49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
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// Copyright (C) 2009-2012 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0
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// (see accompanying file LICENSE_1_0.txt or a copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Home at http://www.boost.org/libs/local_function
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#include <boost/local_function.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/detail/lightweight_test.hpp>
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#include <iostream>
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#define LOCAL_INC_DEC(offset) \
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int BOOST_LOCAL_FUNCTION_ID(BOOST_PP_CAT(inc, __LINE__), /* unique ID */ \
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(const bind offset) (const int x) ) { \
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return x + offset; \
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} BOOST_LOCAL_FUNCTION_NAME(inc) \
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\
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int BOOST_LOCAL_FUNCTION_ID(BOOST_PP_CAT(dec, __LINE__), \
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(const bind offset) (const int x) ) { \
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return x - offset; \
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} BOOST_LOCAL_FUNCTION_NAME(dec)
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#define LOCAL_INC_DEC_TPL(offset) \
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T BOOST_LOCAL_FUNCTION_ID_TPL(BOOST_PP_CAT(inc, __LINE__), \
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(const bind offset) (const T x) ) { \
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return x + offset; \
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} BOOST_LOCAL_FUNCTION_NAME_TPL(inc) \
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\
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T BOOST_LOCAL_FUNCTION_ID_TPL(BOOST_PP_CAT(dec, __LINE__), \
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(const bind offset) (const T x) ) { \
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return x - offset; \
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} BOOST_LOCAL_FUNCTION_NAME_TPL(dec)
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template<typename T>
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void f(T& delta) {
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LOCAL_INC_DEC_TPL(delta) // Multiple local functions on same line.
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BOOST_TEST(dec(inc(123)) == 123);
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}
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int main(void) {
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int delta = 10;
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LOCAL_INC_DEC(delta) // Declare local functions on same line using `_ID`.
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BOOST_TEST(dec(inc(123)) == 123);
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f(delta);
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return boost::report_errors();
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}
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