Re: return value
Carmen Sei wrote:
Then C++ programmer most of time will pass in a reference (SYSTEMTIME&
st) most of time for passing value back to caller function?
bool Table::Get(char* FieldName, SYSTEMTIME& st)
{
_variant_t vtValue;
vtValue = m_Rec->Fields->GetItem(FieldName)->GetValue();
if (vtValue.vt == VT_NULL) {
return false;
}
VariantTimeToSystemTimeWithMilliseconds (vtValue.date, &st);
return true;
}
=====================
another way to do this is -
SYSTEMTIME* Table::Get(char* FieldName)
=====================
but the following is better way for returning value back to caller
function and most programmer do this way??
bool Table::Get(char* FieldName, SYSTEMTIME& st)
The reason pass-by-reference is better than return is that the caller both
allocates and frees the memory, so any allocator can be used. When
returning a pointer, the callee allocates but the caller frees, and this is
an opportunity for trouble if the caller doesn't free using the right
allocator.