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wxWidgets/include/wx/dynarray.h
Vadim Zeitlin 2c356747d9 WX_CLEAR_ARRAY() now calls Empty() too 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1382 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1999-01-12 23:37:45 +00:00

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///////////////////////////////////////////////////////////////////////////////
// Name: dynarray.h
// Purpose: auto-resizable (i.e. dynamic) array support
// Author: Vadim Zeitlin
// Modified by:
// Created: 12.09.97
// RCS-ID: $Id$
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows license
///////////////////////////////////////////////////////////////////////////////
#ifndef _DYNARRAY_H
#define _DYNARRAY_H
#ifdef __GNUG__
#pragma interface "dynarray.h"
#endif
#include "wx/defs.h"
#include "wx/debug.h"
/** @name Dynamic arrays and object arrays (array which own their elements)
@memo Arrays which grow on demand and do range checking (only in debug)
*/
//@{
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
/**
the initial size by which an array grows when an element is added
default value avoids allocate one or two bytes when the array is created
which is rather inefficient
*/
#define WX_ARRAY_DEFAULT_INITIAL_SIZE (16)
// ----------------------------------------------------------------------------
// types
// ----------------------------------------------------------------------------
/**
callback compare function for quick sort
must return negative value, 0 or positive value if pItem1 <, = or > pItem2
*/
#ifdef __VISUALC__
#define CMPFUNC_CONV _cdecl
#else // !Visual C++
#define CMPFUNC_CONV
#endif // compiler
typedef int (CMPFUNC_CONV *CMPFUNC)(const void* pItem1, const void* pItem2);
// ----------------------------------------------------------------------------
/**
base class managing data having size of type 'long' (not used directly)
NB: for efficiency this often used class has no virtual functions (hence no
VTBL), even dtor is <B>not</B> virtual. If used as expected it won't
create any problems because ARRAYs from DEFINE_ARRAY have no dtor at all,
so it's not too important if it's not called (this happens when you cast
"SomeArray *" as "BaseArray *" and then delete it)
@memo Base class for template array classes
*/
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxBaseArray
{
public:
/** @name ctors and dtor */
//@{
/// default ctor
wxBaseArray();
/// copy ctor
wxBaseArray(const wxBaseArray& array);
/// assignment operator
wxBaseArray& operator=(const wxBaseArray& src);
/// not virtual, see above
/// EXCEPT for Gnu compiler to reduce warnings...
#ifdef __GNUG__
virtual
#endif
~wxBaseArray();
//@}
/** @name memory management */
//@{
/// empties the array, but doesn't release memory
void Empty() { m_nCount = 0; }
/// empties the array and releases memory
void Clear();
/// preallocates memory for given number of items
void Alloc(size_t uiSize);
/// minimizes the memory used by the array (frees unused memory)
void Shrink();
//@}
/** @name simple accessors */
//@{
/// number of elements in the array
size_t Count() const { return m_nCount; }
size_t GetCount() const { return m_nCount; }
/// is it empty?
bool IsEmpty() const { return m_nCount == 0; }
//@}
protected:
// these methods are protected because if they were public one could
// mistakenly call one of them instead of DEFINE_ARRAY's or OBJARRAY's
// type safe methods
/** @name items access */
//@{
/// get item at position uiIndex (range checking is done in debug version)
long& Item(size_t uiIndex) const
{ wxASSERT( uiIndex < m_nCount ); return m_pItems[uiIndex]; }
/// same as Item()
long& operator[](size_t uiIndex) const { return Item(uiIndex); }
//@}
/** @name item management */
//@{
/**
Search the element in the array, starting from the either side
@param bFromEnd if TRUE, start from the end
@return index of the first item matched or NOT_FOUND
@see NOT_FOUND
*/
int Index(long lItem, bool bFromEnd = FALSE) const;
/// search for an item using binary search in a sorted array
int Index(long lItem, CMPFUNC fnCompare) const;
/// add new element at the end
void Add(long lItem);
/// add item assuming the array is sorted with fnCompare function
void Add(long lItem, CMPFUNC fnCompare);
/// add new element at given position (it becomes Item[uiIndex])
void Insert(long lItem, size_t uiIndex);
/// remove first item matching this value
void Remove(long lItem);
/// remove item by index
void Remove(size_t uiIndex);
//@}
/// sort array elements using given compare function
void Sort(CMPFUNC fnCompare);
private:
void Grow(); // makes array bigger if needed
size_t m_nSize, // current size of the array
m_nCount; // current number of elements
long *m_pItems; // pointer to data
};
// ============================================================================
// template classes
// ============================================================================
// ----------------------------------------------------------------------------
// This macro generates a new array class. It is intended for storage of simple
// types of sizeof()<=sizeof(long) or pointers if sizeof(pointer)<=sizeof(long)
//
// NB: it has only inline functions => takes no space at all
// ----------------------------------------------------------------------------
#define _WX_DEFINE_ARRAY(T, name) \
typedef int (CMPFUNC_CONV *CMPFUNC##T)(T *pItem1, T *pItem2); \
class WXDLLEXPORTLOCAL name : public wxBaseArray \
{ \
public: \
name() \
{ wxASSERT( sizeof(T) <= sizeof(long) ); } \
\
name& operator=(const name& src) \
{ ((wxBaseArray *)this)->operator=((const wxBaseArray&)src); \
return *this; } \
\
T& operator[](size_t uiIndex) const \
{ return (T&)(wxBaseArray::Item(uiIndex)); } \
T& Item(size_t uiIndex) const \
{ return (T&)(wxBaseArray::Item(uiIndex)); } \
T& Last() const \
{ return (T&)(wxBaseArray::Item(Count() - 1)); } \
\
int Index(T Item, bool bFromEnd = FALSE) const \
{ return wxBaseArray::Index((long)Item, bFromEnd); } \
\
void Add(T Item) \
{ wxBaseArray::Add((long)Item); } \
void Insert(T Item, size_t uiIndex) \
{ wxBaseArray::Insert((long)Item, uiIndex) ; } \
\
void Remove(size_t uiIndex) { wxBaseArray::Remove(uiIndex); } \
void Remove(T Item) \
{ int iIndex = Index(Item); \
wxCHECK2_MSG( iIndex != NOT_FOUND, return, \
"removing inexisting element in wxArray::Remove" ); \
wxBaseArray::Remove((size_t)iIndex); } \
\
void Sort(CMPFUNC##T fCmp) { wxBaseArray::Sort((CMPFUNC)fCmp); } \
}
// ----------------------------------------------------------------------------
// This is the same as the previous macro, but it defines a sorted array.
// Differences:
// 1) it must be given a COMPARE function in ctor which takes 2 items of type
// T* and should return -1, 0 or +1 if the first one is less/greater
// than/equal to the second one.
// 2) the Add() method inserts the item in such was that the array is always
// sorted (it uses the COMPARE function)
// 3) it has no Sort() method because it's always sorted
// 4) Index() method is much faster (the sorted arrays use binary search
// instead of linear one), but Add() is slower.
//
// Summary: use this class when the speed of Index() function is important, use
// the normal arrays otherwise.
//
// NB: it has only inline functions => takes no space at all
// ----------------------------------------------------------------------------
#define _WX_DEFINE_SORTED_ARRAY(T, name) \
typedef int (CMPFUNC_CONV *SCMPFUNC##T)(T pItem1, T pItem2); \
class WXDLLEXPORTLOCAL name : public wxBaseArray \
{ \
public: \
name(SCMPFUNC##T fn) \
{ wxASSERT( sizeof(T) <= sizeof(long) ); m_fnCompare = fn; } \
\
name& operator=(const name& src) \
{ ((wxBaseArray *)this)->operator=((const wxBaseArray&)src); \
m_fnCompare = src.m_fnCompare; \
return *this; } \
\
T& operator[](size_t uiIndex) const \
{ return (T&)(wxBaseArray::Item(uiIndex)); } \
T& Item(size_t uiIndex) const \
{ return (T&)(wxBaseArray::Item(uiIndex)); } \
T& Last() const \
{ return (T&)(wxBaseArray::Item(Count() - 1)); } \
\
int Index(T Item) const \
{ return wxBaseArray::Index((long)Item, (CMPFUNC)m_fnCompare); }\
\
void Add(T Item) \
{ wxBaseArray::Add((long)Item, (CMPFUNC)m_fnCompare); } \
\
void Remove(size_t uiIndex) { wxBaseArray::Remove(uiIndex); } \
void Remove(T Item) \
{ int iIndex = Index(Item); \
wxCHECK2_MSG( iIndex != NOT_FOUND, return, \
"removing inexisting element in wxArray::Remove" ); \
wxBaseArray::Remove((size_t)iIndex); } \
\
private: \
SCMPFUNC##T m_fnCompare; \
}
// ----------------------------------------------------------------------------
// see WX_DECLARE_OBJARRAY and WX_DEFINE_OBJARRAY
// ----------------------------------------------------------------------------
#define _WX_DECLARE_OBJARRAY(T, name) \
typedef int (CMPFUNC_CONV *CMPFUNC##T)(T** pItem1, T** pItem2); \
class WXDLLEXPORTLOCAL name : public wxBaseArray \
{ \
public: \
name() { } \
name(const name& src); \
name& operator=(const name& src); \
\
~name(); \
\
T& operator[](size_t uiIndex) const \
{ return *(T*)wxBaseArray::Item(uiIndex); } \
T& Item(size_t uiIndex) const \
{ return *(T*)wxBaseArray::Item(uiIndex); } \
T& Last() const \
{ return *(T*)(wxBaseArray::Item(Count() - 1)); } \
\
int Index(const T& Item, bool bFromEnd = FALSE) const; \
\
void Add(const T& Item); \
void Add(const T* pItem) \
{ wxBaseArray::Add((long)pItem); } \
\
void Insert(const T& Item, size_t uiIndex); \
void Insert(const T* pItem, size_t uiIndex) \
{ wxBaseArray::Insert((long)pItem, uiIndex); } \
\
void Empty(); \
\
T* Detach(size_t uiIndex) \
{ T* p = (T*)wxBaseArray::Item(uiIndex); \
wxBaseArray::Remove(uiIndex); return p; } \
void Remove(size_t uiIndex); \
\
void Sort(CMPFUNC##T fCmp) { wxBaseArray::Sort((CMPFUNC)fCmp); } \
\
private: \
void DoCopy(const name& src); \
}
// ----------------------------------------------------------------------------
/** @name Macros for definition of dynamic arrays and objarrays
These macros are ugly (especially if you look in the sources ;-), but they
allow us to define 'template' classes without actually using templates.
<BR>
<BR>
Range checking is performed in debug build for both arrays and objarrays.
Type checking is done at compile-time. Warning: arrays <I>never</I> shrink,
they only grow, so loading 10 millions in an array only to delete them 2
lines below is <I>not</I> recommended. However, it does free memory when
it's destroyed, so if you destroy array also, it's ok.
*/
// ----------------------------------------------------------------------------
//@{
/**
This macro generates a new array class. It is intended for storage of simple
types of sizeof()<=sizeof(long) or pointers if sizeof(pointer)<=sizeof(long)
<BR>
NB: it has only inline functions => takes no space at all
<BR>
@memo declare and define array class 'name' containing elements of type 'T'
*/
#define WX_DEFINE_ARRAY(T, name) typedef T _A##name; \
_WX_DEFINE_ARRAY(_A##name, name)
/**
This macro does the same as WX_DEFINE_ARRAY except that the array will be
sorted with the specified compare function.
*/
#define WX_DEFINE_SORTED_ARRAY(T, name) typedef T _A##name; \
_WX_DEFINE_SORTED_ARRAY(_A##name, name)
/**
This macro generates a new objarrays class which owns the objects it
contains, i.e. it will delete them when it is destroyed. An element is of
type T*, but arguments of type T& are taken (see below!) and T& is
returned. <BR>
Don't use this for simple types such as "int" or "long"!
You _may_ use it for "double" but it's awfully inefficient.
<BR>
<BR>
Note on Add/Insert functions:
<BR>
1) function(T*) gives the object to the array, i.e. it will delete the
object when it's removed or in the array's dtor
<BR>
2) function(T&) will create a copy of the object and work with it
<BR>
<BR>
Also:
<BR>
1) Remove() will delete the object after removing it from the array
<BR>
2) Detach() just removes the object from the array (returning pointer to it)
<BR>
<BR>
NB1: Base type T should have an accessible copy ctor if Add(T&) is used,
<BR>
NB2: Never ever cast a array to it's base type: as dtor is <B>not</B> virtual
it will provoke memory leaks
<BR>
<BR>
some functions of this class are not inline, so it takes some space to
define new class from this template.
@memo declare objarray class 'name' containing elements of type 'T'
*/
#define WX_DECLARE_OBJARRAY(T, name) typedef T _L##name; \
_WX_DECLARE_OBJARRAY(_L##name, name)
/**
To use an objarray class you must
<ll>
<li>#include "dynarray.h"
<li>WX_DECLARE_OBJARRAY(element_type, list_class_name)
<li>#include "arrimpl.cpp"
<li>WX_DEFINE_OBJARRAY(list_class_name) // same as above!
</ll>
<BR><BR>
This is necessary because at the moment of DEFINE_OBJARRAY class
element_type must be fully defined (i.e. forward declaration is not
enough), while WX_DECLARE_OBJARRAY may be done anywhere. The separation of
two allows to break cicrcular dependencies with classes which have member
variables of objarray type.
@memo define (must include arrimpl.cpp!) objarray class 'name'
*/
#define WX_DEFINE_OBJARRAY(name) "don't forget to include arrimpl.cpp!"
//@}
// ----------------------------------------------------------------------------
/** @name Some commonly used predefined arrays */
// # overhead if not used?
// ----------------------------------------------------------------------------
#define WXDLLEXPORTLOCAL WXDLLEXPORT
//@{
/** @name ArrayInt */
WX_DEFINE_ARRAY(int, wxArrayInt);
/** @name ArrayLong */
WX_DEFINE_ARRAY(long, wxArrayLong);
/** @name ArrayPtrVoid */
WX_DEFINE_ARRAY(void *, wxArrayPtrVoid);
//@}
//@}
#undef WXDLLEXPORTLOCAL
#define WXDLLEXPORTLOCAL
// -----------------------------------------------------------------------------
// convinience macros
// -----------------------------------------------------------------------------
// delete all array elements
//
// NB: the class declaration of the array elements must be visible from the
// place where you use this macro, otherwise the proper destructor may not
// be called (a decent compiler should give a warning about it, but don't
// count on it)!
#define WX_CLEAR_ARRAY(array) \
{ \
size_t count = array.Count(); \
for ( size_t n = 0; n < count; n++ ) \
{ \
delete array[n]; \
} \
\
array.Empty(); \
}
#endif // _DYNARRAY_H
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