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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <array>
// T *data();
#include <array>
#include <cassert>
#include <cstddef> // for std::max_align_t
#include "test_macros.h"
// std::array is explicitly allowed to be initialized with A a = { init-list };.
// Disable the missing braces warning for this reason.
#include "disable_missing_braces_warning.h"
struct NoDefault {
TEST_CONSTEXPR NoDefault(int) { }
};
#if TEST_STD_VER < 11
struct natural_alignment {
long t1;
long long t2;
double t3;
long double t4;
};
#endif
TEST_CONSTEXPR_CXX17 bool tests()
{
{
typedef double T;
typedef std::array<T, 3> C;
C c = {1, 2, 3.5};
T* p = c.data();
assert(p[0] == 1);
assert(p[1] == 2);
assert(p[2] == 3.5);
}
{
typedef double T;
typedef std::array<T, 0> C;
C c = {};
T* p = c.data();
(void)p;
}
{
typedef double T;
typedef std::array<const T, 0> C;
C c = {{}};
const T* p = c.data();
(void)p;
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();
(void)p;
}
{
std::array<int, 5> c = {0, 1, 2, 3, 4};
assert(c.data() == &c[0]);
assert(*c.data() == c[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();
std::uintptr_t pint = reinterpret_cast<std::uintptr_t>(p);
assert(pint % TEST_ALIGNOF(T) == 0);
}
return 0;
}
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