100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <array>
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// T *data();
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#include <array>
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#include <cassert>
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#include <cstddef> // for std::max_align_t
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#include "test_macros.h"
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// std::array is explicitly allowed to be initialized with A a = { init-list };.
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// Disable the missing braces warning for this reason.
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#include "disable_missing_braces_warning.h"
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struct NoDefault {
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TEST_CONSTEXPR NoDefault(int) { }
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};
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#if TEST_STD_VER < 11
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struct natural_alignment {
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long t1;
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long long t2;
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double t3;
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long double t4;
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};
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#endif
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TEST_CONSTEXPR_CXX17 bool tests()
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{
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{
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typedef double T;
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typedef std::array<T, 3> C;
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C c = {1, 2, 3.5};
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T* p = c.data();
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assert(p[0] == 1);
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assert(p[1] == 2);
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assert(p[2] == 3.5);
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}
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{
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typedef double T;
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typedef std::array<T, 0> C;
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C c = {};
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T* p = c.data();
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(void)p;
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}
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{
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typedef double T;
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typedef std::array<const T, 0> C;
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C c = {{}};
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const T* p = c.data();
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(void)p;
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static_assert((std::is_same<decltype(c.data()), const T*>::value), "");
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}
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{
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typedef NoDefault T;
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typedef std::array<T, 0> C;
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C c = {};
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T* p = c.data();
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(void)p;
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}
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{
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std::array<int, 5> c = {0, 1, 2, 3, 4};
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assert(c.data() == &c[0]);
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assert(*c.data() == c[0]);
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}
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return true;
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}
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int main(int, char**)
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{
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tests();
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#if TEST_STD_VER >= 17
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static_assert(tests(), "");
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#endif
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// Test the alignment of data()
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{
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#if TEST_STD_VER < 11
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typedef natural_alignment T;
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#else
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typedef std::max_align_t T;
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#endif
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typedef std::array<T, 0> C;
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const C c = {};
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const T* p = c.data();
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std::uintptr_t pint = reinterpret_cast<std::uintptr_t>(p);
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assert(pint % TEST_ALIGNOF(T) == 0);
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}
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return 0;
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}
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