I am trying to create a template code which gives the functionality to create vector of n different types and then insert data in the vector of the particular type associated with it.
#include <iostream>
#include <tuple>
#include <vector>
template <typename T>
struct is_same {
using type = T;
};
template <typename T>
struct UnderlyingTypeInSymlist {
using type = std::vector<T>;
};
template <template <typename> class ToActual_ = is_same, typename... Types>
class TupleOfTypes {
private:
struct dummy_type {};
public:
template <typename T>
using ToActual = typename ToActual_<T>::type;
protected:
static std::tuple<ToActual<Types>...> tuple_;
public:
using UnderlyingType = decltype(tuple_);
static constexpr std::size_t TypeCount = std::tuple_size<UnderlyingType>::value;
template <typename T, std::size_t I>
ToActual<T> Get() {
return std::get<I> (tuple_);
}
};
int main () {
using Parent = TupleOfTypes<UnderlyingTypeInSymlist, int, char, float, double, short, long>;
Parent vect_;
// auto& list = Parent::template Get<int, (std::size_t)0>();
auto& list = vect_.template Get<int, (std::size_t)0>();
for (int i=0; i<50; i++) {
list.emplace_back(i);
}
for (auto a : list) {
std::cout<<a<<std::endl;
}
return 0;
}
It should print the numbers starting form 0 to 49 b ut it is giving some compilation error.
prog.cpp: In function 'int main()':
prog.cpp:36:57: error: invalid initialization of non-const reference of type 'std::vector<int>&' from an rvalue of type 'TupleOfTypes<UnderlyingTypeInSymlist, int, char, float, double, short int, long int>::ToActual<int> {aka std::vector<int>}'
auto& list = vect_.template Get<int, (std::size_t)0>();
^
What is the error with the above code. Also some clarification about any wrong section of the code would be helpful.
