is_nullopt.h

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#pragma once
 
#include "di/function/tag_invoke.h"
 
namespace di::vocab {
constexpr inline struct IsNulloptFunction {
    template<typename T>
    requires(concepts::TagInvocableTo<IsNulloptFunction, bool, T const&>)
    constexpr auto operator()(T const& value) const -> bool {
        return di::function::tag_invoke(*this, value);
    }
} is_nullopt {};
}