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discussed the issue with Casey Carter, the span ctor changes are accurate but the tests are not. The test require work that was done in C++17 regarding qualifier conversions to work correctly. Scoping tests for 17.

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This commit is contained in:
Jordan Maples 2020-03-17 15:02:00 -07:00
parent 1dd1320c8b
commit 9b3ac8d681
2 changed files with 5 additions and 20 deletions
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19
include/gsl/span
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@ -441,23 +441,6 @@ public:
: storage_(KnownNotNull{arr + 0}, details::extent_type<N>())
{}
// #define useold
#if defined(useold)
template <std::size_t N,
std::enable_if_t<details::is_allowed_extent_conversion<N, Extent>::value, int> = 0>
constexpr span(std::array<element_type, N>& arr) noexcept
: storage_(KnownNotNull{arr.data()}, details::extent_type<N>())
{}
template <std::size_t N,
std::enable_if_t<(details::is_allowed_extent_conversion<N, Extent>::value &&
details::is_allowed_element_type_conversion<const value_type,
element_type>::value),
int> = 0>
constexpr span(const std::array<value_type, N>& arr) noexcept
: storage_(KnownNotNull{arr.data()}, details::extent_type<N>())
{}
#else
template <class T, std::size_t N,
std::enable_if_t<(details::is_allowed_extent_conversion<N, Extent>::value &&
details::is_allowed_element_type_conversion<T, element_type>::value), int> = 0>
@ -473,7 +456,7 @@ public:
constexpr span(const std::array<T, N>& arr) noexcept
: storage_(KnownNotNull{arr.data()}, details::extent_type<N>())
{}
#endif
// NB: the SFINAE here uses .data() as an incomplete/imperfect proxy for the requirement
// on Container to be a contiguous sequence container.
template <class Container,

6
tests/span_compatibility_tests.cpp
View File

@ -48,20 +48,22 @@ TEST(span_compatibility_tests, assertion_tests)
std::array<int, 3> stl{{100, 200, 300}};
std::array<int*, 3> stl_nullptr{{nullptr,nullptr,nullptr}};
#if __cplusplus >= 201703l
// This std::is_convertible_v<int*(*)[], int const* const(*)[]> fails for C++14
// so these conversions aren't valid in C++14
{
gsl::span<const int* 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);
#if __cplusplus >= 201703l
span<const int* 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(span{stl_nullptr}), span<int*, 3>);
static_assert(std::is_same<decltype(span{std::as_const(stl_nullptr)}), span<int* const, 3>);
#endif
}
#endif
{
gsl::span<int> sp_dyn;