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#include <functional>
#include <string>
#include <iostream>
template<typename T>
struct lambda_trait_helper;
template<typename T, typename Result, typename... Args>
struct lambda_trait_helper<Result(T::*)(Args...) const> {
using result_type = Result;
};
template<typename Func>
struct lambda_traits: lambda_trait_helper<decltype(&Func::operator())> {};
template<typename... ArgTypes>
class MyClass {
public:
//boolean function of some argument
template<typename Type> using Func = bool(Type const &);
//type for a tuple of pointers to templated boolean functions
template<typename... Types> using TupleOfFunctions = typename std::tuple<Func<Types>*...>;
//the tuple
TupleOfFunctions<ArgTypes...> _tuple;
//constructor
MyClass(TupleOfFunctions<ArgTypes...> t) : _tuple(t) {
}
};
int main(int argc, char** argv) {
bool (*i)(int&) = +[](int &arg){return arg > 0;};
MyClass<int, std::string> M(std::make_tuple(+[](const int &arg) { return arg > 0; },+[](const std::string &arg) { return arg == "abc"; }));
std::cout << (*std::get<0>(M._tuple))(1) << std::endl;
std::cout << (*std::get<1>(M._tuple))("xyz") << std::endl;
return 0;
}
