C++ where to initialize static const

Question

I have a class

class foo {
public:
   foo();
   foo( int );
private:
   static const string s;
};

Where is the best place to initialize the

Answer 1

Since C++17 the inline specifier also applies to variables. You can now define static member variables in the class definition:

#include 

class foo {
public:
   foo();
   foo( int );
private:
   inline static const std::string s { "foo" };
};