pipe_utility.hpp

#ifndef TERMOX_WIDGET_DETAIL_PIPE_UTILITY_HPP
#define TERMOX_WIDGET_DETAIL_PIPE_UTILITY_HPP
#include <memory>
#include <type_traits>
 
#include <termox/widget/widget.hpp>
 
namespace ox::pipe::detail {
 
template <typename Predicate>
class Filter_predicate {
   public:
    explicit Filter_predicate(Predicate p) : predicate{p} {}
 
   public:
    Predicate predicate;
};
 
template <typename W>
class Dynamic_filter_predicate {
   public:
    using Widget_t = W;
};
 
template <typename T>
struct is_widget_ptr : std::false_type {};
 
template <typename X>
struct is_widget_ptr<std::unique_ptr<X>> : std::is_base_of<ox::Widget, X> {};
 
template <typename T>
constexpr bool is_widget_ptr_v = is_widget_ptr<T>::value;
 
template <typename T>
constexpr bool is_widget_v = std::is_base_of_v<Widget, std::decay_t<T>>;
 
template <typename T>
constexpr bool is_widget_or_wptr =
    is_widget_v<T> || is_widget_ptr_v<std::decay_t<T>>;
 
}  // namespace ox::pipe::detail
 
namespace ox {
 
template <typename T>
[[nodiscard]] constexpr auto get(T& x) -> auto&
{
    if constexpr (::ox::pipe::detail::is_widget_ptr_v<T>)
        return *x;
    else
        return x;
}
 
}  // namespace ox
#endif  // TERMOX_WIDGET_DETAIL_PIPE_UTILITY_HPP