Question

Possible Duplicate:
Case insensitive string comparison in C++
C++ count and map

How to do case insensitive count in C++ without using tolower. I want to count words irrespective of their case, but do not want to use tolower. Any other solution in C++?

Answer 1

You can use as std::map with a custom comparer function object that is case insensitive

struct StrCaseInsensitive
{
    bool operator() (const string& left , const string& right )
    {
        return _stricmp( left.c_str() , right.c_str() ) < 0;
    }
};

int main(void)
{
    char* input[] = { "Foo" , "bar" , "Bar" , "FOO" };
    std::map<string, int , StrCaseInsensitive> CountMap;

    for( int i = 0 ; i < 4; ++i )
    {
        CountMap[ input[i] ] += 1;
    }
    return 0;
}