What is the function of C++ template metaprogramming

This article mainly introduces "what is the role of C++ template metaprogramming". In daily operation, I believe many people have doubts about the role of C++ template metaprogramming. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "what is the role of C++ template metaprogramming?" Next, please follow the editor to study!

T.121: template metaprogramming is mainly used to imitate concepts

Reason (reason)

Until concepts become generally available, we need to emulate them using TMP. Use cases that require concepts (e.g. Overloading based on concepts) are among the most common (and simple) uses of TMP.

Before concepts are generally available, we need to use TMP to mimic them. Usage scenarios that require concepts (such as concept-based overloading) are in the more common (and simpler) use of TMP.

Example (sample)

Template

/ * requires*/ enable_if

Advance (Iter p, int n) {p + = n;}

Template

/ * requires*/ enable_if

Advance (Iter p, int n) {assert (n > = 0); while (n Mel -) + + p;} Note (note)

Such code is much simpler using concepts:

The above code would be much easier if you use the concept:

Void advance (RandomAccessIterator p, int n) {p + = n;}

Void advance (ForwardIterator p, int n) {assert (n > = 0); while (n Mel -) + + p;}

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