1 /* Copyright (C) 2006-2008 Joris Mooij [joris dot mooij at tuebingen dot mpg dot de]
2 Radboud University Nijmegen, The Netherlands /
3 Max Planck Institute for Biological Cybernetics, Germany
5 This file is part of libDAI.
7 libDAI 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 2 of the License, or
10 (at your option) any later version.
12 libDAI 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.
17 You should have received a copy of the GNU General Public License
18 along with libDAI; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 /// \brief Defines the DAI_ENUM macro
27 #ifndef __defined_libdai_enum_h
28 #define __defined_libdai_enum_h
33 #include <dai/exceptions.h>
36 /// Extends the C++ enum type by supporting input/output streaming and conversion to and from const char* and size_t
37 /** For more details see the source code.
41 * DAI_ENUM(colors,RED,GREEN,BLUE)
43 * defines a class \a colors encapsulating an
45 * enum {RED, GREEN, BLUE};
47 * which offers additional functionality over the plain \c enum keyword.
49 #define DAI_ENUM(x,val0,...) class x {\
51 enum value {val0,__VA_ARGS__};\
58 static char const* labelstring = #val0 "," #__VA_ARGS__ ",";\
59 size_t pos_begin = 0;\
61 for( size_t pos_end = 0; labelstring[pos_end] != '\0'; pos_end++ )\
62 if( (labelstring[pos_end] == ',') ) {\
63 if( (strlen( w ) == pos_end - pos_begin) && (strncmp( labelstring + pos_begin, w, pos_end - pos_begin ) == 0) ) {\
68 pos_begin = pos_end + 1;\
71 DAI_THROW(UNKNOWN_ENUM_VALUE);\
74 operator value() const { return v; }\
76 operator size_t() const { return (size_t)v; }\
78 operator char const*() const {\
79 static char labelstring[] = #val0 "," #__VA_ARGS__;\
80 size_t pos_begin = 0;\
82 for( size_t pos_end = 0; ; pos_end++ )\
83 if( (labelstring[pos_end] == ',') || (labelstring[pos_end] == '\0') ) {\
84 if( (size_t)v == i ) {\
85 labelstring[pos_end] = '\0';\
86 return labelstring + pos_begin;\
89 pos_begin = pos_end + 1;\
94 friend std::istream& operator >> (std::istream& is, x& y) {\
101 friend std::ostream& operator << (std::ostream& os, const x& y) {\
102 os << (const char *)y;\