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 // <locale>
11 
12 // template <class Facet> bool has_facet(const locale& loc) throw();
13 
14 #include <locale>
15 #include <cassert>
16 
17 struct my_facet
18     : public std::locale::facet
19 {
20     static std::locale::id id;
21 };
22 
23 std::locale::id my_facet::id;
24 
main()25 int main()
26 {
27     std::locale loc;
28     assert(std::has_facet<std::ctype<char> >(loc));
29     assert(!std::has_facet<my_facet>(loc));
30     std::locale loc2(loc, new my_facet);
31     assert(std::has_facet<my_facet>(loc2));
32 }
33