c++11: calculate base name of __FILE__ at compile time

baseName.cc

#include <iostream>

template<std::size_t Len>
constexpr const char* baseNameImpl(const char(&str)[Len], std::size_t pos)
{
    return pos==0 ? str : (str[pos] == '/' || str[pos] == '\\') ? str+pos+1 : baseNameImpl(str, --pos);
}

template<std::size_t Len>
constexpr const char* baseName(const char(&str)[Len])
{
    return baseNameImpl(str, Len-1);
}

int main()
{
    std::cout << baseName(__FILE__) << std::endl;
    return 0;
}