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 21bool is5 ( int i ) { return i == 5; } 22 23template <typename T> 24bool call_pred ( T pred ) { return pred(5); } 25 26int 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