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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<wchar_t>
// static char_type* copy(char_type* s1, const char_type* s2, size_t n);
#include <string>
#include <cassert>
int main()
{
wchar_t s1[] = {1, 2, 3};
wchar_t s2[3] = {0};
assert(std::char_traits<wchar_t>::copy(s2, s1, 3) == s2);
assert(s2[0] == wchar_t(1));
assert(s2[1] == wchar_t(2));
assert(s2[2] == wchar_t(3));
assert(std::char_traits<wchar_t>::copy(NULL, s1, 0) == NULL);
assert(std::char_traits<wchar_t>::copy(s1, NULL, 0) == s1);
}
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