empty.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <iterator>
// template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17
// template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17
// template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17
#include <iterator>
#include <cassert>
#include <vector>
#include <array>
#include <list>
#include <initializer_list>
#include "test_macros.h"
#if TEST_STD_VER > 14
#include <string_view>
#endif
template<typename C>
void test_const_container( const C& c )
{
// Can't say noexcept here because the container might not be
assert ( std::empty(c) == c.empty());
}
template<typename T>
void test_const_container( const std::initializer_list<T>& c )
{
assert ( std::empty(c) == (c.size() == 0));
}
template<typename C>
void test_container( C& c )
{
// Can't say noexcept here because the container might not be
assert ( std::empty(c) == c.empty());
}
template<typename T>
void test_container( std::initializer_list<T>& c )
{
ASSERT_NOEXCEPT(std::empty(c));
assert ( std::empty(c) == (c.size() == 0));
}
template<typename T, size_t Sz>
void test_const_array( const T (&array)[Sz] )
{
ASSERT_NOEXCEPT(std::empty(array));
assert (!std::empty(array));
}
int main(int, char**)
{
std::vector<int> v; v.push_back(1);
std::list<int> l; l.push_back(2);
std::array<int, 1> a; a[0] = 3;
std::initializer_list<int> il = { 4 };
test_container ( v );
test_container ( l );
test_container ( a );
test_container ( il );
test_const_container ( v );
test_const_container ( l );
test_const_container ( a );
test_const_container ( il );
#if TEST_STD_VER > 14
std::string_view sv{"ABC"};
test_container ( sv );
test_const_container ( sv );
#endif
static constexpr int arrA [] { 1, 2, 3 };
test_const_array ( arrA );
return 0;
}