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[libc++] Complete overhaul of constexpr support in std::array

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This commit adds missing support for constexpr in std::array under all
standard modes up to and including C++20. It also transforms the <array>
tests to check for constexpr-friendliness under the right standard modes.

Fixes https://llvm.org/PR40124
Fixes rdar://57522096
Supersedes https://reviews.llvm.org/D60666

Differential Revision: https://reviews.llvm.org/D80452
This commit is contained in:
Louis Dionne
2020-05-22 09:59:48 -04:00
parent b726d071b4
commit 77b9abfc8e
38 changed files with 1196 additions and 825 deletions
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70
libcxx/test/std/containers/sequences/array/array.data/data.pass.cpp
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@@ -21,7 +21,7 @@
#include "disable_missing_braces_warning.h"
struct NoDefault {
NoDefault(int) {}
TEST_CONSTEXPR NoDefault(int) { }
};
#if TEST_STD_VER < 11
@@ -33,7 +33,7 @@ struct natural_alignment {
};
#endif
int main(int, char**)
TEST_CONSTEXPR_CXX17 bool tests()
{
{
typedef double T;
@@ -52,33 +52,49 @@ int main(int, char**)
LIBCPP_ASSERT(p != nullptr);
}
{
typedef double T;
typedef std::array<const T, 0> C;
C c = {{}};
const T* p = c.data();
static_assert((std::is_same<decltype(c.data()), const T*>::value), "");
LIBCPP_ASSERT(p != nullptr);
}
{
#if TEST_STD_VER < 11
typedef natural_alignment T;
#else
typedef std::max_align_t T;
#endif
typedef std::array<T, 0> C;
const C c = {};
const T* p = c.data();
LIBCPP_ASSERT(p != nullptr);
std::uintptr_t pint = reinterpret_cast<std::uintptr_t>(p);
assert(pint % TEST_ALIGNOF(T) == 0);
typedef double T;
typedef std::array<const T, 0> C;
C c = {{}};
const T* p = c.data();
LIBCPP_ASSERT(p != nullptr);
static_assert((std::is_same<decltype(c.data()), const T*>::value), "");
}
{
typedef NoDefault T;
typedef std::array<T, 0> C;
C c = {};
T* p = c.data();
LIBCPP_ASSERT(p != nullptr);
typedef NoDefault T;
typedef std::array<T, 0> C;
C c = {};
T* p = c.data();
LIBCPP_ASSERT(p != nullptr);
}
{
std::array<int, 5> c = {0, 1, 2, 3, 4};
assert(c.data() == &c[0]);
assert(*c.data() == c[0]);
}
return 0;
return true;
}
int main(int, char**)
{
tests();
#if TEST_STD_VER >= 17
static_assert(tests(), "");
#endif
// Test the alignment of data()
{
#if TEST_STD_VER < 11
typedef natural_alignment T;
#else
typedef std::max_align_t T;
#endif
typedef std::array<T, 0> C;
const C c = {};
const T* p = c.data();
LIBCPP_ASSERT(p != nullptr);
std::uintptr_t pint = reinterpret_cast<std::uintptr_t>(p);
assert(pint % TEST_ALIGNOF(T) == 0);
}
return 0;
}