c++模板获取函数签名

#include 
#include 
#include 

using M3Result = const char*;

namespace cc {
        template
        struct m3_sig {
            static const char value = c;
        };
        template struct m3_type_to_sig;
        template<> struct m3_type_to_sig : m3_sig<'i'> {};
        template<> struct m3_type_to_sig : m3_sig<'I'> {};
        template<> struct m3_type_to_sig   : m3_sig<'f'> {};
        template<> struct m3_type_to_sig  : m3_sig<'F'> {};
        template<> struct m3_type_to_sig    : m3_sig<'v'> {};
        template<> struct m3_type_to_sig  : m3_sig<'*'> {};
        template<> struct m3_type_to_sig : m3_sig<'*'> {};


        template
        struct m3_signature {
            constexpr static size_t n_args = sizeof...(Args);
            constexpr static const char value[sizeof...(Args) + 4]             
            = {
                    m3_type_to_sig::value,
                    '(',
                    m3_type_to_sig::value...,
                    ')',
                    0
            };
        };


        template
        constexpr const char m3_signature::value[sizeof...(Args) + 4];
}

template
class Wrapper;

template
class Wrapper {
public:
    static M3Result link() {
        return cc::m3_signature::value;
    }
};


class Module {
public:
    template
    M3Result link(Func *function) {
        M3Result ret = Wrapper::link();
        return ret;
    }
};


void* Test(int, float) {
  return 0;
}


int main() {
  Module m;
  std::cout << m.link(Test) << std::endl; // *(if)
  return 0;
}