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added wxArray::SetCount()

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18930 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2003-01-25 23:47:33 +00:00
parent 0bbe4e299c
commit 2abb9d2f17
3 changed files with 62 additions and 14 deletions
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50
src/common/dynarray.cpp
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@@ -106,6 +106,23 @@ name& name::operator=(const name& src) \
return *this; \
} \
\
/* allocate new buffer of the given size and move our data to it */ \
bool name::Realloc(size_t nSize) \
{ \
T *pNew = new T[nSize]; \
/* only grow if allocation succeeded */ \
if ( !pNew ) \
return false; \
\
m_nSize = nSize; \
/* copy data to new location */ \
memcpy(pNew, m_pItems, m_nCount*sizeof(T)); \
delete [] m_pItems; \
m_pItems = pNew; \
\
return true; \
} \
\
/* grow the array */ \
void name::Grow(size_t nIncrement) \
{ \
@@ -131,19 +148,34 @@ void name::Grow(size_t nIncrement) \
ndefIncrement = ARRAY_MAXSIZE_INCREMENT; \
if ( nIncrement < ndefIncrement ) \
nIncrement = ndefIncrement; \
T *pNew = new T[m_nSize + nIncrement]; \
/* only grow if allocation succeeded */ \
if ( pNew ) { \
m_nSize += nIncrement; \
/* copy data to new location */ \
memcpy(pNew, m_pItems, m_nCount*sizeof(T)); \
delete [] m_pItems; \
m_pItems = pNew; \
} \
Realloc(m_nSize + nIncrement); \
} \
} \
} \
\
/* make sure that the array has at least count elements */ \
void name::SetCount(size_t count, T defval) \
{ \
if ( m_nSize < count ) \
{ \
/* need to realloc memory: don't overallocate it here as if */ \
/* SetCount() is called, it probably means that the caller */ \
/* knows in advance how many elements there will be in the */ \
/* array and so it won't be necessary to realloc it later */ \
if ( !Realloc(count) ) \
{ \
/* out of memory -- what can we do? */ \
return; \
} \
} \
\
/* add new elements if we extend the array */ \
while ( m_nCount < count ) \
{ \
m_pItems[m_nCount++] = defval; \
} \
} \
\
/* dtor */ \
name::~name() \
{ \