draconisplusplus/include/rfl/internal/Skip.hpp

#ifndef RFL_INTERNAL_SKIP_HPP_
#define RFL_INTERNAL_SKIP_HPP_

#include <optional>

namespace rfl::internal {

  template <class T, bool _skip_serialization, bool _skip_deserialization>
  class Skip {
   private:
    using SelfType = Skip<T, _skip_serialization, _skip_deserialization>;

   public:
    static constexpr bool skip_serialization_   = _skip_serialization;
    static constexpr bool skip_deserialization_ = _skip_deserialization;

    /// The underlying type.
    using Type           = T;
    using ReflectionType = std::optional<T>;

    Skip() : value_(Type()) {}

    Skip(const Type& _value) : value_(_value) {}

    Skip(ReflectionType&& _value) noexcept : value_(_value ? std::move(*_value) : Type()) {}

    Skip(const ReflectionType& _value) : value_(_value ? *_value : Type()) {}

    Skip(Type&& _value) noexcept : value_(std::move(_value)) {}

    Skip(SelfType&& _skip) noexcept = default;

    Skip(const SelfType& _skip) = default;

    template <class U, bool _skip_s, bool _skip_d>
    Skip(const Skip<U, _skip_s, _skip_d>& _other) : value_(_other.get()) {}

    template <class U, bool _skip_s, bool _skip_d>
    Skip(Skip<U, _skip_s, _skip_d>&& _other) : value_(_other.get()) {}

    template <class U, typename std::enable_if<std::is_convertible_v<U, Type>, bool>::type = true>
    Skip(const U& _value) : value_(_value) {}

    template <class U, typename std::enable_if<std::is_convertible_v<U, Type>, bool>::type = true>
    Skip(U&& _value) noexcept : value_(std::forward<U>(_value)) {}

    template <
      class U,
      bool _skip_s,
      bool _skip_d,
      typename std::enable_if<std::is_convertible_v<U, Type>, bool>::type = true>
    Skip(const Skip<U, _skip_s, _skip_d>& _skip) : value_(_skip.value()) {}

    /// Assigns the underlying object to its default value.
    template <
      class U                                                                 = Type,
      typename std::enable_if<std::is_default_constructible_v<U>, bool>::type = true>
    Skip(const Default& _default) : value_(Type()) {}

    ~Skip() = default;

    /// Returns the underlying object.
    Type& get() { return value_; }

    /// Returns the underlying object.
    const Type& get() const { return value_; }

    /// Returns the underlying object.
    Type& operator()() { return value_; }

    /// Returns the underlying object.
    const Type& operator()() const { return value_; }

    /// Assigns the underlying object.
    auto& operator=(const Type& _value) {
      value_ = _value;
      return *this;
    }

    /// Assigns the underlying object.
    auto& operator=(Type&& _value) noexcept {
      value_ = std::move(_value);
      return *this;
    }

    /// Assigns the underlying object.
    template <class U, typename std::enable_if<std::is_convertible_v<U, Type>, bool>::type = true>
    auto& operator=(const U& _value) {
      value_ = _value;
      return *this;
    }

    /// Assigns the underlying object to its default value.
    template <
      class U                                                                 = Type,
      typename std::enable_if<std::is_default_constructible_v<U>, bool>::type = true>
    auto& operator=(const Default& _default) {
      value_ = Type();
      return *this;
    }

    /// Assigns the underlying object.
    SelfType& operator=(const SelfType& _other) = default;

    /// Assigns the underlying object.
    SelfType& operator=(SelfType&& _other) = default;

    /// Assigns the underlying object.
    template <class U, bool _skip_s, bool _skip_d>
    auto& operator=(const Skip<U, _skip_s, _skip_d>& _skip) {
      value_ = _skip.get();
      return *this;
    }

    /// Assigns the underlying object.
    template <class U, bool _skip_s, bool _skip_d>
    auto& operator=(Skip<U, _skip_s, _skip_d>&& _skip) {
      value_ = std::forward<T>(_skip.value_);
      return *this;
    }

    /// Returns the ReflectionType - necessary for the serialization to work.
    ReflectionType reflection() const { return value_; }

    /// Assigns the underlying object.
    void set(const Type& _value) { value_ = _value; }

    /// Assigns the underlying object.
    void set(Type&& _value) { value_ = std::move(_value); }

    /// Returns the underlying object.
    Type& value() { return value_; }

    /// Returns the underlying object.
    const Type& value() const { return value_; }

   private:
    /// The underlying value
    T value_;
  };

} // namespace rfl::internal

#endif