with_await_transform.h

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#pragma once
 
#include "di/function/tag_invoke.h"
#include "di/util/forward.h"
 
namespace di::execution {
namespace as_awaitable_ns {
    struct Function;
}
 
extern as_awaitable_ns::Function const as_awaitable;
 
template<typename Derived>
struct WithAwaitTransform {
    template<typename T>
    auto await_transform(T&& value) noexcept -> T&& {
        return util::forward<T>(value);
    }
 
    template<typename T>
    requires(concepts::TagInvocable<as_awaitable_ns::Function, T, Derived&>)
    auto await_transform(T&& value) noexcept -> meta::TagInvokeResult<as_awaitable_ns::Function, T, Derived&> {
        return function::tag_invoke(as_awaitable, util::forward<T>(value), static_cast<Derived&>(*this));
    }
};
}