maybe_reduced.hpp

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//
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#pragma once

#include <atria/xform/state_wrapper.hpp>

namespace atria {
namespace xform {

struct maybe_reduced_tag {};

template <typename T>
using maybe_reduced = state_wrapper<maybe_reduced_tag, T, bool>;

inline bool state_wrapper_data_is_reduced(maybe_reduced_tag, bool is_reduced)
{
  return is_reduced;
}

template <typename T>
auto reduced_if(T&& x, bool is_reduced)
  -> maybe_reduced<estd::decay_t<T> >
{
  return maybe_reduced<estd::decay_t<T> > {
    std::forward<T>(x),
    is_reduced
  };
}

template <typename T>
auto reduced(T&& x)
  -> ABL_DECLTYPE_RETURN(
    reduced_if(std::forward<T>(x), true))


template <typename T>
auto not_reduced(T&& x)
  -> ABL_DECLTYPE_RETURN(
    reduced_if(std::forward<T>(x), false))

} // namespace xform
} // namespace atria