How do I force wxObject to be wxVariant?
I have a wxObject..but map, I want it to be convertible to wxVariant.
void MWDataViewTable::InitColumnValues(wxString targetcolumn,wxString sourcecolumn , std::map<wxObject,wxObject> srctargetvalue)
{
wxVariant srcvalue;
wxVariant tgtvalue;
int srccolumnpos = GetColumnPosition(sourcecolumn);
int tgtcolumnpos = GetColumnPosition(targetcolumn);
int rows = m_rowdataList.size()-1; //without header
for(int i=0;i< rows;i++)
{
GetValue(srcvalue,i,srccolumnpos);
tgtvalue = (wxVariant)srctargetvalue[srcvalue] ;// typecasting
SetValue(tgtvalue,i,tgtcolumnpos/*toggle-column*/);
}
}
On the highlighted line, I do typecasting..but which gives me an error that says "Error 1 error C2678: binary '<': operator not found which takes left operand of type 'const wxObject'" this error goes to file xstddef.h ... I do not know why this is happening, or if I am mistakenly wrong. Help me please..!
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In std::map
, key values are generally used to sort and uniquely identify the elements
.
In your code, both keys and values are of type wxObject
. The class wxObject
doesn't seem to overload the less operator method (I have no idea what these wx objects are).
std::map
a method is required less operator
to perform the comparison required to sort the key values. Therefore, you must either pass your own comparison function to std :: map that would compare the two wxObjects.
The std :: map template container accepts a compare function as a third application.
template < class Key, // map::key_type
class T, // map::mapped_type
class Compare = less<Key>, // map::key_compare
class Alloc = allocator<pair<const Key,T> > // map::allocator_type
> class map;
Comparison is a binary predicate that will have the following definition in your case:
bool MyCompare( const wxObject& , const wxObject&)
{
\\Compare logic that returns true or false
}
You can have your own map that uses this comparison method:
typedef std::map<wxObject,wxObject,&MyCompare> MyMap;
MyMap srctargetvalue;
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