46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <string>
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// basic_string()
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// noexcept(is_nothrow_default_constructible<allocator_type>::value);
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// This tests a conforming extension
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#include <string>
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#include <cassert>
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#include "../test_allocator.h"
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template <class T>
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struct some_alloc
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{
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typedef T value_type;
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some_alloc(const some_alloc&);
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};
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int main()
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{
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#if __has_feature(cxx_noexcept)
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{
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typedef std::string C;
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static_assert(std::is_nothrow_default_constructible<C>::value, "");
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}
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{
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typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C;
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static_assert(std::is_nothrow_default_constructible<C>::value, "");
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}
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{
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typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C;
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static_assert(!std::is_nothrow_default_constructible<C>::value, "");
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}
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#endif
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}
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