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Add DEFINE_ENUM_CONVERT macro for defining PBD::string_to/to_string for enums

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A simple macro for defining the four template specializations required to
convert an enum to a string and back using the existing string_2_enum and
enum_2_string functions. Generally these will only be instantiated in one
source file, I don't think it is necessary to explicitly instantiate any at
this stage.
This commit is contained in:
Tim Mayberry 2016-08-24 22:25:51 +10:00
parent f4f4c01f4c
commit 95b4fd64dd
1 changed files with 56 additions and 0 deletions
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56
libs/pbd/pbd/enum_convert.h Normal file
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/*
Copyright (C) 2015 Tim Mayberry
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef PBD_ENUM_CONVERT_H
#define PBD_ENUM_CONVERT_H
#include "pbd/enumwriter.h"
#include "pbd/string_convert.h"
#define TO_STRING_FULL(Type) \
template <> \
inline bool to_string (Type val, std::string& str) \
{ \
str = enum_2_string (val); \
return true; \
}
#define STRING_TO_FULL(Type) \
template <> \
inline bool string_to (const std::string& str, Type& val) \
{ \
val = (Type)string_2_enum (str, val); \
return true; \
}
#define TO_STRING(Type) \
template<> inline std::string to_string (Type val) \
{ return enum_2_string (val); }
#define STRING_TO(Type) \
template<> inline Type string_to (const std::string& str) \
{ Type val; return (Type) string_2_enum (str, val); }
#define DEFINE_ENUM_CONVERT(Type) \
TO_STRING_FULL (Type) \
STRING_TO_FULL (Type) \
TO_STRING (Type) \
STRING_TO (Type)
#endif // PBD_ENUM_CONVERT_H