ctfuncmap.cpp

/**
 * @file   ctfuncmap.cpp
 * @author Jens Munk Hansen <jmh@debian9laptop.parknet.dk>
 * @date   Wed Feb 19 18:42:20 2020
 *
 * @brief
 *
 * Copyright 2020
 *
 */

#include <iostream>
#include <map>
#include <string>

// Same prototype, but different names

using Map = std::map<std::string, int(*)()>;


//-------------------------------------//

template<int(*)()>
struct Get {
  static constexpr std::string name() {
    std::string tmp = __PRETTY_FUNCTION__;
    auto s = tmp.find("= ");
    auto e = tmp.find("; ");
    return std::string(tmp.substr(s+2, e-s-2));
  }
};

template<int(*func)()>
void insert2map(Map &fctmap) {
  fctmap[Get<func>::name()] = func;
}

int first() {
  return 0;
}

int second() {
  return 1;
}

template<char... N> struct interned {
  using type = interned;
  static char const value[];
};

template<char... N> char const interned<N...>::value[] {N...};

template<int N>
constexpr char ch(char const(&s)[N], int i) {
  return i < N ? s[i] : '\0';
}

#define intern_t(s) interned<ch(s,0), ch(s,1), ch(s,2), ch(s,3), ch(s,4), ch(s,5), ch(s,6), ch(s,7), ch(s,8), ch(s, 9), ch(s, 10), ch(s, 11), ch(s,12), ch(s,13), ch(s,14), ch(s,15, ch(s,16), ch(s,17)>::type;


class A {
 public:
  A() {
  }
  ~A() {
  }

  int fun(float f) {
    int retval = static_cast<int>(f);
    std::cout << __PRETTY_FUNCTION__ << std::endl;
    return retval;
  }
  int bla() {
    return 0;
  }
};





int main(int arc, char* argv[]) {
  A a;

  int k = a.fun(1.0f);

  Map fctmap;

  insert2map<first>(fctmap);
  insert2map<second>(fctmap);

  for (auto &&i : fctmap)
    std::cout << i.first << " -> " << i.second() << std::endl;


  // intern_t("db")::value
  return 0;
}