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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
//
//===----------------------------------------------------------------------===//
// <string>
// template<> struct char_traits<char>
// static const char_type* find(const char_type* s, size_t n, const char_type& a);
// constexpr in C++17
#include <string>
#include <cassert>
#include "test_macros.h"
#if TEST_STD_VER > 14
constexpr bool test_constexpr()
{
constexpr const char *p = "123";
return std::char_traits<char>::find(p, 3, '1') == p
&& std::char_traits<char>::find(p, 3, '2') == p + 1
&& std::char_traits<char>::find(p, 3, '3') == p + 2
&& std::char_traits<char>::find(p, 3, '4') == nullptr;
}
#endif
int main(int, char**)
{
char s1[] = {1, 2, 3};
assert(std::char_traits<char>::find(s1, 3, char(1)) == s1);
assert(std::char_traits<char>::find(s1, 3, char(2)) == s1+1);
assert(std::char_traits<char>::find(s1, 3, char(3)) == s1+2);
assert(std::char_traits<char>::find(s1, 3, char(4)) == 0);
assert(std::char_traits<char>::find(s1, 3, char(0)) == 0);
assert(std::char_traits<char>::find(NULL, 0, char(0)) == 0);
#if TEST_STD_VER > 14
static_assert(test_constexpr(), "" );
#endif
return 0;
}
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