runtime template mode processor, C++ (gcc)

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//g++  5.4.0

#include <iostream>

#include <boost/algorithm/string.hpp>
#include <boost/program_options.hpp>

namespace po = boost::program_options;

template<int> class Processor{};

enum Modes
{
    md_tolower = 1,
    md_toupper = 2,
    md_capitalize = 4,
    md_trim_start = 8,
    md_trim_end = 16,
    md_normalize_spaces = 32,
    md_stem = 64,
    md_sort = 128,    
};

template<> class Processor<md_tolower>{
public:
    std::string operator()(std::string&& s) const
    {
        boost::to_lower(s);
        return s;
    }
};

template<> class Processor<md_toupper>{
public:
    std::string operator()(std::string&& s) const
    {
        boost::to_upper(s);
        return s;
    }
};

template<> class Processor<md_capitalize>{
public:
    std::string operator()(std::string&& s) const
    {
        return s;
    }
};

template<> class Processor<md_trim_start>{
public:
    std::string operator()(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<md_trim_end>{
public:
    std::string operator()(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<md_normalize_spaces>{
public:
    std::string operator()(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<md_stem>{
public:
    std::string operator()(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<md_sort>{
public:
    std::string operator()(std::string&& s) const
    {
        return s; // TODO
    }
};

int main()
{
    int mode = 0;
    po::options_description config_option_list("config options");
	config_option_list.add_options()
		("mode", po::value<int>(&mode)->default_value(0), "")
    ;

}

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Compilation time: 2.84 sec, absolute service time: 2,85 sec