What is scope resolution in c plus plus?

Answer 1

Scope resolution allows the programmer to disambiguate between names that are common to two or more namespaces. For instance, if you imported two namespaces that both exposed different string classes, the compiler would not know which string class to use unless you use scope resolution to differentiate them. Scope resolution can also be used to differentiate between the different function overrides within a class hierarchy. By default, the most-derived function override is always executed implicitly, but that override may choose to invoke one or more of its base class overrides using scope resolution.

struct a { virtual void foo() {/*...*/} };

struct b : a { virtual void foo() override; };

void b::foo()

{

a::foo(); // explicitly invoke base class method using scope resolution.

// ...specialisation code goes here...

}