Case-insensitive string comparison in C++ [closed]

Answer 1

Late to the party, but here is a variant that uses std::locale, and thus correctly handles Turkish:

auto tolower = std::bind1st(
    std::mem_fun(
        &std::ctype::tolower),
    &std::use_facet >(
        std::locale()));

gives you a functor that uses the active locale to convert characters to lowercase, which you can then use via std::transform to generate lower-case strings:

std::string left = "fOo";
transform(left.begin(), left.end(), left.begin(), tolower);

This also works for wchar_t based strings.