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330 lines
10 KiB
C++
330 lines
10 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <catch/catch.hpp> // for AssertionHandler, StringRef, CHECK, TEST_...
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#include <gsl/pointers> // for not_null, operator<, operator<=, operator>
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#include <algorithm> // for addressof
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#include <memory> // for shared_ptr, make_shared, operator<, opera...
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#include <sstream> // for operator<<, ostringstream, basic_ostream:...
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#include <stdint.h> // for uint16_t
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#include <string> // for basic_string, operator==, string, operator<<
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#include <typeinfo> // for type_info
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namespace gsl {
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struct fail_fast;
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} // namespace gsl
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using namespace gsl;
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struct MyBase
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{
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};
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struct MyDerived : public MyBase
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{
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};
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struct Unrelated
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{
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};
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// stand-in for a user-defined ref-counted class
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template <typename T>
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struct RefCounted
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{
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RefCounted(T* p) : p_(p) {}
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operator T*() { return p_; }
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T* p_;
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};
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// user defined smart pointer with comparison operators returning non bool value
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template <typename T>
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struct CustomPtr
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{
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CustomPtr(T* p) : p_(p) {}
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operator T*() { return p_; }
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bool operator!=(std::nullptr_t) const { return p_ != nullptr; }
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T* p_ = nullptr;
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};
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template <typename T, typename U>
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std::string operator==(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) == reinterpret_cast<const void*>(rhs.p_) ? "true"
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: "false";
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}
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template <typename T, typename U>
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std::string operator!=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) != reinterpret_cast<const void*>(rhs.p_) ? "true"
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: "false";
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}
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template <typename T, typename U>
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std::string operator<(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) < reinterpret_cast<const void*>(rhs.p_) ? "true"
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: "false";
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}
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template <typename T, typename U>
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std::string operator>(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) > reinterpret_cast<const void*>(rhs.p_) ? "true"
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: "false";
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}
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template <typename T, typename U>
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std::string operator<=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) <= reinterpret_cast<const void*>(rhs.p_) ? "true"
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: "false";
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}
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template <typename T, typename U>
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std::string operator>=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) >= reinterpret_cast<const void*>(rhs.p_) ? "true"
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: "false";
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}
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struct NonCopyableNonMovable
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{
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NonCopyableNonMovable() = default;
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NonCopyableNonMovable(const NonCopyableNonMovable&) = delete;
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NonCopyableNonMovable& operator=(const NonCopyableNonMovable&) = delete;
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NonCopyableNonMovable(NonCopyableNonMovable&&) = delete;
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NonCopyableNonMovable& operator=(NonCopyableNonMovable&&) = delete;
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};
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bool helper(not_null<int*> p) { return *p == 12; }
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TEST_CASE("TestNotNullConstructors")
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{
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#ifdef CONFIRM_COMPILATION_ERRORS
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not_null<int*> p = nullptr; // yay...does not compile!
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not_null<std::vector<char>*> p = 0; // yay...does not compile!
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not_null<int*> p; // yay...does not compile!
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std::unique_ptr<int> up = std::make_unique<int>(120);
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not_null<int*> p = up;
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// Forbid non-nullptr assignable types
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not_null<std::vector<int>> f(std::vector<int>{1});
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not_null<int> z(10);
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not_null<std::vector<int>> y({1, 2});
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#endif
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int i = 12;
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auto rp = RefCounted<int>(&i);
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not_null<int*> p(rp);
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CHECK(p.get() == &i);
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not_null<std::shared_ptr<int>> x(
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std::make_shared<int>(10)); // shared_ptr<int> is nullptr assignable
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#ifdef GSL_THROW_ON_CONTRACT_VIOLATION
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int* pi = nullptr;
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CHECK_THROWS_AS(not_null<decltype(pi)>(pi), fail_fast);
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#endif
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}
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template<typename T>
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void ostream_helper(T v)
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{
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not_null<T*> p(&v);
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{
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std::ostringstream os;
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std::ostringstream ref;
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os << p;
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ref << &v;
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CHECK(os.str() == ref.str());
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}
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{
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std::ostringstream os;
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std::ostringstream ref;
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os << *p;
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ref << v;
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CHECK(os.str() == ref.str());
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}
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}
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TEST_CASE("TestNotNullostream")
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{
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ostream_helper<int>(17);
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ostream_helper<float>(21.5f);
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ostream_helper<double>(3.4566e-7f);
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ostream_helper<char>('c');
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ostream_helper<uint16_t>(0x0123u);
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ostream_helper<const char*>("cstring");
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ostream_helper<std::string>("string");
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}
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TEST_CASE("TestNotNullCasting")
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{
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MyBase base;
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MyDerived derived;
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Unrelated unrelated;
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not_null<Unrelated*> u = &unrelated;
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(void) u;
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not_null<MyDerived*> p = &derived;
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not_null<MyBase*> q = &base;
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q = p; // allowed with heterogeneous copy ctor
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CHECK(q == p);
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#ifdef CONFIRM_COMPILATION_ERRORS
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q = u; // no viable conversion possible between MyBase* and Unrelated*
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p = q; // not possible to implicitly convert MyBase* to MyDerived*
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not_null<Unrelated*> r = p;
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not_null<Unrelated*> s = reinterpret_cast<Unrelated*>(p);
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#endif
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not_null<Unrelated*> t = reinterpret_cast<Unrelated*>(p.get());
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CHECK(reinterpret_cast<void*>(p.get()) == reinterpret_cast<void*>(t.get()));
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}
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TEST_CASE("TestNotNullAssignment")
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{
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int i = 12;
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not_null<int*> p = &i;
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CHECK(helper(p));
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int* q = nullptr;
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CHECK_THROWS_AS(p = q, fail_fast);
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}
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TEST_CASE("TestNotNullRawPointerComparison")
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{
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int ints[2] = {42, 43};
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int* p1 = &ints[0];
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const int* p2 = &ints[1];
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using NotNull1 = not_null<decltype(p1)>;
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using NotNull2 = not_null<decltype(p2)>;
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CHECK((NotNull1(p1) == NotNull1(p1)) == true);
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CHECK((NotNull1(p1) == NotNull2(p2)) == false);
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CHECK((NotNull1(p1) != NotNull1(p1)) == false);
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CHECK((NotNull1(p1) != NotNull2(p2)) == true);
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CHECK((NotNull1(p1) < NotNull1(p1)) == false);
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CHECK((NotNull1(p1) < NotNull2(p2)) == (p1 < p2));
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CHECK((NotNull2(p2) < NotNull1(p1)) == (p2 < p1));
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CHECK((NotNull1(p1) > NotNull1(p1)) == false);
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CHECK((NotNull1(p1) > NotNull2(p2)) == (p1 > p2));
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CHECK((NotNull2(p2) > NotNull1(p1)) == (p2 > p1));
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CHECK((NotNull1(p1) <= NotNull1(p1)) == true);
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CHECK((NotNull1(p1) <= NotNull2(p2)) == (p1 <= p2));
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CHECK((NotNull2(p2) <= NotNull1(p1)) == (p2 <= p1));
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}
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TEST_CASE("TestNotNullDereferenceOperator")
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{
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{
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auto sp1 = std::make_shared<NonCopyableNonMovable>();
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using NotNullSp1 = not_null<decltype(sp1)>;
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CHECK(typeid(*sp1) == typeid(*NotNullSp1(sp1)));
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CHECK(std::addressof(*NotNullSp1(sp1)) == std::addressof(*sp1));
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}
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{
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int ints[1] = { 42 };
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CustomPtr<int> p1(&ints[0]);
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using NotNull1 = not_null<decltype(p1)>;
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CHECK(typeid(*NotNull1(p1)) == typeid(*p1));
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CHECK(*NotNull1(p1) == 42);
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*NotNull1(p1) = 43;
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CHECK(ints[0] == 43);
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}
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{
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int v = 42;
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gsl::not_null<int*> p(&v);
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CHECK(typeid(*p) == typeid(*(&v)));
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*p = 43;
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CHECK(v == 43);
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}
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}
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TEST_CASE("TestNotNullSharedPtrComparison")
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{
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auto sp1 = std::make_shared<int>(42);
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auto sp2 = std::make_shared<const int>(43);
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using NotNullSp1 = not_null<decltype(sp1)>;
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using NotNullSp2 = not_null<decltype(sp2)>;
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CHECK((NotNullSp1(sp1) == NotNullSp1(sp1)) == true);
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CHECK((NotNullSp1(sp1) == NotNullSp2(sp2)) == false);
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CHECK((NotNullSp1(sp1) != NotNullSp1(sp1)) == false);
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CHECK((NotNullSp1(sp1) != NotNullSp2(sp2)) == true);
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CHECK((NotNullSp1(sp1) < NotNullSp1(sp1)) == false);
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CHECK((NotNullSp1(sp1) < NotNullSp2(sp2)) == (sp1 < sp2));
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CHECK((NotNullSp2(sp2) < NotNullSp1(sp1)) == (sp2 < sp1));
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CHECK((NotNullSp1(sp1) > NotNullSp1(sp1)) == false);
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CHECK((NotNullSp1(sp1) > NotNullSp2(sp2)) == (sp1 > sp2));
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CHECK((NotNullSp2(sp2) > NotNullSp1(sp1)) == (sp2 > sp1));
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CHECK((NotNullSp1(sp1) <= NotNullSp1(sp1)) == true);
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CHECK((NotNullSp1(sp1) <= NotNullSp2(sp2)) == (sp1 <= sp2));
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CHECK((NotNullSp2(sp2) <= NotNullSp1(sp1)) == (sp2 <= sp1));
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CHECK((NotNullSp1(sp1) >= NotNullSp1(sp1)) == true);
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CHECK((NotNullSp1(sp1) >= NotNullSp2(sp2)) == (sp1 >= sp2));
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CHECK((NotNullSp2(sp2) >= NotNullSp1(sp1)) == (sp2 >= sp1));
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}
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TEST_CASE("TestNotNullCustomPtrComparison")
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{
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int ints[2] = {42, 43};
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CustomPtr<int> p1(&ints[0]);
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CustomPtr<const int> p2(&ints[1]);
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using NotNull1 = not_null<decltype(p1)>;
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using NotNull2 = not_null<decltype(p2)>;
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CHECK((NotNull1(p1) == NotNull1(p1)) == "true");
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CHECK((NotNull1(p1) == NotNull2(p2)) == "false");
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CHECK((NotNull1(p1) != NotNull1(p1)) == "false");
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CHECK((NotNull1(p1) != NotNull2(p2)) == "true");
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CHECK((NotNull1(p1) < NotNull1(p1)) == "false");
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CHECK((NotNull1(p1) < NotNull2(p2)) == (p1 < p2));
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CHECK((NotNull2(p2) < NotNull1(p1)) == (p2 < p1));
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CHECK((NotNull1(p1) > NotNull1(p1)) == "false");
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CHECK((NotNull1(p1) > NotNull2(p2)) == (p1 > p2));
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CHECK((NotNull2(p2) > NotNull1(p1)) == (p2 > p1));
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CHECK((NotNull1(p1) <= NotNull1(p1)) == "true");
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CHECK((NotNull1(p1) <= NotNull2(p2)) == (p1 <= p2));
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CHECK((NotNull2(p2) <= NotNull1(p1)) == (p2 <= p1));
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CHECK((NotNull1(p1) >= NotNull1(p1)) == "true");
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CHECK((NotNull1(p1) >= NotNull2(p2)) == (p1 >= p2));
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CHECK((NotNull2(p2) >= NotNull1(p1)) == (p2 >= p1));
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}
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