libstdc++-v3/libsupc++/exception.h

   1 // Exception Handling support header for -*- C++ -*-
   2
   3 // Copyright (C) 2016-2020 Free Software Foundation, Inc.
   4 //
   5 // This file is part of GCC.
   6 //
   7 // GCC is free software; you can redistribute it and/or modify
   8 // it under the terms of the GNU General Public License as published by
   9 // the Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // GCC is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 /** @file bits/exception.h
  27  *  This is an internal header file, included by other library headers.
  28  *  Do not attempt to use it directly.
  29  */
  30
  31 #ifndef __EXCEPTION_H
  32 #define __EXCEPTION_H 1
  33
  34 #pragma GCC system_header
  35
  36 #pragma GCC visibility push(default)
  37
  38 #include <bits/c++config.h>
  39
  40 extern "C++" {
  41
  42 namespace std
  43 {
  44   /**
  45    * @defgroup exceptions Exceptions
  46    * @ingroup diagnostics
  47    *
  48    * Classes and functions for reporting errors via exception classes.
  49    * @{
  50    */
  51
  52   /**
  53    *  @brief Base class for all library exceptions.
  54    *
  55    *  This is the base class for all exceptions thrown by the standard
  56    *  library, and by certain language expressions.  You are free to derive
  57    *  your own %exception classes, or use a different hierarchy, or to
  58    *  throw non-class data (e.g., fundamental types).
  59    */
  60   class exception
  61   {
  62   public:
  63     exception() _GLIBCXX_NOTHROW { }
  64     virtual ~exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_NOTHROW;
  65 #if __cplusplus >= 201103L
  66     exception(const exception&) = default;
  67     exception& operator=(const exception&) = default;
  68     exception(exception&&) = default;
  69     exception& operator=(exception&&) = default;
  70 #endif
  71
  72     /** Returns a C-style character string describing the general cause
  73      *  of the current error.  */
  74     virtual const char*
  75     what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_NOTHROW;
  76   };
  77
  78 } // namespace std
  79
  80 }
  81
  82 #pragma GCC visibility pop
  83
  84 #endif