| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <string> |
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| 10 | |
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| 11 | // template<> struct char_traits<wchar_t> |
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| 12 | |
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| 13 | // static size_t length(const char_type* s); |
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| 14 | // constexpr in C++17 |
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| 15 | |
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| 16 | // UNSUPPORTED: no-wide-characters |
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| 17 | |
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| 18 | #include <string> |
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| 19 | #include <cassert> |
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| 20 | |
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| 21 | #include "test_macros.h" |
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| 22 | |
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| 23 | #if TEST_STD_VER > 14 |
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| 24 | constexpr bool test_constexpr() { |
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| 25 | return std::char_traits<wchar_t>::length(L"" ) == 0 && std::char_traits<wchar_t>::length(L"abcd" ) == 4; |
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| 26 | } |
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| 27 | #endif |
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| 28 | |
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| 29 | int main(int, char**) { |
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| 30 | assert(std::char_traits<wchar_t>::length(L"" ) == 0); |
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| 31 | assert(std::char_traits<wchar_t>::length(L"a" ) == 1); |
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| 32 | assert(std::char_traits<wchar_t>::length(L"aa" ) == 2); |
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| 33 | assert(std::char_traits<wchar_t>::length(L"aaa" ) == 3); |
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| 34 | assert(std::char_traits<wchar_t>::length(L"aaaa" ) == 4); |
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| 35 | |
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| 36 | #if TEST_STD_VER > 14 |
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| 37 | static_assert(test_constexpr(), "" ); |
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| 38 | #endif |
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| 39 | |
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| 40 | return 0; |
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| 41 | } |
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| 42 | |
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