How Do I Define Non-Integral Static Data Members in C Class Templates?

Defining Static Data Members in Class Templates

When working with class templates, you may encounter the challenge of declaring static data members that are not of integral type. This arises when you have code that depends on a static data member being present within the class template but is not determined by its template parameter.

One solution to this problem is to define the static data member in the header file where the class template is declared. This ensures that the member is declared outside of the template class definition, allowing it to be initialized separately.

For instance, considering the following class template:

template <typename T>
struct S
{
    ...
    static double something_relevant;
};

We can define the static data member something_relevant in the same header file as follows:

template <typename T>
double S<T>::something_relevant = 1.5;

This approach isolates the definition of the static data member from the class template, enabling you to initialize it independently. Moreover, since it's part of a template, the compiler ensures that it is defined only once, preventing multiple definitions.

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