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> const Facet& use_facet(const locale& loc); 13 14 #include <locale> 15 #include <cassert> 16 17 int facet_count = 0; 18 19 struct my_facet 20 : public std::locale::facet 21 { 22 static std::locale::id id; 23 24 bool im_alive; 25 26 my_facet() : im_alive(true) {++facet_count;} 27 ~my_facet() {im_alive = false; --facet_count;} 28 }; 29 30 std::locale::id my_facet::id; 31 32 int main() 33 { 34 try 35 { 36 const my_facet& f = std::use_facet<my_facet>(std::locale()); 37 assert(false); 38 } 39 catch (std::bad_cast&) 40 { 41 } 42 const my_facet* fp = 0; 43 { 44 std::locale loc(std::locale(), new my_facet); 45 const my_facet& f = std::use_facet<my_facet>(loc); 46 assert(f.im_alive); 47 fp = &f; 48 assert(fp->im_alive); 49 assert(facet_count == 1); 50 } 51 assert(facet_count == 0); 52 } 53
