Defining Concepts
Learn how to define your own concept.
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When the concept you are looking for is not one of the predefined concepts in C++20, you must define your own concept. In this section, I will define a few concepts which will be distinguishable from the predefined concepts through the use of CamelCase syntax. Consequently, my concept for a signed integral is named SignedIntegral, whereas the C++ standard concept goes by the name signed_integral.
The syntax for defining a concept is straightforward:
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template <template-parameter-list>concept concept-name = constraint-expression;
A concept definition starts with the keyword ...