f4c1258d56
Some embedded platforms do not wish to support the C library functionality for handling wchar_t because they have no use for it. It makes sense for libc++ to work properly on those platforms, so this commit adds a carve-out of functionality for wchar_t. Unfortunately, unlike some other carve-outs (e.g. random device), this patch touches several parts of the library. However, despite the wide impact of this patch, I still think it is important to support this configuration since it makes it much simpler to port libc++ to some embedded platforms. Differential Revision: https://reviews.llvm.org/D111265
68 lines
1.8 KiB
C++
68 lines
1.8 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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// <string_view>
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// template<class Allocator>
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// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
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#include <string_view>
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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struct dummy_char_traits : public std::char_traits<char> {};
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template<typename CharT, typename Traits>
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void test ( const std::basic_string<CharT, Traits> &str ) {
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typedef std::basic_string_view<CharT, Traits> SV;
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ASSERT_NOEXCEPT(SV(str));
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SV sv1 ( str );
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assert ( sv1.size() == str.size());
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assert ( sv1.data() == str.data());
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}
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int main(int, char**) {
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test ( std::string("QBCDE") );
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test ( std::string("") );
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test ( std::string() );
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test ( std::wstring(L"QBCDE") );
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test ( std::wstring(L"") );
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test ( std::wstring() );
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#endif
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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test ( std::u8string{u8"QBCDE"} );
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test ( std::u8string{u8""} );
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test ( std::u8string{} );
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#endif
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#if TEST_STD_VER >= 11
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test ( std::u16string{u"QBCDE"} );
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test ( std::u16string{u""} );
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test ( std::u16string{} );
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test ( std::u32string{U"QBCDE"} );
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test ( std::u32string{U""} );
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test ( std::u32string{} );
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#endif
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test ( std::basic_string<char, dummy_char_traits>("QBCDE") );
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test ( std::basic_string<char, dummy_char_traits>("") );
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test ( std::basic_string<char, dummy_char_traits>() );
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return 0;
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}
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