string-functions.hpp

#pragma once

#include <string>

static inline std::string hexadecimal( const std::string& input ) {
    static const char* const TRANSLATION = "0123456789ABCDEF";
    size_t length = input.length();

    std::string output;
    output.reserve( 2 * length );
    for( size_t i = 0; i < length; i++ ) {
        const unsigned char c = input[ i ];
        output.push_back( TRANSLATION[ c >> 4 ] );
        output.push_back( TRANSLATION[ c & 0x0F ] );
    }

    return output;
}