forked from OSchip/llvm-project
129 lines
3.6 KiB
C++
129 lines
3.6 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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// reference front(); // constexpr in C++17
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// reference back(); // constexpr in C++17
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// const_reference front(); // constexpr in C++14
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// const_reference back(); // constexpr in C++14
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#include <array>
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#include <cassert>
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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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#if TEST_STD_VER > 14
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constexpr bool check_front( double val )
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{
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std::array<double, 3> arr = {1, 2, 3.5};
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return arr.front() == val;
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}
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constexpr bool check_back( double val )
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{
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std::array<double, 3> arr = {1, 2, 3.5};
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return arr.back() == val;
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}
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#endif
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int main(int, char**)
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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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C::reference r1 = c.front();
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assert(r1 == 1);
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r1 = 5.5;
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assert(c[0] == 5.5);
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C::reference r2 = c.back();
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assert(r2 == 3.5);
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r2 = 7.5;
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assert(c[2] == 7.5);
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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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const C c = {1, 2, 3.5};
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C::const_reference r1 = c.front();
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assert(r1 == 1);
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C::const_reference r2 = c.back();
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assert(r2 == 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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C const& cc = c;
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ASSERT_SAME_TYPE(decltype( c.back()), typename C::reference);
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ASSERT_SAME_TYPE(decltype(cc.back()), typename C::const_reference);
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LIBCPP_ASSERT_NOEXCEPT( c.back());
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LIBCPP_ASSERT_NOEXCEPT( cc.back());
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ASSERT_SAME_TYPE(decltype( c.front()), typename C::reference);
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ASSERT_SAME_TYPE(decltype(cc.front()), typename C::const_reference);
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LIBCPP_ASSERT_NOEXCEPT( c.front());
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LIBCPP_ASSERT_NOEXCEPT( cc.front());
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if (c.size() > (0)) { // always false
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TEST_IGNORE_NODISCARD c.front();
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TEST_IGNORE_NODISCARD c.back();
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TEST_IGNORE_NODISCARD cc.front();
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TEST_IGNORE_NODISCARD cc.back();
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}
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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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C const& cc = c;
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ASSERT_SAME_TYPE(decltype( c.back()), typename C::reference);
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ASSERT_SAME_TYPE(decltype(cc.back()), typename C::const_reference);
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LIBCPP_ASSERT_NOEXCEPT( c.back());
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LIBCPP_ASSERT_NOEXCEPT( cc.back());
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ASSERT_SAME_TYPE(decltype( c.front()), typename C::reference);
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ASSERT_SAME_TYPE(decltype(cc.front()), typename C::const_reference);
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LIBCPP_ASSERT_NOEXCEPT( c.front());
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LIBCPP_ASSERT_NOEXCEPT( cc.front());
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if (c.size() > (0)) {
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TEST_IGNORE_NODISCARD c.front();
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TEST_IGNORE_NODISCARD c.back();
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TEST_IGNORE_NODISCARD cc.front();
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TEST_IGNORE_NODISCARD cc.back();
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}
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}
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#if TEST_STD_VER > 11
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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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constexpr C c = {1, 2, 3.5};
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constexpr T t1 = c.front();
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static_assert (t1 == 1, "");
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constexpr T t2 = c.back();
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static_assert (t2 == 3.5, "");
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}
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#endif
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#if TEST_STD_VER > 14
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{
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static_assert (check_front(1), "");
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static_assert (check_back (3.5), "");
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}
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#endif
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return 0;
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}
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