39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
|
|
// Copyright (C) 2009-2012 Lorenzo Caminiti
|
|
// Distributed under the Boost Software License, Version 1.0
|
|
// (see accompanying file LICENSE_1_0.txt or a copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
// Home at http://www.boost.org/libs/local_function
|
|
|
|
#include <boost/detail/lightweight_test.hpp>
|
|
#include <algorithm>
|
|
|
|
//[add_global_functor
|
|
// Unfortunately, cannot be defined locally (so not a real alternative).
|
|
struct global_add { // Unfortunately, boilerplate code to program the class.
|
|
global_add(int& _sum, int _factor): sum(_sum), factor(_factor) {}
|
|
|
|
inline void operator()(int num) { // Body uses C++ statement syntax.
|
|
sum += factor * num;
|
|
}
|
|
|
|
private: // Unfortunately, cannot bind so repeat variable types.
|
|
int& sum; // Access `sum` by reference.
|
|
const int factor; // Make `factor` constant.
|
|
};
|
|
|
|
int main(void) {
|
|
int sum = 0, factor = 10;
|
|
|
|
global_add add(sum, factor);
|
|
|
|
add(1);
|
|
int nums[] = {2, 3};
|
|
std::for_each(nums, nums + 2, add); // Passed as template parameter.
|
|
|
|
BOOST_TEST(sum == 60);
|
|
return boost::report_errors();
|
|
}
|
|
//]
|
|
|