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-rw-r--r-- | src/boost/libs/local_function/example/add_global_functor.cpp | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/boost/libs/local_function/example/add_global_functor.cpp b/src/boost/libs/local_function/example/add_global_functor.cpp new file mode 100644 index 000000000..229b31525 --- /dev/null +++ b/src/boost/libs/local_function/example/add_global_functor.cpp @@ -0,0 +1,38 @@ + +// 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(); +} +//] + |