possibly_const_container.h

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#pragma once
 
#include "di/container/concepts/constant_container.h"
#include "di/container/concepts/input_container.h"
#include "di/util/as_const.h"
 
namespace di::container::detail {
template<concepts::InputContainer Con>
constexpr auto possibly_const_container(Con& container) -> auto& {
    if constexpr (concepts::ConstantContainer<Con const> && !concepts::ConstantContainer<Con>) {
        return util::as_const(container);
    } else {
        return container;
    }
}
}