| 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/preprocessor/cat.hpp> |
| 10 | #include <boost/detail/lightweight_test.hpp> |
| 11 | #include <iostream> |
| 12 | |
| 13 | #define LOCAL_INC_DEC(offset) \ |
| 14 | int BOOST_LOCAL_FUNCTION_ID(BOOST_PP_CAT(inc, __LINE__), /* unique ID */ \ |
| 15 | (const bind offset) (const int x) ) { \ |
| 16 | return x + offset; \ |
| 17 | } BOOST_LOCAL_FUNCTION_NAME(inc) \ |
| 18 | \ |
| 19 | int BOOST_LOCAL_FUNCTION_ID(BOOST_PP_CAT(dec, __LINE__), \ |
| 20 | (const bind offset) (const int x) ) { \ |
| 21 | return x - offset; \ |
| 22 | } BOOST_LOCAL_FUNCTION_NAME(dec) |
| 23 | |
| 24 | #define LOCAL_INC_DEC_TPL(offset) \ |
| 25 | T BOOST_LOCAL_FUNCTION_ID_TPL(BOOST_PP_CAT(inc, __LINE__), \ |
| 26 | (const bind offset) (const T x) ) { \ |
| 27 | return x + offset; \ |
| 28 | } BOOST_LOCAL_FUNCTION_NAME_TPL(inc) \ |
| 29 | \ |
| 30 | T BOOST_LOCAL_FUNCTION_ID_TPL(BOOST_PP_CAT(dec, __LINE__), \ |
| 31 | (const bind offset) (const T x) ) { \ |
| 32 | return x - offset; \ |
| 33 | } BOOST_LOCAL_FUNCTION_NAME_TPL(dec) |
| 34 | |
| 35 | template<typename T> |
| 36 | void f(T& delta) { |
| 37 | LOCAL_INC_DEC_TPL(delta) // Multiple local functions on same line. |
| 38 | BOOST_TEST(dec(inc(123)) == 123); |
| 39 | } |
| 40 | |
| 41 | int main(void) { |
| 42 | int delta = 10; |
| 43 | LOCAL_INC_DEC(delta) // Declare local functions on same line using `_ID`. |
| 44 | BOOST_TEST(dec(inc(123)) == 123); |
| 45 | f(delta); |
| 46 | return boost::report_errors(); |
| 47 | } |
| 48 | |
| 49 |