Unordered_set TCHAR * requirements?

Question

I want to use a data structure that serves as a .Net HashSet, I tried using unordered_set with the default hashing method and user mapping as follows:

struct comparer
    {
        bool operator()( const TCHAR* first,const TCHAR* second) const
        {   
            return _tcscmp((TCHAR*)first,(TCHAR*)second) == 0;
        }
    };

    typedef unordered_set<const TCHAR*,hash<const TCHAR*>,comparer> HashSet;

the problem is that when I tried to use a HashtSet to search for a specific key (using the method find) that I just added with insert, it returns HashSet::end()!!

Could you explain what the problem is? I am using VC ++ under VS2010

Answer 1

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