CODEWITHSUNDEEP
c++templatesc++14
moudi
moudi

Reputation: 518

encapsulate C++ templates

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?

Upvotes: 0

Views: 196

Answers (1)

3CxEZiVlQ
3CxEZiVlQ

Reputation: 38499

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);
}

Upvotes: 2

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