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Regarding the C++ STL map, erasing by key:-
size_type map::erase ( const key_type& x ); Is it legal to erase a non-existing key? i.e. is the snippet below ok?
map<char,int> mymap; mymap['c']=30; mymap.erase('c'); mymap.erase('c'); mymap.erase('D'); Cheers
Yes, in fact,
std::map::erase()returns a size_type which indicates the number of keys erased. Thus it returns 0 for nothing erased and 1 for something erased for a map.