glinsidelist.h

00001 /*
00002 Copyright (c) 2000-2003 Lee Thomason (www.grinninglizard.com)
00003 
00004 Grinning Lizard Utilities. Note that software that uses the 
00005 utility package (including Lilith3D and Kyra) have more restrictive
00006 licences which applies to code outside of the utility package.
00007 
00008 
00009 This software is provided 'as-is', without any express or implied 
00010 warranty. In no event will the authors be held liable for any 
00011 damages arising from the use of this software.
00012 
00013 Permission is granted to anyone to use this software for any 
00014 purpose, including commercial applications, and to alter it and 
00015 redistribute it freely, subject to the following restrictions:
00016 
00017 1. The origin of this software must not be misrepresented; you must 
00018 not claim that you wrote the original software. If you use this 
00019 software in a product, an acknowledgment in the product documentation 
00020 would be appreciated but is not required.
00021 
00022 2. Altered source versions must be plainly marked as such, and 
00023 must not be misrepresented as being the original software.
00024 
00025 3. This notice may not be removed or altered from any source 
00026 distribution.
00027 */
00028 
00029 #ifndef INPLACE_IMAGENODE_INCLUDED
00030 #define INPLACE_IMAGENODE_INCLUDED
00031 
00032 #ifdef _MSC_VER
00033 #pragma warning( disable : 4530 )
00034 #pragma warning( disable : 4786 )
00035 #endif
00036 
00037 #include "../../grinliz/gldebug.h"
00038 
00039 // The type of this must be a pointer.
00040 template <class T>
00041 class GlInsideNode
00042 {
00043   public:
00045         GlInsideNode()                                  { next = this; prev = this; data = 0; }
00046 
00048         GlInsideNode( T _data )                 { next = this; prev = this; data = _data; }
00049 
00050         virtual ~GlInsideNode()                 {}
00051 
00052         bool IsSentinel() const                 { return !data; }
00053         bool InList() const                             { return !(( next == this ) && ( prev == this )); }
00054 
00056         void InsertBefore( GlInsideNode<T>* addMe )
00057         {
00058                 GLASSERT( !addMe->IsSentinel() );
00059                 addMe->prev = prev;
00060                 prev->next = addMe;
00061                 prev = addMe;
00062                 addMe->next = this;
00063         }
00064 
00066         void InsertAfter( GlInsideNode<T>* addMe )
00067         {
00068                 GLASSERT( !addMe->IsSentinel() );
00069                 addMe->prev = this;
00070                 addMe->next = next;
00071                 next->prev = addMe;
00072                 next = addMe;
00073         }
00074 
00076         void Remove()
00077         {
00078                 prev->next = next;
00079                 next->prev = prev;
00080                 prev = next = this;             // assume sentinel, again.
00081         }
00082         
00083         // Should be private, but I don't feel like fighting with
00084         // making templates friends.
00085 
00086         GlInsideNode<T>*        next;
00087         GlInsideNode<T>*        prev;
00088         T                                       data;
00089 };
00090 
00091 
00092 template <class T>
00093 class GlInsideNodeIt
00094 {
00095   public:
00096         GlInsideNodeIt( GlInsideNode<T>& _sentinel )     
00097                 : sentinel( &_sentinel ), current( 0 ) 
00098         { 
00099                 GLASSERT( sentinel->IsSentinel() ); 
00100         }
00101 
00102         GlInsideNode<T>*        CurrentNode()                                           { return current; }
00103         T                                       CurrentData()                                           { return current->data; }
00104         void                            SetCurrent( GlInsideNode<T>* c )        { current = c; }
00105 
00106         void Begin()    { current = sentinel->next; }
00107         void Last()             { current = sentinel->prev; }
00108         void Next()             { current = current->next; }
00109         void Prev()             { current = current->prev; }
00110         bool Done()             { return current->IsSentinel(); }
00111                 
00112         void InsertBefore( GlInsideNode<T>& addMe )     { current->InsertBefore( &addMe ); }
00113         void InsertAfter(  GlInsideNode<T>& addMe )     { current->InsertAfter( &addMe ); }
00114 
00115   private:
00116         GlInsideNode<T>*        sentinel;
00117         GlInsideNode<T>*        current;
00118 };
00119 
00120 
00121 #endif

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