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| #include <functional>
#include <iostream>
#include <string>
#include <map>
#include <memory>
class FctBase;
template <class Ret, class... Args>
class Fct;
class FctBase {
// oui c'est sale :/
virtual void virtualFctPourDynamicCast() { }
public:
template<class Ret, class... Args>
Ret doJob(Args... args) const {
const Fct<Ret, Args...> *_this = dynamic_cast<const Fct<Ret, Args...>*>(this);
if(!_this) {
throw std::exception();
}
return _this->call(args...);
}
};
template <class Ret, class... Args>
class Fct: public FctBase {
const std::function<Ret(Args...)> m_fct;
public:
Fct(const std::function<Ret(Args...)> fct):
m_fct(fct)
{ }
~Fct() { }
Ret call(Args... args) const {
return m_fct(args...);
};
};
template <class Ret, class... Args>
Ret call(const Fct<Ret, Args...> *fct, Args... args) {
return fct->call(args...);
}
int main(int argc, char** argv) {
typedef std::unique_ptr<FctBase> ptr;
std::map<std::string, ptr> fctMap;
auto fct1 = [](int i, int j)->int { return i+j; };
auto fct2 = [](char c)->float { return c/255.f; };
// insert
fctMap.insert(std::make_pair("fct1", ptr(new Fct<int, int, int>(fct1))));
fctMap.insert(std::make_pair("fct2", ptr(new Fct<float, char>(fct2))));
// recherche et exec si trouvé
auto itFct1 = fctMap.find("fct1");
if(itFct1 != fctMap.end()) {
try {
int ret = itFct1->second->doJob<int, int, int>(1, 2);
std::cout << "fct1(1, 2) = " << ret << std::endl;
}
catch(...) {
std::cout << "fct1(1, 2) fail\n";
}
}
auto itFct2 = fctMap.find("fct2");
if(itFct2 != fctMap.end()) {
try {
float ret = itFct2->second->doJob<float, char>('h');
std::cout << "fct2('h') = " << ret << std::endl;
}
catch(...) {
std::cout << "fct2('h') fail\n";
}
}
// mauvais appel
if(itFct1 != fctMap.end()) {
try {
int ret = itFct1->second->doJob<int, char>('h');
std::cout << "fct1('h') = " << ret << std::endl;
}
catch(...) {
std::cout << "fct1('h') fail\n";
}
}
return 0;
} |
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