1 2 // Copyright (C) 2009-2012 Lorenzo Caminiti 3 // Distributed under the Boost Software License, Version 1.0 4 // (see accompanying file LICENSE_1_0.txt or a copy at 5 // http://www.boost.org/LICENSE_1_0.txt) 6 // Home at http://www.boost.org/libs/local_function 7 8 #include <boost/local_function.hpp> 9 #include <boost/typeof/typeof.hpp> 10 #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP() 11 #include <iostream> 12 #include <cassert> 13 14 //[expensive_copy_local_function 15 struct n { 16 int i; nn17 n(int _i): i(_i) {} nn18 n(n const& x): i(x.i) { // Some time consuming copy operation. 19 for (unsigned i = 0; i < 10000; ++i) std::cout << '.'; 20 } 21 }; BOOST_TYPEOF_REGISTER_TYPE(n)22BOOST_TYPEOF_REGISTER_TYPE(n) // Register for `bind& x` below. 23 24 int main(void) { 25 n x(-1); 26 27 void BOOST_LOCAL_FUNCTION(const bind& x) { // OK: No copy expensive 28 assert(x.i == -1); // copy but constant. 29 } BOOST_LOCAL_FUNCTION_NAME(f) 30 f(); 31 32 return 0; 33 } 34 //] 35 36