itoa.hpp

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#ifndef RITSUKO_ITOA_HPP
#define RITSUKO_ITOA_HPP
 
#include <string>
#include <algorithm>
#include <type_traits>
 
namespace ritsuko {
 
template<typename Integer_>
void itoa(Integer_ x, std::string& output) {
    static_assert(std::is_integral<Integer_>::value);
    if (x > 0) {
        const auto sofar = output.size();
        while (x) {
            output += static_cast<char>('0' + x % 10);
            x /= 10;
        }
        std::reverse(output.begin() + sofar, output.end());
    } else if (x == 0) {
        output += '0';
    } else {
        output += '-';
        const auto sofar = output.size();
        while (x) {
            output += static_cast<char>('0' - (x % 10));
            x /= 10;
        }
        std::reverse(output.begin() + sofar, output.end());
    }
}
 
template<typename Integer_>
std::string itoa(Integer_ x) {
    std::string output;
    itoa(x, output);
    return output;
}
 
}
 
#endif