boost/detail/no_exceptions_support.hpp

   1 #ifndef BOOST_DETAIL_NO_EXCEPTIONS_SUPPORT_HPP_
   2 #define BOOST_DETAIL_NO_EXCEPTIONS_SUPPORT_HPP_
   3
   4 #if (defined _MSC_VER) && (_MSC_VER >= 1200)
   5 #  pragma once
   6 #endif
   7
   8 //----------------------------------------------------------------------
   9 // (C) Copyright 2004 Pavel Vozenilek.
  10 // Use, modification and distribution is subject to the Boost Software
  11 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt
  12 // or copy at http://www.boost.org/LICENSE_1_0.txt)
  13 //
  14 //
  15 // This file contains helper macros used when exception support may be
  16 // disabled (as indicated by macro BOOST_NO_EXCEPTIONS).
  17 //
  18 // Before picking up these macros you may consider using RAII techniques
  19 // to deal with exceptions - their syntax can be always the same with
  20 // or without exception support enabled.
  21 //
  22
  23 /* Example of use:
  24
  25 void foo() {
  26   BOOST_TRY {
  27     ...
  28   } BOOST_CATCH(const std::bad_alloc&) {
  29       ...
  30       BOOST_RETHROW
  31   } BOOST_CATCH(const std::exception& e) {
  32       ...
  33   }
  34   BOOST_CATCH_END
  35 }
  36
  37 With exception support enabled it will expand into:
  38
  39 void foo() {
  40   { try {
  41     ...
  42   } catch (const std::bad_alloc&) {
  43       ...
  44       throw;
  45   } catch (const std::exception& e) {
  46       ...
  47   }
  48   }
  49 }
  50
  51 With exception support disabled it will expand into:
  52
  53 void foo() {
  54   { if(true) {
  55     ...
  56   } else if (false) {
  57       ...
  58   } else if (false)  {
  59       ...
  60   }
  61   }
  62 }
  63 */
  64 //----------------------------------------------------------------------
  65
  66 #include <boost/config.hpp>
  67 #include <boost/detail/workaround.hpp>
  68
  69 #if !(defined BOOST_NO_EXCEPTIONS)
  70 #    define BOOST_TRY { try
  71 #    define BOOST_CATCH(x) catch(x)
  72 #    define BOOST_RETHROW throw;
  73 #    define BOOST_CATCH_END }
  74 #else
  75 #    if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
  76 #        define BOOST_TRY { if ("")
  77 #        define BOOST_CATCH(x) else if (!"")
  78 #    else
  79 #        define BOOST_TRY { if (true)
  80 #        define BOOST_CATCH(x) else if (false)
  81 #    endif
  82 #    define BOOST_RETHROW
  83 #    define BOOST_CATCH_END }
  84 #endif
  85
  86
  87 #endif