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casts.hh
1 // -*- coding: utf-8 -*-
2 // Copyright (C) 2011, 2015 Laboratoire de Recherche et Développement
3 // de l'Epita (LRDE).
4 //
5 // This file is part of Spot, a model checking library.
6 //
7 // Spot is free software; you can redistribute it and/or modify it
8 // under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 3 of the License, or
10 // (at your option) any later version.
11 //
12 // Spot is distributed in the hope that it will be useful, but WITHOUT
13 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 // License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program. If not, see <http://www.gnu.org/licenses/>.
19 
20 #pragma once
21 
22 // We usually write code like
23 // subclass* i = down_cast<subclass*>(m);
24 // assert(i);
25 // ... use i ...
26 // When NDEBUG is set, the down_cast is a fast static_cast
27 // and the assert has no effect.
28 // Otherwise, the down_cast is a dynamic_cast and may return 0
29 // on error, which the assert catches.
30 
31 #if NDEBUG
32 # define down_cast static_cast
33 #else
34 # define down_cast dynamic_cast
35 #endif

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