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 // <functional> 11 12 // reference_wrapper 13 14 // template <ObjectType T> reference_wrapper<T> ref(reference_wrapper<T>t); 15 16 #include <functional> 17 #include <cassert> 18 19 #include "counting_predicates.hpp" 20 21 bool is5 ( int i ) { return i == 5; } 22 23 template <typename T> 24 bool call_pred ( T pred ) { return pred(5); } 25 26 int main() 27 { 28 { 29 int i = 0; 30 std::reference_wrapper<int> r1 = std::ref(i); 31 std::reference_wrapper<int> r2 = std::ref(r1); 32 assert(&r2.get() == &i); 33 } 34 { 35 unary_counting_predicate<bool(*)(int), int> cp(is5); 36 assert(!cp(6)); 37 assert(cp.count() == 1); 38 assert(call_pred(cp)); 39 assert(cp.count() == 1); 40 assert(call_pred(std::ref(cp))); 41 assert(cp.count() == 2); 42 } 43 } 44
