp_6), gsl::span<byte, SizeBytes>>::value, "is_same<decltype(sp_6), gsl::span<byte, SizeBytes>>::value"); EXPECT_TRUE(sp_1.data() == reinterpret_cast<const byte*>(begin(sequence))); EXPECT_TRUE(sp_2.data() == reinterpret_cast<const byte*>(begin(sequence))); EXPECT_TRUE(sp_3.data() == reinterpret_cast<const byte*>(begin(sequence))); EXPECT_TRUE(sp_4.data() == reinterpret_cast<const byte*>(begin(sequence))); EXPECT_TRUE(sp_5.data() == reinterpret_cast<byte*>(begin(sequence))); EXPECT_TRUE(sp_6.data() == reinterpret_cast<byte*>(begin(sequence))); EXPECT_TRUE(sp_1.size() == SizeBytes); EXPECT_TRUE(sp_2.size() == SizeBytes); EXPECT_TRUE(sp_3.size() == SizeBytes); EXPECT_TRUE(sp_4.size() == SizeBytes); EXPECT_TRUE(sp_5.size() == SizeBytes); EXPECT_TRUE(sp_6.size() == SizeBytes); } } // assertions for span's definition static_assert(std::is_same<decltype(gsl::dynamic_extent), const std::size_t>::value, "gsl::dynamic_extent must be respresented as std::size_t"); static_assert(gsl::dynamic_extent == static_cast<std::size_t>(-1), "gsl::dynamic_extent must be defined as the max value of std::size_t"); static_assert(std::is_same<decltype(gsl::span<int>::extent), const std::size_t>::value, "Ensure that the type of gsl::span::extent is std::size_t"); static_assert(gsl::span<int>::extent == gsl::dynamic_extent, "gsl::span<int>::extent should be equivalent to gsl::dynamic_extent"); static_assert(std::is_same<decltype(gsl::span<int, 3>::extent), const std::size_t>::value, "Ensure that the type of gsl::span::extent is std::size_t"); static_assert(gsl::span<int, 3>::extent == 3, "Ensure that span<int, 3>::extent is equal to 3"); static_assert(std::is_same<gsl::span<int>::element_type, int>::value, "span<int>::element_type should be int"); static_assert(std::is_same<gsl::span<int>::value_type, int>::value, "span<int>::value_type should be int"); static_assert(std::is_same<gsl::span<int>::size_type, std::size_t>::value, "span<int>::size_type should be std::size_t"); static_assert(std::is_same<gsl::span<int>::difference_type, ptrdiff_t>::value, "span<int>::difference_type should be std::ptrdiff_t"); static_assert(std::is_same<gsl::span<int>::pointer, int*>::value, "span<int>::pointer should be int*"); static_assert(std::is_same<gsl::span<int>::const_pointer, const int*>::value, "span<int>::const_pointer should be const int*"); static_assert(std::is_same<gsl::span<int>::reference, int&>::value, "span<int>::reference should be int&"); static_assert(std::is_same<gsl::span<int>::const_reference, const int&>::value, "span<int>::const_reference should be const int&"); static_assert(std::is_same<gsl::span<int, 3>::element_type, int>::value, "span<int, 3>::element_type should be int"); static_assert(std::is_same<gsl::span<int, 3>::value_type, int>::value, "span<int, 3>::value_type should be int"); static_assert(std::is_same<gsl::span<int, 3>::size_type, std::size_t>::value, "span<int, 3>::size_type should be std::size_t"); static_assert(std::is_same<gsl::span<int, 3>::difference_type, ptrdiff_t>::value, "span<int, 3>::difference_type should be std::ptrdiff_t"); static_assert(std::is_same<gsl::span<int, 3>::pointer, int*>::value, "span<int, 3>::pointer should be int*"); static_assert(std::is_same<gsl::span<int, 3>::const_pointer, const int*>::value, "span<int, 3>::const_pointer should be const int*"); static_assert(std::is_same<gsl::span<int, 3>::reference, int&>::value, "span<int, 3>::reference should be int&"); static_assert(std::is_same<gsl::span<int, 3>::const_reference, const int&>::value, "span<int, 3>::const_reference should be const int&"); static_assert(std::is_same<gsl::span<const int>::element_type, const int>::value, "span<const int>::element_type should be const int"); static_assert(std::is_same<gsl::span<const int>::value_type, int>::value, "span<const int>::value_type should be int"); static_assert(std::is_same<gsl::span<const int>::size_type, std::size_t>::value, "span<const int>::size_type should be size_t"); static_assert(std::is_same<gsl::span<const int>::difference_type, ptrdiff_t>::value, "span<const int>::difference_type should be ptrdiff_t"); static_assert(std::is_same<gsl::span<const int>::pointer, const int*>::value, "span<const int>::pointer should be const int*"); static_assert(std::is_same<gsl::span<const int>::const_pointer, const int*>::value, "span<const int>::const_pointer should be const int*"); static_assert(std::is_same<gsl::span<const int>::reference, const int&>::value, "span<const int>::reference should be const int&"); static_assert(std::is_same<gsl::span<const int>::const_reference, const int&>::value, "span<const int>::const_reference should be const int&"); static_assert(std::is_same<gsl::span<const int, 3>::element_type, const int>::value, "span<const int, 3>::element_type should be const int"); static_assert(std::is_same<gsl::span<const int, 3>::value_type, int>::value, "span<const int, 3>::value_type should be int"); static_assert(std::is_same<gsl::span<const int, 3>::size_type, std::size_t>::value, "span<const int, 3>::size_type should be size_t"); static_assert(std::is_same<gsl::span<const int, 3>::difference_type, ptrdiff_t>::value, "span<const int, 3>::difference_type should be ptrdiff_t"); static_assert(std::is_same<gsl::span<const int, 3>::pointer, const int*>::value, "span<const int, 3>::pointer should be const int*"); static_assert(std::is_same<gsl::span<const int, 3>::const_pointer, const int*>::value, "span<const int, 3>::const_pointer should be const int*"); static_assert(std::is_same<gsl::span<const int, 3>::reference, const int&>::value, "span<const int, 3>::reference should be const int&"); static_assert(std::is_same<gsl::span<const int, 3>::const_reference, const int&>::value, "span<const int, 3>::const_reference should be const int&"); // assertions for span_iterator static_assert(std::is_same<std::iterator_traits<gsl::span<int>::iterator>::pointer, int*>::value, "span<int>::iterator's pointer should be int*"); static_assert( std::is_same<gsl::span<int>::reverse_iterator, std::reverse_iterator<gsl::span<int>::iterator>>::value, "span<int>::reverse_iterator should equal std::reverse_iterator<span<int>::iterator>"); static_assert(std::is_same<std::iterator_traits<gsl::span<int, 3>::iterator>::pointer, int*>::value, "span<int, 3>::iterator's pointer should be int*"); static_assert( std::is_same<gsl::span<int, 3>::reverse_iterator, std::reverse_iterator<gsl::span<int, 3>::iterator>>::value, "span<int, 3>::reverse_iterator should equal std::reverse_iterator<span<int, 3>::iterator>"); static_assert( std::is_same<std::iterator_traits<gsl::span<const int>::iterator>::pointer, const int*>::value, "span<const int>::iterator's pointer should be int*"); static_assert(std::is_same<gsl::span<const int>::reverse_iterator, std::reverse_iterator<gsl::span<const int>::iterator>>::value, "span<const int>::reverse_iterator should equal std::reverse_iterator<span<const " "int>::iterator>"); static_assert(std::is_same<std::iterator_traits<gsl::span<const int, 3>::iterator>::pointer, const int*>::value, "span<const int, 3>::iterator's pointer should be int*"); static_assert(std::is_same<gsl::span<const int, 3>::reverse_iterator, std::reverse_iterator<gsl::span<const int, 3>::iterator>>::value, "span<const int, 3>::reverse_iterator should equal std::reverse_iterator<span<const " "int, 3>::iterator>"); // copyability assertions static_assert(std::is_trivially_copyable<gsl::span<int>>::value, "span<int> should be trivially copyable"); static_assert(std::is_trivially_copyable<gsl::span<int>::iterator>::value, "span<int>::iterator should be trivially copyable"); static_assert(std::is_trivially_copyable<gsl::span<int, 3>>::value, "span<int, 3> should be trivially copyable"); static_assert(std::is_trivially_copyable<gsl::span<int, 3>::iterator>::value, "span<int, 3>::iterator should be trivially copyable"); static_assert(std::is_trivially_copyable<gsl::span<const int>>::value, "span<const int> should be trivially copyable"); static_assert(std::is_trivially_copyable<gsl::span<const int>::iterator>::value, "span<const int>::iterator should be trivially copyable"); static_assert(std::is_trivially_copyable<gsl::span<const int, 3>>::value, "span<const int, 3> should be trivially copyable"); static_assert(std::is_trivially_copyable<gsl::span<const int, 3>::iterator>::value, "span<const int, 3>::iterator should be trivially copyable"); // nothrow constructible assertions static_assert(std::is_nothrow_constructible<gsl::span<int>, int*, std::size_t>::value, "std::is_nothrow_constructible<gsl::span<int>, int*, std::size_t>"); static_assert(std::is_nothrow_constructible<gsl::span<int>, int*, std::uint16_t>::value, "std::is_nothrow_constructible<gsl::span<int>, int*, std::uint16_t>"); static_assert(std::is_nothrow_constructible<gsl::span<int>, int*, int*>::value, "std::is_nothrow_constructible<gsl::span<int>, int*, int*>"); static_assert(std::is_nothrow_constructible<gsl::span<int>, int (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<int>, int(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<int>, const gsl::span<int>&>::value, "std::is_nothrow_constructible<gsl::span<int>, const gsl::span<int>&>"); static_assert(std::is_nothrow_constructible<gsl::span<int>, const gsl::span<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<int>, const gsl::span<int, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<int>, const gsl::span<int, 500>&>::value, "std::is_nothrow_constructible<gsl::span<int>, const gsl::span<int, 500>&>"); static_assert(std::is_nothrow_constructible<gsl::span<int>, std::array<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<int>, std::array<int, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<int, 3>, int*, std::size_t>::value, "std::is_nothrow_constructible<gsl::span<int, 3>, int*, std::size_t>"); static_assert(std::is_nothrow_constructible<gsl::span<int, 3>, int*, std::uint16_t>::value, "std::is_nothrow_constructible<gsl::span<int, 3>, int*, std::uint16_t>"); static_assert(std::is_nothrow_constructible<gsl::span<int, 3>, int*, int*>::value, "std::is_nothrow_constructible<gsl::span<int, 3>, int*, int*>"); static_assert(std::is_nothrow_constructible<gsl::span<int, 3>, int (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<int, 3>, int(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<int, 3>, const gsl::span<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<int, 3>, const gsl::span<int, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<int, 3>, std::array<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<int, 3>, std::array<int, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, int*, std::size_t>::value, "std::is_nothrow_constructible<gsl::span<const int>, int*, std::size_t>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, int*, int*>::value, "std::is_nothrow_constructible<gsl::span<const int>, int*, int*>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, int*, const int*>::value, "std::is_nothrow_constructible<gsl::span<const int>, int*, const int*>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, int (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<const int>, int(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, const int*, int*>::value, "std::is_nothrow_constructible<gsl::span<const int>, const int*, int*>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, const int*, const int*>::value, "std::is_nothrow_constructible<gsl::span<const int>, const int*, const int*>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, const int*, std::size_t>::value, "std::is_nothrow_constructible<gsl::span<const int>, const int*, std::size_t>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, const int (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<const int>, const int(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<int>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<int>&>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<int, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<int, 500>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<int, 500>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<const int>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<const int>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<const int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<const int, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<const int, 500>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, const gsl::span<const int, 500>&>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, std::array<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, std::array<int, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<const int>, const std::array<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const int>, const std::array<int, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const int, 3>, const gsl::span<int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const int, 3>, const gsl::span<int, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const int, 3>, const gsl::span<const int, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const int, 3>, const gsl::span<const int, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<Base>, Base (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<Base>, Base(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<Base>, const gsl::span<Base>&>::value, "std::is_nothrow_constructible<gsl::span<Base>, const gsl::span<Base>&>"); static_assert(std::is_nothrow_constructible<gsl::span<Base>, const gsl::span<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<Base>, const gsl::span<Base, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<Base>, std::array<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<Base>, std::array<Base, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<Base, 3>, Base (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<Base, 3>, Base(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<Base, 3>, const gsl::span<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<Base, 3>, const gsl::span<Base, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<Base, 3>, std::array<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<Base, 3>, std::array<Base, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<const Base>, Base (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<const Base>, Base(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<const Base>, const Base (&)[3]>::value, "std::is_nothrow_constructible<gsl::span<const Base>, const Base(&)[3]>"); static_assert(std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<Base>&>::value, "std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<Base>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<Base, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<const Base>&>::value, "std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<const Base>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<const Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const Base>, const gsl::span<const Base, 3>&>"); static_assert(std::is_nothrow_constructible<gsl::span<const Base>, std::array<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const Base>, std::array<Base, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const Base>, const std::array<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const Base>, const std::array<Base, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const Base, 3>, const gsl::span<Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const Base, 3>, const gsl::span<Base, 3>&>"); static_assert( std::is_nothrow_constructible<gsl::span<const Base, 3>, const gsl::span<const Base, 3>&>::value, "std::is_nothrow_constructible<gsl::span<const Base, 3>, const gsl::span<const Base, 3>&>"); // non-constructible assertions static_assert(!std::is_constructible<gsl::span<int>, const int*, int*>::value, "!std::is_constructible<gsl::span<int>, const int*, int*>"); static_assert(!std::is_constructible<gsl::span<int>, const int*, const int*>::value, "!std::is_constructible<gsl::span<int>, const int*, const int*>"); static_assert(!std::is_constructible<gsl::span<int>, const int*, double*>::value, "!std::is_constructible<gsl::span<int>, const int*, double*>"); static_assert(!std::is_constructible<gsl::span<int>, const int*, std::size_t>::value, "!std::is_constructible<gsl::span<int>, const int*, std::size_t>"); static_assert(!std::is_constructible<gsl::span<int>, const int (&)[3]>::value, "!std::is_constructible<gsl::span<int>, const int(&)[3]>"); static_assert(!std::is_constructible<gsl::span<int>, double*, int*>::value, "!std::is_constructible<gsl::span<int>, double*, int*>"); static_assert(!std::is_constructible<gsl::span<int>, double*, const int*>::value, "!std::is_constructible<gsl::span<int>, double*, const int*>"); static_assert(!std::is_constructible<gsl::span<int>, double*, double*>::value, "!std::is_constructible<gsl::span<int>, double*, double*>"); static_assert(!std::is_constructible<gsl::span<int>, double*, std::size_t>::value, "!std::is_constructible<gsl::span<int>, double*, std::size_t>"); static_assert(!std::is_constructible<gsl::span<int>, double (&)[3]>::value, "!std::is_constructible<gsl::span<int>, double(&)[3]>"); static_assert(!std::is_constructible<gsl::span<int>, int*, double*>::value, "!std::is_constructible<gsl::span<int>, int*, double*>"); static_assert(!std::is_constructible<gsl::span<int>, std::size_t, int*>::value, "!std::is_constructible<gsl::span<int>, std::size_t, int*>"); static_assert(!std::is_constructible<gsl::span<int>, std::size_t, std::size_t>::value, "!std::is_constructible<gsl::span<int>, std::size_t, std::size_t>"); static_assert(!std::is_constructible<gsl::span<int>, const gsl::span<const int>&>::value, "!std::is_constructible<gsl::span<int>, const gsl::span<const int>&>"); static_assert(!std::is_constructible<gsl::span<int>, const gsl::span<const int, 3>&>::value, "!std::is_constructible<gsl::span<int>, const gsl::span<const int, 3>&>"); static_assert(!std::is_constructible<gsl::span<int>, const gsl::span<const int, 500>&>::value, "!std::is_constructible<gsl::span<int>, const gsl::span<const int, 500>&>"); static_assert(!std::is_constructible<gsl::span<int>, const gsl::span<double, 3>&>::value, "!std::is_constructible<gsl::span<int>, const gsl::span<double, 3>&>"); static_assert(!std::is_constructible<gsl::span<int>, std::array<double, 3>&>::value, "!std::is_constructible<gsl::span<int>, std::array<double, 3>&>"); static_assert(!std::is_constructible<gsl::span<int>, const std::array<int, 3>&>::value, "!std::is_constructible<gsl::span<int>, const std::array<int, 3>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, int*, double*>::value, "!std::is_constructible<gsl::span<int, 3>, int*, double*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, int (&)[500]>::value, "!std::is_constructible<gsl::span<int, 3>, int(&)[500]>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const int*, int*>::value, "!std::is_constructible<gsl::span<int, 3>, const int*, int*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const int*, const int*>::value, "!std::is_constructible<gsl::span<int, 3>, const int*, const int*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const int*, std::size_t>::value, "!std::is_constructible<gsl::span<int, 3>, const int*, std::size_t>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const int*, double*>::value, "!std::is_constructible<gsl::span<int, 3>, const int*, double*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const int (&)[3]>::value, "!std::is_constructible<gsl::span<int, 3>, const int(&)[3]>"); static_assert(!std::is_constructible<gsl::span<int, 3>, double*, std::size_t>::value, "!std::is_constructible<gsl::span<int, 3>, double*, std::size_t>"); static_assert(!std::is_constructible<gsl::span<int, 3>, double*, int*>::value, "!std::is_constructible<gsl::span<int, 3>, double*, int*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, double*, const int*>::value, "!std::is_constructible<gsl::span<int, 3>, double*, const int*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, double*, double*>::value, "!std::is_constructible<gsl::span<int, 3>, double*, double*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, double (&)[3]>::value, "!std::is_constructible<gsl::span<int, 3>, double(&)[3]>"); static_assert(!std::is_constructible<gsl::span<int, 3>, std::size_t, int*>::value, "!std::is_constructible<gsl::span<int, 3>, std::size_t, int*>"); static_assert(!std::is_constructible<gsl::span<int, 3>, std::size_t, std::size_t>::value, "!std::is_constructible<gsl::span<int, 3>, std::size_t, std::size_t>"); static_assert(!std::is_constructible<gsl::span<int, 3>, std::array<double, 3>&>::value, "!std::is_constructible<gsl::span<int, 3>, std::array<double, 3>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, std::array<int, 500>&>::value, "!std::is_constructible<gsl::span<int, 3>, std::array<int, 500>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const std::array<int, 3>&>::value, "!std::is_constructible<gsl::span<int, 3>, const std::array<int, 3>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<int, 500>&>::value, "!std::is_constructible<gsl::span<int, 3>, const gsl::span<int, 500>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<const int>&>::value, "!std::is_constructible<gsl::span<int, 3>, const gsl::span<const int>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<const int, 3>&>::value, "!std::is_constructible<gsl::span<int, 3>, const gsl::span<const int, 3>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<const int, 500>&>::value, "!std::is_constructible<gsl::span<int, 3>, const gsl::span<const int, 500>&>"); static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<double, 3>&>::value, "!std::is_constructible<gsl::span<int, 3>, const gsl::span<double, 3>&>"); static_assert(!std::is_constructible<gsl::span<const int>, double (&)[3]>::value, "!std::is_constructible<gsl::span<const int>, double(&)[3]>"); static_assert(!std::is_constructible<gsl::span<const int>, std::array<double, 3>&>::value, "!std::is_constructible<gsl::span<const int>, std::array<double, 3>&>"); static_assert(!std::is_constructible<gsl::span<const int>, const gsl::span<double, 3>&>::value, "!std::is_constructible<gsl::span<const int>, const gsl::span<double, 3>&>"); static_assert(!std::is_constructible<gsl::span<const int, 3>, const gsl::span<int, 500>&>::value, "!std::is_constructible<gsl::span<const int, 3>, const gsl::span<int, 500>&>"); static_assert( !std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int, 500>&>::value, "!std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int, 500>&>"); static_assert(!std::is_constructible<gsl::span<const int, 3>, const gsl::span<double, 3>&>::value, "!std::is_constructible<gsl::span<const int, 3>, const gsl::span<double, 3>&>"); static_assert(!std::is_constructible<gsl::span<Base>, Derived (&)[3]>::value, "!std::is_constructible<gsl::span<Base>, Derived(&)[3]>"); static_assert(!std::is_constructible<gsl::span<Base>, std::array<Derived, 3>&>::value, "!std::is_constructible<gsl::span<Base>, std::array<Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<Base>, std::vector<Derived>&>::value, "!std::is_constructible<gsl::span<Base>, std::vector<Derived>&>"); static_assert(!std::is_constructible<gsl::span<Base>, const gsl::span<Derived>&>::value, "!std::is_constructible<gsl::span<Base>, const gsl::span<Derived>&>"); static_assert(!std::is_constructible<gsl::span<Base>, const gsl::span<Derived, 3>&>::value, "!std::is_constructible<gsl::span<Base>, const gsl::span<Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<Base, 3>, const gsl::span<Derived, 3>&>::value, "!std::is_constructible<gsl::span<Base, 3>, const gsl::span<Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<Base, 3>, Derived (&)[3]>::value, "!std::is_constructible<gsl::span<Base, 3>, Derived(&)[3]>"); static_assert(!std::is_constructible<gsl::span<Base, 3>, std::array<Derived, 3>&>::value, "!std::is_constructible<gsl::span<Base, 3>, std::array<Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<const Base>, Derived (&)[3]>::value, "!std::is_constructible<gsl::span<const Base>, Derived(&)[3]>"); static_assert(!std::is_constructible<gsl::span<const Base>, const Derived (&)[3]>::value, "!std::is_constructible<gsl::span<const Base>, const Derived(&)[3]>"); static_assert(!std::is_constructible<gsl::span<const Base>, std::array<Derived, 3>&>::value, "!std::is_constructible<gsl::span<const Base>, std::array<Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<const Base>, const std::array<Derived, 3>&>::value, "!std::is_constructible<gsl::span<const Base>, const std::array<Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<const Base>, const gsl::span<Derived>&>::value, "!std::is_constructible<gsl::span<const Base>, const gsl::span<Derived>&>"); static_assert(!std::is_constructible<gsl::span<const Base>, const gsl::span<Derived, 3>&>::value, "!std::is_constructible<gsl::span<const Base>, const gsl::span<Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<const Base>, const gsl::span<const Derived>&>::value, "!std::is_constructible<gsl::span<const Base>, const gsl::span<const Derived>&>"); static_assert( !std::is_constructible<gsl::span<const Base>, const gsl::span<const Derived, 3>&>::value, "!std::is_constructible<gsl::span<const Base>, const gsl::span<const Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<const Base, 3>, const gsl::span<Derived, 3>&>::value, "!std::is_constructible<gsl::span<const Base, 3>, const gsl::span<Derived, 3>&>"); static_assert( !std::is_constructible<gsl::span<const Base, 3>, const gsl::span<const Derived, 3>&>::value, "!std::is_constructible<gsl::span<const Base, 3>, const gsl::span<const Derived, 3>&>"); static_assert(!std::is_constructible<gsl::span<const Derived>, std::array<Base, 3>&>::value, "!std::is_constructible<gsl::span<const Derived>, std::array<Base, 3>&>"); static_assert(!std::is_constructible<gsl::span<const Derived>, const std::array<Base, 3>&>::value, "!std::is_constructible<gsl::span<const Derived>, const std::array<Base, 3>&>"); // Explicit construction enabled in P1976R2 static_assert(std::is_constructible<gsl::span<int, 3>, const gsl::span<int>&>::value, "std::is_constructible<gsl::span<int, 3>, const gsl::span<int>&>"); static_assert(std::is_constructible<gsl::span<const int, 3>, const gsl::span<int>&>::value, "std::is_constructible<gsl::span<const int, 3>, const gsl::span<int>&>"); static_assert(std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int>&>::value, "std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int>&>"); // no throw copy constructor static_assert(std::is_nothrow_copy_constructible<gsl::span<int>>::value, "std::is_nothrow_copy_constructible<gsl::span<int>>"); static_assert(std::is_nothrow_copy_constructible<gsl::span<int, 3>>::value, "std::is_nothrow_copy_constructible<gsl::span<int, 3>>"); static_assert(std::is_nothrow_copy_constructible<gsl::span<const int>>::value, "std::is_nothrow_copy_constructible<gsl::span<const int>>"); static_assert(std::is_nothrow_copy_constructible<gsl::span<const int, 3>>::value, "std::is_nothrow_copy_constructible<gsl::span<const int, 3>>"); // no throw copy assignment static_assert(std::is_nothrow_copy_assignable<gsl::span<int>>::value, "std::is_nothrow_copy_assignable<gsl::span<int>>"); static_assert(std::is_nothrow_copy_assignable<gsl::span<int, 3>>::value, "std::is_nothrow_copy_assignable<gsl::span<int, 3>>"); static_assert(std::is_nothrow_copy_assignable<gsl::span<const int>>::value, "std::is_nothrow_copy_assignable<gsl::span<const int>>"); static_assert(std::is_nothrow_copy_assignable<gsl::span<const int, 3>>::value, "std::is_nothrow_copy_assignable<gsl::span<const int, 3>>"); // no throw destruction static_assert(std::is_nothrow_destructible<gsl::span<int>>::value, "std::is_nothrow_destructible<gsl::span<int>>"); static_assert(std::is_nothrow_destructible<gsl::span<int, 3>>::value, "std::is_nothrow_destructible<gsl::span<int, 3>>"); static_assert(std::is_nothrow_destructible<gsl::span<const int>>::value, "std::is_nothrow_destructible<gsl::span<const int>>"); // conversions static_assert(std::is_convertible<int (&)[3], gsl::span<int>>::value, "std::is_convertible<int(&)[3], gsl::span<int>>"); static_assert(std::is_convertible<int (&)[3], gsl::span<int, 3>>::value, "std::is_convertible<int(&)[3], gsl::span<int, 3>>"); static_assert(std::is_convertible<int (&)[3], gsl::span<const int>>::value, "std::is_convertible<int(&)[3], gsl::span<const int>>"); static_assert(std::is_convertible<const int (&)[3], gsl::span<const int>>::value, "std::is_convertible<const int(&)[3], gsl::span<const int>>"); static_assert(std::is_convertible<const gsl::span<int>&, gsl::span<int>>::value, "std::is_convertible<const gsl::span<int>&, gsl::span<int>>"); static_assert(std::is_convertible<const gsl::span<int>&, gsl::span<const int>>::value, "std::is_convertible<const gsl::span<int>&, gsl::span<const int>>"); static_assert(std::is_convertible<const gsl::span<int, 3>&, gsl::span<int>>::value, "std::is_convertible<const gsl::span<int, 3>&, gsl::span<int>>"); static_assert(std::is_convertible<const gsl::span<int, 3>&, gsl::span<int, 3>>::value, "std::is_convertible<const gsl::span<int, 3>&, gsl::span<int, 3>>"); static_assert(std::is_convertible<const gsl::span<int, 3>&, gsl::span<const int>>::value, "std::is_convertible<const gsl::span<int, 3>&, gsl::span<const int>>"); static_assert(std::is_convertible<const gsl::span<int, 3>&, gsl::span<const int, 3>>::value, "std::is_convertible<const gsl::span<int, 3>&, gsl::span<const int, 3>>"); static_assert(std::is_convertible<const gsl::span<int, 500>&, gsl::span<int>>::value, "std::is_convertible<const gsl::span<int, 500>&, gsl::span<int>>"); static_assert(std::is_convertible<const gsl::span<int, 500>&, gsl::span<const int>>::value, "std::is_convertible<const gsl::span<int, 500>&, gsl::span<const int>>"); static_assert(std::is_convertible<const gsl::span<const int>&, gsl::span<const int>>::value, "std::is_convertible<const gsl::span<const int>&, gsl::span<const int>>"); static_assert(std::is_convertible<const gsl::span<const int, 3>&, gsl::span<const int>>::value, "std::is_convertible<const gsl::span<const int, 3>&, gsl::span<const int>>"); static_assert(std::is_convertible<const gsl::span<const int, 3>&, gsl::span<const int, 3>>::value, "std::is_convertible<const gsl::span<const int, 3>&, gsl::span<const int, 3>>"); static_assert(std::is_convertible<const gsl::span<const int, 500>&, gsl::span<const int>>::value, "std::is_convertible<const gsl::span<const int, 500>&, gsl::span<const int>>"); static_assert(std::is_convertible<std::array<int, 3>&, gsl::span<int>>::value, "std::is_convertible<std::array<int, 3>&, gsl::span<int>>"); static_assert(std::is_convertible<std::array<int, 3>&, gsl::span<int, 3>>::value, "std::is_convertible<std::array<int, 3>&, gsl::span<int, 3>>"); static_assert(std::is_convertible<std::array<int, 3>&, gsl::span<const int>>::value, "std::is_convertible<std::array<int, 3>&, gsl::span<const int>>"); static_assert(std::is_convertible<const std::array<int, 3>&, gsl::span<const int>>::value, "std::is_convertible<const std::array<int, 3>&, gsl::span<const int>>"); #if __cplusplus >= 201703l template <typename U, typename = void> static constexpr bool AsWritableBytesCompilesFor = false; template <typename U> static constexpr bool AsWritableBytesCompilesFor<U, void_t<decltype(as_writable_bytes(declval<U>()))>> = true; static_assert(AsWritableBytesCompilesFor<gsl::span<int>>, "AsWritableBytesCompilesFor<gsl::span<int>>"); static_assert(AsWritableBytesCompilesFor<gsl::span<int, 9>>, "AsWritableBytesCompilesFor<gsl::span<int, 9>>"); static_assert(!AsWritableBytesCompilesFor<gsl::span<const int>>, "!AsWritableBytesCompilesFor<gsl::span<const int>>"); static_assert(!AsWritableBytesCompilesFor<gsl::span<const int, 9>>, "!AsWritableBytesCompilesFor<gsl::span<const int, 9>>"); #endif // __cplusplus >= 201703l