67 lines
1.9 KiB
C++
67 lines
1.9 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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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// UNSUPPORTED: clang-5, apple-clang-9
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// UNSUPPORTED: libcpp-no-deduction-guides
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// Clang 5 will generate bad implicit deduction guides
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// Specifically, for the copy constructor.
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// template <class T, class... U>
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// array(T, U...) -> array<T, 1 + sizeof...(U)>;
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//
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// Requires: (is_same_v<T, U> && ...) is true. Otherwise the program is ill-formed.
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#include <array>
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#include <cassert>
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#include <cstddef>
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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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#include "test_macros.h"
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int main(int, char**)
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{
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// Test the explicit deduction guides
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{
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std::array arr{1,2,3}; // array(T, U...)
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static_assert(std::is_same_v<decltype(arr), std::array<int, 3>>, "");
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assert(arr[0] == 1);
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assert(arr[1] == 2);
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assert(arr[2] == 3);
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}
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{
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const long l1 = 42;
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std::array arr{1L, 4L, 9L, l1}; // array(T, U...)
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static_assert(std::is_same_v<decltype(arr)::value_type, long>, "");
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static_assert(arr.size() == 4, "");
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assert(arr[0] == 1);
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assert(arr[1] == 4);
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assert(arr[2] == 9);
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assert(arr[3] == l1);
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}
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// Test the implicit deduction guides
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{
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std::array<double, 2> source = {4.0, 5.0};
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std::array arr(source); // array(array)
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static_assert(std::is_same_v<decltype(arr), decltype(source)>, "");
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static_assert(std::is_same_v<decltype(arr), std::array<double, 2>>, "");
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assert(arr[0] == 4.0);
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assert(arr[1] == 5.0);
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}
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return 0;
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}
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