encapsulate C++ templates - c++

Question

I try to implement a template with an explicit template specification. The template and its implementation is shown bellow:
template <typename T>
class MyClass {
private:
T data;
size_t size;
public:
MyClass();
~MyClass();
uint32_t getSize();
T getData();
void setData(T value);
};
template <class T>
MyClass<T>::MyClass()
{
size = sizeof(T);
}
template <>
MyClass<std::string>::MyClass()
{
size = 0;
}
/* and so on */
Now I have an issue when my explicit declaration contains also a class template. Let say, i would create an explicit template specialization of a vector (containing any primitive type like int, char, float,...) and store the element site in the size variable.
template <??>
MyClass<std::vector<?>>::MyClass()
{
size = sizeof(?);
}
How could I do this?

Answer 1

You should specialize class, not methods:
#include <string>
#include <vector>
template <typename T>
class MyClass {
private:
T data;
size_t size;
public:
MyClass();
~MyClass();
uint32_t getSize();
T getData();
void setData(T value);
};
template <class T>
MyClass<T>::MyClass()
{
size = sizeof(T);
}
template <>
MyClass<std::string>::MyClass()
{
size = 0;
}
template<class T>
class MyClass<std::vector<T>>
{
MyClass();
T data;
size_t size;
};
template<class T>
MyClass<std::vector<T>>::MyClass()
{
size = sizeof(T);
}