Uniqueness Check

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Function hasUniqueChars2
Args - std::string
Output:: True if string has all characters which are unique

     False if string has at least one repeated char.

Assumption:: string only contains (a..z), 26 chars. */

#include<iostream>
#include<string>
using namespace std;
bool hasUniqueChars2( std::string str)
{
    int check = 0;
    int len = str.length();
    for (int i = 0; i < len; ++i)
    {
        int c = (int)(str[i] - 'a');
        cout << c << endl;
        if ( check & ( 1 << c ) ) {
            return false;
        }
        check |= ( 1 << c);
    }
    return true;
}
int main()
{
    std::string in="abbc";
    cout << hasUniqueChars2(in) << endl;
}

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