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source: code/branches/core2/src/util/UtilPrereqs.h @ 1001

Last change on this file since 1001 was 1001, checked in by landauf, 16 years ago

ok, be aware, here comes a big one. people with weak nerves should probably better look away or take some serious drugs.
this update includes partial and explicit class template specialization, partial and explicit specialized template function overloading, template meta programming and a simple typecast.
yeah right, a typecast. but let me explain the whole story from the beginning.

it all started with a simple problem: i had a double in a MultiType and wanted a float, but i always got 0. what was the problem? the conversion 'MultiType to anyting' was handled by the Converter class in util/Convert.h and the Converter was specialized for strings, multitypes, vectors and so on, but not for int, float, bool, …
so i've first wanted to implement a typecast as default, but this was a bad idea because it doesn't work for almost every generic type.
implementing an explicit specialization for every possible pair of primitives (did you ever happened to use an unsigned short? or a long double? no? ignorants :D) would have been a simple but ugly solution.
but there were other problems: if there's a rule to convert a string into anything and another rule to convert anything into an int - what happens if you want to convert a string into an int? compiler error! …ambiguous partial template specialization.
so i've spent days and nights to find a solution. this is my 5th try or so and i'm still really unsure if it works, but it's the first version i want to commit to have at least a backup.
if you're interested in looking at the code you better wait until i've cleaned up the whole thing, it's a real mess. and i want to do further tests, but now i'm tired. good night ;)
File size: 2.1 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 *      Reto Grieder
23 *   Co-authors:
24 *      Fabian 'x3n' Landau
25 *
26 */
27
28/**
29 @file  UtilPrereq.h
30 @brief Contains all the necessary forward declarations for all classes, structs and enums.
31 */
32
33#ifndef _UtilPrereqs_H__
34#define _UtilPrereqs_H__
35
36#include "orxonox/OrxonoxPlatform.h"
37
38//-----------------------------------------------------------------------
39// Shared library settings
40//-----------------------------------------------------------------------
41#if (ORXONOX_PLATFORM == ORXONOX_PLATFORM_WIN32) && !defined( UTIL_STATIC_BUILD )
42#  ifdef UTIL_SHARED_BUILD
43#    define _UtilExport __declspec(dllexport)
44#  else
45#    if defined( __MINGW32__ )
46#      define _UtilExport
47#    else
48#      define _UtilExport __declspec(dllimport)
49#    endif
50#  endif
51#elif defined ( ORXONOX_GCC_VISIBILITY )
52#  define _UtilExport  __attribute__ ((visibility("default")))
53#else
54#  define _UtilExport
55#endif
56
57
58//-----------------------------------------------------------------------
59// Forward declarations
60//-----------------------------------------------------------------------
61class Convert;
62//template <typename FromType, typename ToType>
63//class Converter;
64class MultiTypePrimitive;
65class MultiTypeString;
66class MultiTypeMath;
67template <class T>
68class String2Number;
69class SubString;
70
71#endif /* _UtilPrereqs_H__ */
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