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- // 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/config.hpp>
- #ifdef BOOST_NO_CXX11_VARIADIC_MACROS
- # error "variadic macros required"
- #else
- #include <boost/local_function.hpp>
- #include <boost/function.hpp>
- #include <boost/typeof/typeof.hpp>
- #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
- #include <boost/detail/lightweight_test.hpp>
- BOOST_TYPEOF_REGISTER_TEMPLATE(boost::function, 1)
- boost::function<int (int)> derivative(boost::function<int (int)>& f, int dx) {
- int BOOST_LOCAL_FUNCTION(bind& f, const bind dx, int x) {
- return (f(x + dx) - f(x)) / dx;
- } BOOST_LOCAL_FUNCTION_NAME(deriv)
- return deriv;
- }
- int main(void) {
- int BOOST_LOCAL_FUNCTION(int x) {
- return x + 4;
- } BOOST_LOCAL_FUNCTION_NAME(add2)
-
- boost::function<int (int)> a2 = add2; // Reference valid where closure used.
- boost::function<int (int)> d2 = derivative(a2, 2);
- BOOST_TEST(d2(6) == 1);
- return boost::report_errors();
- }
- #endif // VARIADIC_MACROS
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