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source: code/branches/network_old/src/util/Convert.h @ 883

Last change on this file since 883 was 790, checked in by nicolasc, 17 years ago

merged FICN back into trunk
awaiting release.

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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