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
25 /// \todo Improve documentation
28 #ifndef __defined_libdai_enum_h
29 #define __defined_libdai_enum_h
34 #include <dai/exceptions.h>
37 /// Extends the C++ enum type by supporting input/output streaming and conversion to and from const char*
40 * DAI_ENUM(colors,RED,GREEN,BLUE)
42 * defines a class encapsulating an
44 * enum colors {RED, GREEN, BLUE};
46 * It offers additional functionality over the plain "enum" keyword.
48 #define DAI_ENUM(x,val0,...) class x {\
50 enum value {val0,__VA_ARGS__};\
57 static char const* labelstring = #val0 "," #__VA_ARGS__ ",";\
58 size_t pos_begin = 0;\
60 for( size_t pos_end = 0; labelstring[pos_end] != '\0'; pos_end++ )\
61 if( (labelstring[pos_end] == ',') ) {\
62 if( (strlen( w ) == pos_end - pos_begin) && (strncmp( labelstring + pos_begin, w, pos_end - pos_begin ) == 0) ) {\
67 pos_begin = pos_end + 1;\
70 DAI_THROW(UNKNOWN_ENUM_VALUE);\
73 operator value() const { return v; }\
75 operator size_t() const { return (size_t)v; }\
77 operator char const*() const {\
78 static char labelstring[] = #val0 "," #__VA_ARGS__;\
79 size_t pos_begin = 0;\
81 for( size_t pos_end = 0; ; pos_end++ )\
82 if( (labelstring[pos_end] == ',') || (labelstring[pos_end] == '\0') ) {\
83 if( (size_t)v == i ) {\
84 labelstring[pos_end] = '\0';\
85 return labelstring + pos_begin;\
88 pos_begin = pos_end + 1;\
93 friend std::istream& operator >> (std::istream& is, x& y) {\
100 friend std::ostream& operator << (std::ostream& os, const x& y) {\
101 os << (const char *)y;\