Need a vector whose type is determined by the runtime

I have a vector type of which will be determined at runtime. So how can I implement this?

I did some work on it. But it is not pretty and optimal.

Thank u in advance for any help.

#include <iostream>
#include <vector>
#include <typeinfo>
#include <variant>

template <typename T>
void fillVector(std::vector<T>& vector)
{
	// fill vector with values
}

struct A
{
	std::vector<std::variant<int, float, short>> values;
};

int main()
{
	A data;
	int type;
	std::cin >> type;

	if (type == 0) // int
	{
		std::vector<int> intValues;
		fillVector(intValues);
		for (const auto& value : intValues) 
		{
			data.values.push_back(value);
		}
	}
	else if (type == 1) // short
	{
		std::vector<short> shortValues;
		fillVector(shortValues);
		for (const auto& value : shortValues)
		{
			data.values.push_back(value);
		}
	}
	else // float
	{
		std::vector<float> floatValues;
		fillVector(floatValues);
		for (const auto& value : floatValues)
		{
			data.values.push_back(value);
		}
	}

	return 0;
}