Static member initialization in a class template

user_373025 0
Viewed 103740

I'd like to do this:

template <typename T>
struct S
{
    ...
    static double something_relevant = 1.5;
};

but I can't since something_relevant is not of integral type. It doesn't depend on T, but existing code depends on it being a static member of S.

Since S is template, I cannot put the definition inside a compiled file. How do I solve this problem ?

static templates c++
3 Answers

Since C++17, you can now declare the static member to be inline, which will define the variable in the class definition:

template <typename T>
struct S
{
    ...
    static inline double something_relevant = 1.5;
};

live: https://godbolt.org/g/bgSw1u

user_4931060
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