How can I make the map::find operation case insensitive?

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野的像风 2020-12-01 00:23

Does the map::find method support case insensitive search? I have a map as follows:

map > directory;
<

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醉梦人生 (楼主)

2020-12-01 00:52

For C++11 and beyond:

#include 
#include 
#include 

namespace detail
{

struct CaseInsensitiveComparator
{
    bool operator()(const std::string& a, const std::string& b) const noexcept
    {
        return ::strcasecmp(a.c_str(), b.c_str()) < 0;
    }
};

}   // namespace detail


template 
using CaseInsensitiveMap = std::map;



int main(int argc, char* argv[])
{
    CaseInsensitiveMap m;

    m["one"] = 1;
    std::cout << m.at("ONE") << "\n";

    return 0;
}

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