1#ifndef BOOST_CORE_NO_EXCEPTIONS_SUPPORT_HPP
2#define BOOST_CORE_NO_EXCEPTIONS_SUPPORT_HPP
3
4#if defined(_MSC_VER)
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#include <boost/config.hpp>
24#include <boost/config/workaround.hpp>
25
26#if !(defined BOOST_NO_EXCEPTIONS)
27# define BOOST_TRY { try
28# define BOOST_CATCH(x) catch(x)
29# define BOOST_RETHROW throw;
30# define BOOST_CATCH_END }
31#else
32# if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x564))
33# define BOOST_TRY { if ("")
34# define BOOST_CATCH(x) else if (!"")
35# elif !defined(BOOST_MSVC) || BOOST_MSVC >= 1900
36# define BOOST_TRY { if (true)
37# define BOOST_CATCH(x) else if (false)
38# else
39 // warning C4127: conditional expression is constant
40# define BOOST_TRY { \
41 __pragma(warning(push)) \
42 __pragma(warning(disable: 4127)) \
43 if (true) \
44 __pragma(warning(pop))
45# define BOOST_CATCH(x) else \
46 __pragma(warning(push)) \
47 __pragma(warning(disable: 4127)) \
48 if (false) \
49 __pragma(warning(pop))
50# endif
51# define BOOST_RETHROW
52# define BOOST_CATCH_END }
53#endif
54
55
56#endif
57

source code of include/boost/core/no_exceptions_support.hpp