Crunch::messages::IsPresenceValidator Concept Reference

Concept for a Presence Validator. More...

#include <crunch_field.hpp>

Concept definition

template<typename T>
concept Crunch::messages::IsPresenceValidator =  requires(bool set, FieldId id) {
    { T::check_presence(set, id) } -> std::same_as<std::optional<Error>>;
}

Detailed Description

Concept for a Presence Validator.