c++ case insensitive count in C++

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++?

If you do not use `tolower`, then you will probably have to implement some equivalent function yourself. Why this restriction? — Björn Pollex, Nov 09 '11 at 07:44
Didn't you just asked it?! "http://stackoverflow.com/questions/8061317/c-count-and-map" — Roee Gavirel, Nov 09 '11 at 07:51
And [this](http://stackoverflow.com/questions/4291476/case-insensitive-stdset-of-strings/4291497#4291497) may help. — Yakov Galka, Nov 09 '11 at 07:52

parapura rajkumar · Accepted Answer · 2011-11-09T07:57:15.113

2

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;
}

edited Nov 09 '11 at 07:57

answered Nov 09 '11 at 07:48

parapura rajkumar

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I think the question is about implementing that comparer function you speak of... – Luchian Grigore Nov 09 '11 at 07:49
I was editing the post with an example – parapura rajkumar Nov 09 '11 at 07:58
Why not just write the function the first time around? – Luchian Grigore Nov 09 '11 at 08:01

score 2 · Answer 2 · edited May 23 '17 at 12:11

2

If you don't want to use tolower, there's always toupper, which works just as well.

You don't have to store the string in lowercase, you can just compare in lowercase.

Or you can use strcasecmp or stricmp if it's available.

Or you can use someone else's solution.

edited May 23 '17 at 12:11

Community

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answered Nov 09 '11 at 07:56

tylerl

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c++ case insensitive count in C++

2 Answers2