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wxBaseArray::Shrink() added

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@754 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
1998-09-18 21:35:44 +00:00
parent 50414e24a7
commit 3093cef829
2 changed files with 93 additions and 76 deletions
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125
src/common/dynarray.cpp
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@@ -51,20 +51,20 @@
// ctor
wxBaseArray::wxBaseArray()
{
m_uiSize =
m_uiCount = 0;
m_nSize =
m_nCount = 0;
m_pItems = (long *) NULL;
}
// copy ctor
wxBaseArray::wxBaseArray(const wxBaseArray& src)
{
m_uiSize = // not src.m_uiSize to save memory
m_uiCount = src.m_uiCount;
m_nSize = // not src.m_nSize to save memory
m_nCount = src.m_nCount;
if ( m_uiSize != 0 ) {
m_pItems = new long[m_uiSize];
memcpy(m_pItems, src.m_pItems, m_uiCount*sizeof(long));
if ( m_nSize != 0 ) {
m_pItems = new long[m_nSize];
memcpy(m_pItems, src.m_pItems, m_nCount*sizeof(long));
}
else
m_pItems = (long *) NULL;
@@ -82,12 +82,12 @@ wxBaseArray& wxBaseArray::operator=(const wxBaseArray& src)
}
#endif
m_uiSize = // not src.m_uiSize to save memory
m_uiCount = src.m_uiCount;
m_nSize = // not src.m_nSize to save memory
m_nCount = src.m_nCount;
if ( m_uiSize != 0 ) {
m_pItems = new long[m_uiSize];
memcpy(m_pItems, src.m_pItems, m_uiCount*sizeof(long));
if ( m_nSize != 0 ) {
m_pItems = new long[m_nSize];
memcpy(m_pItems, src.m_pItems, m_nCount*sizeof(long));
}
else
m_pItems = (long *) NULL;
@@ -99,24 +99,24 @@ wxBaseArray& wxBaseArray::operator=(const wxBaseArray& src)
void wxBaseArray::Grow()
{
// only do it if no more place
if( m_uiCount == m_uiSize ) {
if( m_uiSize == 0 ) {
if( m_nCount == m_nSize ) {
if( m_nSize == 0 ) {
// was empty, alloc some memory
m_uiSize = WX_ARRAY_DEFAULT_INITIAL_SIZE;
m_pItems = new long[m_uiSize];
m_nSize = WX_ARRAY_DEFAULT_INITIAL_SIZE;
m_pItems = new long[m_nSize];
}
else
{
// add 50% but not too much
size_t uiIncrement = m_uiSize < WX_ARRAY_DEFAULT_INITIAL_SIZE
? WX_ARRAY_DEFAULT_INITIAL_SIZE : m_uiSize >> 1;
if ( uiIncrement > ARRAY_MAXSIZE_INCREMENT )
uiIncrement = ARRAY_MAXSIZE_INCREMENT;
m_uiSize += uiIncrement;
long *pNew = new long[m_uiSize];
size_t nIncrement = m_nSize < WX_ARRAY_DEFAULT_INITIAL_SIZE
? WX_ARRAY_DEFAULT_INITIAL_SIZE : m_nSize >> 1;
if ( nIncrement > ARRAY_MAXSIZE_INCREMENT )
nIncrement = ARRAY_MAXSIZE_INCREMENT;
m_nSize += nIncrement;
long *pNew = new long[m_nSize];
// copy data to new location
memcpy(pNew, m_pItems, m_uiCount*sizeof(long));
memcpy(pNew, m_pItems, m_nCount*sizeof(long));
delete [] m_pItems;
m_pItems = pNew;
}
@@ -132,44 +132,59 @@ wxBaseArray::~wxBaseArray()
// clears the list
void wxBaseArray::Clear()
{
m_uiSize =
m_uiCount = 0;
m_nSize =
m_nCount = 0;
wxDELETEA(m_pItems);
}
// pre-allocates memory (frees the previous data!)
void wxBaseArray::Alloc(size_t uiSize)
void wxBaseArray::Alloc(size_t nSize)
{
wxASSERT( uiSize > 0 );
wxASSERT( nSize > 0 );
// only if old buffer was not big enough
if ( uiSize > m_uiSize ) {
if ( nSize > m_nSize ) {
wxDELETEA(m_pItems);
m_pItems = new long[uiSize];
m_uiSize = uiSize;
m_pItems = new long[nSize];
m_nSize = nSize;
}
m_uiCount = 0;
m_nCount = 0;
}
// minimizes the memory usage by freeing unused memory
void wxBaseArray::Shrink()
{
// only do it if we have some memory to free
if( m_nCount < m_nSize ) {
// allocates exactly as much memory as we need
long *pNew = new long[m_nCount];
// copy data to new location
memcpy(pNew, m_pItems, m_nCount*sizeof(long));
delete [] m_pItems;
m_pItems = pNew;
}
}
// searches the array for an item (forward or backwards)
int wxBaseArray::Index(long lItem, bool bFromEnd) const
{
if ( bFromEnd ) {
if ( m_uiCount > 0 ) {
size_t ui = m_uiCount;
if ( m_nCount > 0 ) {
size_t n = m_nCount;
do {
if ( m_pItems[--ui] == lItem )
return ui;
if ( m_pItems[--n] == lItem )
return n;
}
while ( ui != 0 );
while ( n != 0 );
}
}
else {
for( size_t ui = 0; ui < m_uiCount; ui++ ) {
if( m_pItems[ui] == lItem )
return ui;
for( size_t n = 0; n < m_nCount; n++ ) {
if( m_pItems[n] == lItem )
return n;
}
}
@@ -181,7 +196,7 @@ int wxBaseArray::Index(long lItem, CMPFUNC fnCompare) const
{
size_t i,
lo = 0,
hi = m_uiCount;
hi = m_nCount;
int res;
while ( lo < hi ) {
@@ -202,7 +217,7 @@ int wxBaseArray::Index(long lItem, CMPFUNC fnCompare) const
void wxBaseArray::Add(long lItem)
{
Grow();
m_pItems[m_uiCount++] = lItem;
m_pItems[m_nCount++] = lItem;
}
// add item assuming the array is sorted with fnCompare function
@@ -210,7 +225,7 @@ void wxBaseArray::Add(long lItem, CMPFUNC fnCompare)
{
size_t i,
lo = 0,
hi = m_uiCount;
hi = m_nCount;
int res;
while ( lo < hi ) {
@@ -233,26 +248,26 @@ void wxBaseArray::Add(long lItem, CMPFUNC fnCompare)
}
// add item at the given position
void wxBaseArray::Insert(long lItem, size_t uiIndex)
void wxBaseArray::Insert(long lItem, size_t nIndex)
{
wxCHECK_RET( uiIndex <= m_uiCount, _("bad index in wxArray::Insert") );
wxCHECK_RET( nIndex <= m_nCount, "bad index in wxArray::Insert" );
Grow();
memmove(&m_pItems[uiIndex + 1], &m_pItems[uiIndex],
(m_uiCount - uiIndex)*sizeof(long));
m_pItems[uiIndex] = lItem;
m_uiCount++;
memmove(&m_pItems[nIndex + 1], &m_pItems[nIndex],
(m_nCount - nIndex)*sizeof(long));
m_pItems[nIndex] = lItem;
m_nCount++;
}
// removes item from array (by index)
void wxBaseArray::Remove(size_t uiIndex)
void wxBaseArray::Remove(size_t nIndex)
{
wxCHECK_RET( uiIndex <= m_uiCount, _("bad index in wxArray::Remove") );
wxCHECK_RET( nIndex <= m_nCount, "bad index in wxArray::Remove" );
memmove(&m_pItems[uiIndex], &m_pItems[uiIndex + 1],
(m_uiCount - uiIndex - 1)*sizeof(long));
m_uiCount--;
memmove(&m_pItems[nIndex], &m_pItems[nIndex + 1],
(m_nCount - nIndex - 1)*sizeof(long));
m_nCount--;
}
// removes item from array (by value)
@@ -261,7 +276,7 @@ void wxBaseArray::Remove(long lItem)
int iIndex = Index(lItem);
wxCHECK_RET( iIndex != NOT_FOUND,
_("removing inexistent item in wxArray::Remove") );
"removing inexistent item in wxArray::Remove" );
Remove((size_t)iIndex);
}
@@ -269,5 +284,5 @@ void wxBaseArray::Remove(long lItem)
// sort array elements using passed comparaison function
void wxBaseArray::Sort(CMPFUNC fCmp)
{
qsort(m_pItems, m_uiCount, sizeof(long), fCmp);
qsort(m_pItems, m_nCount, sizeof(long), fCmp);
}