libstdc++: exception_defines.h Source File

libstdc++

exception_defines.h
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1// -fno-exceptions Support -*- C++ -*-
2
3// Copyright (C) 2001-2026 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file bits/exception_defines.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{exception}
28 */
29
30#ifndef _EXCEPTION_DEFINES_H
31#define _EXCEPTION_DEFINES_H 1
32
33#if ! __cpp_exceptions
34// Iff -fno-exceptions, transform error handling code to work without it.
35# define __try if (true)
36# define __catch(X) if (false)
37# define __throw_exception_again
38#else
39// Else proceed normally.
40# define __try try
41# define __catch(X) catch(X)
42# define __throw_exception_again throw
43#endif
44
45#endif