bump version to 12.2.2-pve1

[ceph.git] / ceph / src / boost / libs / core / doc / no_exceptions_support.qbk

[/
  Copyright 2004 Pavel Vozenilek
  Copyright 2014 Peter Dimov

  Distributed under the Boost Software License, Version 1.0.

  See accompanying file LICENSE_1_0.txt
  or copy at http://boost.org/LICENSE_1_0.txt
]

[section:no_exceptions_support no_exceptions_support]

[simplesect Authors]

* Pavel Vozenilek

[endsimplesect]

[section Header <boost/core/no_exceptions_support.hpp>]

The header `<boost/core/no_exceptions_support.hpp>` defines
macros for use in code that needs to be portable to environments
that do not have support for C++ exceptions.

[section Synopsis]

``
#define BOOST_TRY /*unspecified*/
#define BOOST_CATCH(x) /*unspecified*/
#define BOOST_CATCH_END /*unspecified*/
#define BOOST_RETHROW /*unspecified*/
``

[endsect]

[section Example Use]

``
void foo() {
  BOOST_TRY {
    ...
  } BOOST_CATCH(const std::bad_alloc&) {
      ...
      BOOST_RETHROW
  } BOOST_CATCH(const std::exception& e) {
      ...
  }
  BOOST_CATCH_END
}
``

With exception support enabled it will expand into:

``
void foo() {
  { try {
    ...
  } catch (const std::bad_alloc&) {
      ...
      throw;
  } catch (const std::exception& e) {
      ...
  }
  }
}
``

With exception support disabled it will expand into:

``
void foo() {
  { if(true) {
    ...
  } else if (false) {
      ...
  } else if (false)  {
      ...
  }
  }
}
``

[endsect]

[endsect]

[endsect]