Alexander questions

• Why is it the case that the name of the function f4 has internal linkage, and not a C language linkage?
• What was the purpose of the emboldened text below in [class.copy]/12 in C++14?
• Why the template version is chosen below by the compiler?
• Definition of standard-layout class in C++14
• Why is int(a) an expression and int(unsigned(a)) a type-id in the example below?
• What exactly is the meaning of the footnote mentioned in [expr.ref]/1?
• How would you explain this difference in pointer to members of base and derived class using standard quotes?
• This code, why does it have to show undefined behavior?
• What does it mean by "indirectly declaring a namespace within another namespace"?
• In relation to the paragraph 12.7p3 in the C++ Standard, I have the following questions

Alexander answers