libs/scope_exit/test/same_line_seq.cpp

   1
   2 // Copyright (C) 2006-2009, 2012 Alexander Nasonov
   3 // Copyright (C) 2012 Lorenzo Caminiti
   4 // Distributed under the Boost Software License, Version 1.0
   5 // (see accompanying file LICENSE_1_0.txt or a copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7 // Home at http://www.boost.org/libs/scope_exit
   8
   9 #include <boost/scope_exit.hpp>
  10 #include <boost/preprocessor/cat.hpp>
  11 #include <boost/config.hpp>
  12 #include <boost/detail/lightweight_test.hpp>
  13
  14 #define SCOPE_EXIT_INC_DEC(variable, offset) \
  15     BOOST_SCOPE_EXIT_ID(BOOST_PP_CAT(inc, __LINE__), /* unique ID */ \
  16             (&variable) (offset) ) { \
  17         variable += offset; \
  18     } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(inc, __LINE__)) \
  19     \
  20     BOOST_SCOPE_EXIT_ID(BOOST_PP_CAT(dec, __LINE__), \
  21             (&variable) (offset) ) { \
  22         variable -= offset; \
  23     } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(dec, __LINE__))
  24
  25 #define SCOPE_EXIT_INC_DEC_TPL(variable, offset) \
  26     BOOST_SCOPE_EXIT_ID_TPL(BOOST_PP_CAT(inc, __LINE__), \
  27             (&variable) (offset) ) { \
  28         variable += offset; \
  29     } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(inc, __LINE__)) \
  30     \
  31     BOOST_SCOPE_EXIT_ID_TPL(BOOST_PP_CAT(dec, __LINE__), \
  32             (&variable) (offset) ) { \
  33         variable -= offset; \
  34     } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(dec, __LINE__))
  35
  36 #define SCOPE_EXIT_ALL_INC_DEC(variable, offset) \
  37     BOOST_SCOPE_EXIT_ALL_ID(BOOST_PP_CAT(inc, __LINE__), \
  38             (=) (&variable) ) { \
  39         variable += offset; \
  40     }; \
  41     BOOST_SCOPE_EXIT_ALL_ID(BOOST_PP_CAT(dec, __LINE__), \
  42             (=) (&variable) ) { \
  43         variable -= offset; \
  44     };
  45
  46 template<typename T>
  47 void f(T& x, T& delta) {
  48     SCOPE_EXIT_INC_DEC_TPL(x, delta)
  49     BOOST_TEST(x == 0);
  50 }
  51
  52 int main(void) {
  53     int x = 0, delta = 10;
  54
  55     {
  56         SCOPE_EXIT_INC_DEC(x, delta)
  57     }
  58     BOOST_TEST(x == 0);
  59
  60     f(x, delta);
  61
  62 #ifndef BOOST_NO_CXX11_LAMBDAS
  63     {
  64         SCOPE_EXIT_ALL_INC_DEC(x, delta)
  65     }
  66     BOOST_TEST(x == 0);
  67 #endif // LAMBDAS
  68
  69     return boost::report_errors();
  70 }
  71