80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
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// Copyright (C) 2006-2009, 2012 Alexander Nasonov
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// Copyright (C) 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/scope_exit
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#include <boost/config.hpp>
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#ifdef BOOST_NO_CXX11_VARIADIC_MACROS
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# error "variadic macros required"
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#else
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#include <boost/scope_exit.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/detail/lightweight_test.hpp>
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//[same_line
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#define SCOPE_EXIT_INC_DEC(variable, offset) \
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BOOST_SCOPE_EXIT_ID(BOOST_PP_CAT(inc, __LINE__), /* unique ID */ \
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&variable, offset) { \
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variable += offset; \
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} BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(inc, __LINE__)) \
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\
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BOOST_SCOPE_EXIT_ID(BOOST_PP_CAT(dec, __LINE__), \
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&variable, offset) { \
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variable -= offset; \
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} BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(dec, __LINE__))
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#define SCOPE_EXIT_INC_DEC_TPL(variable, offset) \
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BOOST_SCOPE_EXIT_ID_TPL(BOOST_PP_CAT(inc, __LINE__), \
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&variable, offset) { \
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variable += offset; \
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} BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(inc, __LINE__)) \
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\
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BOOST_SCOPE_EXIT_ID_TPL(BOOST_PP_CAT(dec, __LINE__), \
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&variable, offset) { \
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variable -= offset; \
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} BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(dec, __LINE__))
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#define SCOPE_EXIT_ALL_INC_DEC(variable, offset) \
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BOOST_SCOPE_EXIT_ALL_ID(BOOST_PP_CAT(inc, __LINE__), \
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=, &variable) { \
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variable += offset; \
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}; \
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BOOST_SCOPE_EXIT_ALL_ID(BOOST_PP_CAT(dec, __LINE__), \
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=, &variable) { \
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variable -= offset; \
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};
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template<typename T>
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void f(T& x, T& delta) {
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SCOPE_EXIT_INC_DEC_TPL(x, delta) // Multiple scope exits on same line.
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BOOST_TEST(x == 0);
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}
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int main(void) {
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int x = 0, delta = 10;
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{
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SCOPE_EXIT_INC_DEC(x, delta) // Multiple scope exits on same line.
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}
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BOOST_TEST(x == 0);
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f(x, delta);
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#ifndef BOOST_NO_CXX11_LAMBDAS
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{
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SCOPE_EXIT_ALL_INC_DEC(x, delta) // Multiple scope exits on same line.
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}
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BOOST_TEST(x == 0);
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#endif // LAMBDAS
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return boost::report_errors();
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}
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//]
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#endif // variadic macros
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