File: stridx.cc

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#include <string>
#include <map>

//stridx
template <typename Type>
concept HasStrIndex =
    requires(Type tp)
    {
        tp[std::string{}];
    };

template <HasStrIndex Type>
auto value(Type &obj, std::string const &key)
{
    return obj[key];
}

int main()
{
    std::map<std::string, double> msd;
    value(msd, "hi");
}
//=