c77dd0a4bd
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53088 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
72 lines
3.4 KiB
C++
72 lines
3.4 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: container.h
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// Purpose: topic overview
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// Author: wxWidgets team
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// RCS-ID: $Id$
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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/**
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@page overview_container Container Classes
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Classes: wxList<T>, wxArray<T>, wxVector<T>
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wxWidgets uses itself several container classes including doubly-linked lists
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and dynamic arrays (i.e. arrays which expand automatically when they become
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full). For both historical and portability reasons wxWidgets does not require
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the use of STL (which provides the standard implementation of many container
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classes in C++) but it can be compiled in STL mode. Additionally, wxWidgets
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provides the new wxVector<T> class template which can be used like the std::vector
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class and is actually just a typedef to std::vector if wxWidgets is compiled
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in STL mode.
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wxWidgets non-template container classes don't pretend to be as powerful or full as STL
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ones, but they are quite useful and may be compiled with absolutely any C++
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compiler. They're used internally by wxWidgets, but may, of course, be used in
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your programs as well if you wish.
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The list classes in wxWidgets are doubly-linked lists which may either own the
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objects they contain (meaning that the list deletes the object when it is
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removed from the list or the list itself is destroyed) or just store the
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pointers depending on whether or not you called wxList<T>::DeleteContents()
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method.
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Dynamic arrays resemble C arrays but with two important differences: they
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provide run-time range checking in debug builds and they automatically expand
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the allocated memory when there is no more space for new items. They come in
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two sorts: the "plain" arrays which store either built-in types such as "char",
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"int" or "bool" or the pointers to arbitrary objects, or "object arrays" which
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own the object pointers to which they store.
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For the same portability reasons, the container classes implementation in
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wxWidgets does not use templates, but is rather based on C preprocessor i.e. is
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done with the macros: WX_DECLARE_LIST() and WX_DEFINE_LIST() for the linked
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lists and WX_DECLARE_ARRAY(), WX_DECLARE_OBJARRAY() and WX_DEFINE_OBJARRAY()
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for the dynamic arrays.
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The "DECLARE" macro declares a new container class containing the elements of
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given type and is needed for all three types of container classes: lists,
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arrays and objarrays. The "DEFINE" classes must be inserted in your program in
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a place where the @e full declaration of container element class is in scope
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(i.e. not just forward declaration), otherwise destructors of the container
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elements will not be called!
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As array classes never delete the items they contain anyhow, there is no
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WX_DEFINE_ARRAY() macro for them.
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Examples of usage of these macros may be found in wxList<T> and wxArray<T>
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documentation.
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Finally, wxWidgets predefines several commonly used container classes. wxList
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is defined for compatibility with previous versions as a list containing
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wxObjects and wxStringList as a list of C-style strings (char *), both of these
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classes are deprecated and should not be used in new programs. The following
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array classes are defined: wxArrayInt, wxArrayLong, wxArrayPtrVoid and
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wxArrayString. The first three store elements of corresponding types, but
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wxArrayString is somewhat special: it is an optimized version of wxArray which
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uses its knowledge about wxString reference counting schema.
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*/
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