overload.h

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#pragma once
 
#include "di/function/piped.h"
#include "di/function/pipeline.h"
#include "di/meta/operations.h"
#include "di/meta/util.h"
#include "di/util/forward.h"
 
namespace di::function {
namespace detail {
    template<typename... Funs>
    struct OverloadImpl : Funs... {
        using Funs::operator()...;
    };
 
    template<typename... Funs>
    OverloadImpl(Funs&&...) -> OverloadImpl<Funs...>;
 
    struct OverloadFunction {
        template<typename... Funs>
        requires(concepts::ConstructibleFrom<meta::Decay<Funs>, Funs> && ...)
        constexpr auto operator()(Funs&&... functions) const {
            return function::piped(OverloadImpl(util::forward<Funs>(functions)...));
        }
    };
}
 
constexpr inline auto overload = detail::OverloadFunction {};
}
 
namespace di {
using function::overload;
}