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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/local_function.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <iostream>
#define LOCAL_INC_DEC(offset) \
int BOOST_LOCAL_FUNCTION_ID(BOOST_PP_CAT(inc, __LINE__), /* unique ID */ \
(const bind offset) (const int x) ) { \
return x + offset; \
} BOOST_LOCAL_FUNCTION_NAME(inc) \
\
int BOOST_LOCAL_FUNCTION_ID(BOOST_PP_CAT(dec, __LINE__), \
(const bind offset) (const int x) ) { \
return x - offset; \
} BOOST_LOCAL_FUNCTION_NAME(dec)
#define LOCAL_INC_DEC_TPL(offset) \
T BOOST_LOCAL_FUNCTION_ID_TPL(BOOST_PP_CAT(inc, __LINE__), \
(const bind offset) (const T x) ) { \
return x + offset; \
} BOOST_LOCAL_FUNCTION_NAME_TPL(inc) \
\
T BOOST_LOCAL_FUNCTION_ID_TPL(BOOST_PP_CAT(dec, __LINE__), \
(const bind offset) (const T x) ) { \
return x - offset; \
} BOOST_LOCAL_FUNCTION_NAME_TPL(dec)
template<typename T>
void f(T& delta) {
LOCAL_INC_DEC_TPL(delta) // Multiple local functions on same line.
BOOST_TEST(dec(inc(123)) == 123);
}
int main(void) {
int delta = 10;
LOCAL_INC_DEC(delta) // Declare local functions on same line using `_ID`.
BOOST_TEST(dec(inc(123)) == 123);
f(delta);
return boost::report_errors();
}
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