monad_fail.h

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#pragma once
 
#include "di/function/tag_invoke.h"
#include "di/util/forward.h"
 
namespace di::function::monad {
struct FailFunction {
    template<typename T, typename F>
    constexpr auto operator()(T&& value, F&& function) const -> meta::TagInvokeResult<FailFunction, T, F> {
        return tag_invoke(*this, util::forward<T>(value), util::forward<F>(function));
    }
};
 
constexpr inline auto fail = FailFunction {};
}