#include <evaluator.h>

Concept definition

template<class F, class I closure_arg_t<F>>
concept ultra::Evaluator = 
  Individual<I> && std::invocable<const F &, I>
  && Fitness<std::invoke_result_t<F, I>>

Detailed Description

Defines the requirements for a fitness evaluator.

An Evaluator is a callable object that:

operates on an Individual type;
can be invoked on a const instance of the evaluator;
returns a value satisfying the Fitness concept.

Requiring const-invocability ensures that evaluators can be safely used through read-only references, which is essential when they are wrapped by utility classes such as evaluator_proxy and invoked concurrently or through logically-const interfaces.