Here (see point 2 description) I read that a friend function in-class definition is only allowed in non-local class definition.
What does that mean?
Non-local class is a class that's not local.
A local class is a class defined in a function - see paragraph "Local classes" on this page
"Friend function in-class definition" refers to ability to declare and define a non-member function inside a class, which is a friend of the class it's enclosed in.
class a_class
{
friend std::ostream& operator<<(std::ostream& os, const a_class& x)
{
// ...
}
};
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