What is scope chaining in C++?

What is scope chaining in C++?

Scope chaining in C++ refers to the way the compiler resolves variable names by looking up the scope hierarchy. When a variable is referenced, the compiler checks the current scope first, then moves up to the enclosing scopes until it finds the variable or reaches the global scope.

Can you give me an example of scope chaining?

Sure! Consider a function inside a class that has a member variable. If you have a local variable with the same name, the local variable will take precedence due to scope chaining.

What happens if a variable is not found in any scope?

If a variable is not found in any scope, the compiler will throw an error indicating that the variable is undeclared.

How does this relate to nested functions?

In nested functions, scope chaining allows the inner function to access variables from its own scope, the outer function's scope, and the global scope, following the same resolution process.