1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // UNSUPPORTED: c++98, c++03 11 12 // <string> 13 14 // basic_string() 15 // noexcept(is_nothrow_default_constructible<allocator_type>::value); 16 17 // This tests a conforming extension 18 19 #include <string> 20 #include <cassert> 21 22 #include "test_macros.h" 23 #include "test_allocator.h" 24 25 template <class T> 26 struct some_alloc 27 { 28 typedef T value_type; 29 some_alloc(const some_alloc&); 30 }; 31 main()32int main() 33 { 34 { 35 typedef std::string C; 36 static_assert(std::is_nothrow_default_constructible<C>::value, ""); 37 } 38 { 39 typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C; 40 static_assert(std::is_nothrow_default_constructible<C>::value, ""); 41 } 42 { 43 typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C; 44 static_assert(!std::is_nothrow_default_constructible<C>::value, ""); 45 } 46 } 47