boolean.hpp

 
#ifndef UFO_CONTAINER_TREE_PREDICATE_BOOLEAN_HPP
#define UFO_CONTAINER_TREE_PREDICATE_BOOLEAN_HPP
 
// UFO
#include <ufo/container/tree/predicate/filter.hpp>
 
namespace ufo::pred
{
template <bool Negated = false>
struct Boolean {
};
 
template <bool Negated>
[[nodiscard]] constexpr Boolean<!Negated> operator!(Boolean<Negated> const&) noexcept
{
    return Boolean<!Negated>{};
}
 
using True  = Boolean<true>;
using False = Boolean<false>;
 
template <bool Negated>
struct Filter<Boolean<Negated>> {
    using Pred = Boolean<Negated>;
 
    template <class Tree>
    static constexpr void init(Pred&, Tree const&) noexcept
    {
    }
 
    template <class Value>
    [[nodiscard]] static constexpr bool returnableValue(Pred const&, Value const&) noexcept
    {
        return Negated;
    }
 
    template <class Tree>
    [[nodiscard]] static constexpr bool returnable(Pred const&, Tree const&,
                                                   typename Tree::Node const&) noexcept
    {
        return Negated;
    }
 
    template <class Tree>
    [[nodiscard]] static constexpr bool traversable(Pred const&, Tree const&,
                                                    typename Tree::Node const&) noexcept
    {
        return Negated;
    }
 
    template <class Tree>
    [[nodiscard]] static constexpr bool returnableRay(Pred const&, Tree const&,
                                                      typename Tree::Node const&,
                                                      typename Tree::Ray const&) noexcept
    {
        return Negated;
    }
 
    template <class Tree>
    [[nodiscard]] static constexpr bool traversableRay(Pred const&, Tree const&,
                                                       typename Tree::Node const&,
                                                       typename Tree::Ray const&) noexcept
    {
        return Negated;
    }
};
}  // namespace ufo::pred
 
#endif  // UFO_CONTAINER_TREE_PREDICATE_BOOLEAN_HPP