91 lines
2.3 KiB
C++
91 lines
2.3 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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// UNSUPPORTED: c++03, c++11, c++14
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// <iterator>
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// template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17
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// template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17
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// template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17
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#include <iterator>
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#include <cassert>
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#include <vector>
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#include <array>
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#include <list>
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#include <initializer_list>
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#include "test_macros.h"
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#if TEST_STD_VER > 14
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#include <string_view>
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#endif
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template<typename C>
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void test_const_container( const C& c )
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{
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// Can't say noexcept here because the container might not be
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assert ( std::empty(c) == c.empty());
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}
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template<typename T>
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void test_const_container( const std::initializer_list<T>& c )
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{
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assert ( std::empty(c) == (c.size() == 0));
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}
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template<typename C>
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void test_container( C& c )
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{
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// Can't say noexcept here because the container might not be
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assert ( std::empty(c) == c.empty());
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}
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template<typename T>
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void test_container( std::initializer_list<T>& c )
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{
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ASSERT_NOEXCEPT(std::empty(c));
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assert ( std::empty(c) == (c.size() == 0));
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}
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template<typename T, size_t Sz>
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void test_const_array( const T (&array)[Sz] )
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{
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ASSERT_NOEXCEPT(std::empty(array));
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assert (!std::empty(array));
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}
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int main(int, char**)
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{
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std::vector<int> v; v.push_back(1);
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std::list<int> l; l.push_back(2);
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std::array<int, 1> a; a[0] = 3;
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std::initializer_list<int> il = { 4 };
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test_container ( v );
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test_container ( l );
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test_container ( a );
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test_container ( il );
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test_const_container ( v );
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test_const_container ( l );
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test_const_container ( a );
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test_const_container ( il );
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#if TEST_STD_VER > 14
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std::string_view sv{"ABC"};
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test_container ( sv );
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test_const_container ( sv );
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#endif
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static constexpr int arrA [] { 1, 2, 3 };
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test_const_array ( arrA );
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return 0;
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}
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