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source: code/branches/FICN/src/util/Convert.h @ 748

Last change on this file since 748 was 742, checked in by landauf, 17 years ago

moved all files from misc and the tinyxml folder into the new util folder

File size: 2.6 KB
Line 
1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *
4 *
5 *   License notice:
6 *
7 *   This program is free software; you can redistribute it and/or
8 *   modify it under the terms of the GNU General Public License
9 *   as published by the Free Software Foundation; either version 2
10 *   of the License, or (at your option) any later version.
11 *
12 *   This program 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 *   You should have received a copy of the GNU General Public License
18 *   along with this program; if not, write to the Free Software
19 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
20 *
21 *   Author:
22 *      Benjamin Grauer
23 *   Co-authors:
24 *      Fabian 'x3n' Landau
25 */
26
27/*!
28    @file Convert.h
29    @brief Definition and Implementation of the Convert class.
30*/
31
32#ifndef _Convert_H__
33#define _Convert_H__
34
35#include <string>
36#include <sstream>
37
38
39// DEFAULT CLASS
40template <typename FromType, typename ToType>
41class Converter
42{
43 public:
44  bool operator()(ToType* output, const FromType& input) const
45  {
46    return false;
47  }
48};
49
50// PARTIAL SPECIALIZATION TO CONVERT TO STRINGS
51template<typename FromType>
52class Converter<FromType, std::string>
53{
54 public:
55  bool operator()(std::string* output, const FromType& input) const
56  {
57    std::ostringstream oss;
58    if (oss << input)
59    {
60      (*output) = oss.str();
61      return true;
62    }
63    else
64      return false;
65  }
66};
67
68// PARTIAL SPECIALIZATION TO CONVERT FROM STRING
69template<typename ToType>
70class Converter<std::string, ToType>
71{
72 public:
73  bool operator()(ToType* output, const std::string& input) const
74  {
75    std::istringstream iss(input);
76    if (iss >> (*output))
77      return true;
78    else
79      return false;
80  }
81};
82
83// FUNCTION SO WE DO NOT HAVE TO TELL THE COMPILER ABOUT THE TYPE
84template<typename FromType, typename ToType>
85static bool ConvertValue(ToType* output, const FromType& input)
86{
87  Converter<FromType, ToType> converter;
88  return converter(output, input);
89}
90
91// THE SAME, BUT WITH DEFAULT VALUE
92template<typename FromType, typename ToType>
93static bool ConvertValue(ToType* output, const FromType& input, const ToType& fallback)
94{
95  Converter<FromType, ToType> converter;
96  if (converter(output, input))
97    return true;
98
99  (*output) = fallback;
100  return false;
101}
102
103#endif /* _Convert_H__ */
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