runtime template mode processor , C++ (gcc)

runtime template mode processor

Language: Layout:

//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: 4.39 sec, absolute service time: 4,4 sec

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Error(s):

source_file.cpp:14:15: error: ‘tolower’ redeclared as different kind of symbol
     tolower = 1,
               ^
In file included from /usr/include/c++/5/cctype:42:0,
                 from /usr/include/c++/5/bits/localefwd.h:42,
                 from /usr/include/c++/5/ios:41,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from source_file.cpp:3:
/usr/include/ctype.h:124:12: note: previous declaration ‘int tolower(int)’
 extern int tolower (int __c) __THROW;
            ^
source_file.cpp:15:15: error: ‘toupper’ redeclared as different kind of symbol
     toupper = 2,
               ^
In file included from /usr/include/c++/5/cctype:42:0,
                 from /usr/include/c++/5/bits/localefwd.h:42,
                 from /usr/include/c++/5/ios:41,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from source_file.cpp:3:
/usr/include/ctype.h:127:12: note: previous declaration ‘int toupper(int)’
 extern int toupper (int __c) __THROW;
            ^
source_file.cpp:26:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^
source_file.cpp:35:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^
source_file.cpp:44:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^
source_file.cpp:52:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^
source_file.cpp:60:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^
source_file.cpp:68:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^
source_file.cpp:76:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^
source_file.cpp:84:25: error: expected type-specifier before ‘(’ token
     std::string operator(std::string&& s) const
                         ^

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