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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
2.9 KiB
C++
108 lines
2.9 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 operator[] (size_type)
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// const_reference operator[] (size_type); // constexpr in C++14
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// reference at (size_type)
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// const_reference at (size_type); // 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_idx( size_t idx, 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[idx] == val;
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}
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#endif
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int main()
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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[0];
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assert(r1 == 1);
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r1 = 5.5;
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assert(c.front() == 5.5);
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C::reference r2 = c[2];
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assert(r2 == 3.5);
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r2 = 7.5;
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assert(c.back() == 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[0];
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assert(r1 == 1);
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C::const_reference r2 = c[2];
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assert(r2 == 3.5);
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}
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{ // Test operator[] "works" on zero sized arrays
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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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static_assert((std::is_same<decltype(c[0]), T &>::value), "");
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static_assert((std::is_same<decltype(cc[0]), const T &>::value), "");
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if (c.size() > (0)) { // always false
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C::reference r1 = c[0];
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C::const_reference r2 = cc[0];
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((void)r1);
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((void)r2);
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}
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}
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{ // Test operator[] "works" on zero sized arrays
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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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static_assert((std::is_same<decltype(c[0]), const T &>::value), "");
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static_assert((std::is_same<decltype(cc[0]), const T &>::value), "");
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if (c.size() > (0)) { // always false
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C::reference r1 = c[0];
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C::const_reference r2 = cc[0];
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((void)r1);
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((void)r2);
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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[0];
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static_assert (t1 == 1, "");
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constexpr T t2 = c[2];
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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_idx(0, 1), "");
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static_assert (check_idx(1, 2), "");
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static_assert (check_idx(2, 3.5), "");
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}
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#endif
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}
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