Nested Requirements
Explore how nested requirements allow you to specify more precise constraints within C++ Concepts without naming new concepts. This lesson helps you understand their syntax and usage through examples, enabling you to enforce detailed type safety and validate template parameters effectively in C++20.
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We can use nested requirements to specify additional constraints in a concept without introducing another named concept.
We can think of nested requirements as lambda functions for C++ standard library algorithms. We can use lambdas to alter the behavior of an algorithm without the need to name a function or a function object.
In this case, we can write a constraint more suited to our requirements without naming one more constraint that we would only use in one (nested) context.
Let’s check its syntax below:
requires constraint-expression;
Example 1
Let’s start with a simple example. Here, the ...