Chapter 4, Advanced Template Concepts

Question 1

When is name lookup performed?

Answer

Name lookup is performed at the point of template instantiation for dependent names (those that depend on the type or value of a template parameter) and at the point of template definition for non-dependent names (those that don’t depend on template parameters).

Question 2

What are deduction guides?

Answer

Deduction guides are a mechanism that tells the compiler how to perform class template argument deduction. Deduction guides are fictional function templates representing constructor signatures of a fictional class type. If overload resolution fails on the constructed set of fictional function templates, then the program is ill-formed and an error is generated. Otherwise, the return type of the selected function template specialization becomes the deduced class template specialization.

Question 3

What are forwarding references?

Answer

A forward reference...