Make type of vector arbitrary - c++

Question

I'm currently implementing a simple stack in c++17, which has to have a toString-Method, that can deal among other types with std::vector as the template type.
My original problem was, that std::to_string can't accept vector's to I added a specialized implementation for vector's on top of my normal implementation:
template <class T> std::string SweCpp::Stack<T>::toString()
{
std::string result = "SweCpp::Stack[";
for (int a = 0; a < top + 1; a++)
{
T element = st[a];
result += std::to_string(element);
if (a != top) {
result += ", ";
}
}
result += "]";
return result;
}
template <> std::string SweCpp::Stack<std::vector<double>>::toString() {
std::string result = "SweCpp::Stack[";
for (int a = 0; a < top + 1; a++)
{
std::vector<double> element = st[a];
std::string vecAsString = "Vector{";
for (double value : element) {
vecAsString += std::to_string(value) + ",";
}
vecAsString += "}";
result += vecAsString;
if (a != top) {
result += ", ";
}
}
result += "]";
return result;
}
The idea is to call to_string for every element of the vectors, and build a string like that. The problem is, that I can't figure out, how to make the double arbitrary. How can I implement it, so that I can pass any type of vector, e.g. std::vector<int> and std::vector<std::string>?

Answer 1

Something along these lines, perhaps:
template <typename T>
std::string MyToString(const T& val) {
return std::to_string(val);
}
template <typename T>
std::string MyToString(const std::vector<T>& vec) {
std::string vecAsString = "Vector{";
for (const auto& value : vec) {
vecAsString += MyToString(value) + ",";
}
vecAsString += "}";
return vecAsString;
}
Now implement Stack<T>::toString() as in your first example, but call MyToString in place of std::to_string