normalize.hpp

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#pragma once
 
#include <type_traits>
 
namespace core {
 
template < typename T >
struct normalize { };
 
template < class ReturnType >
using normalizationResult = typename std::decay_t < typename std::invoke_result_t < decltype ( core::normalize < ReturnType >::eval ), ReturnType && > >;
 
template < typename T >
struct has_eval {
private:
    template < class U >
    static std::true_type test ( U * )
    requires ( std::is_pointer_v < decltype ( & U::eval ) > );
    static std::false_type test ( ... );
public:
    static const bool value = decltype ( has_eval::test ( std::declval < std::decay_t < T > * > ( ) ) )::value;
};
 
} /* namespace core */