runtime template mode processor , C++ (gcc)

runtime template mode processor

//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
{
    tolower = 1,
    toupper = 2,
    capitalize = 4,
    trim_start = 8,
    trim_end = 16,
    normalize_spaces = 32,
    stem = 64,
    sort = 128,    
};

template<> class Processor<1>{
public:
    std::string operator(std::string&& s) const
    {
        boost::to_lower(s);
        return s;
    }
};

template<> class Processor<2>{
public:
    std::string operator(std::string&& s) const
    {
        boost::to_upper(s);
        return s;
    }
};

template<> class Processor<4>{
public:
    std::string operator(std::string&& s) const
    {
        return s;
    }
};

template<> class Processor<8>{
public:
    std::string operator(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<16>{
public:
    std::string operator(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<32>{
public:
    std::string operator(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<64>{
public:
    std::string operator(std::string&& s) const
    {
        return s; // TODO
    }
};

template<> class Processor<128>{
public:
    std::string operator(std::string&& s) const
    {
        return s; // TODO
    }
};

int main()
{
    int mode;
    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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