Add whatever I was working on for the last month

1 files changed, 318 insertions, 0 deletions

diff --git a/deps/include/entt/entity/mixin.hpp b/deps/include/entt/entity/mixin.hpp
new file mode 100644
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+++ b/deps/include/entt/entity/mixin.hpp
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+#ifndef ENTT_ENTITY_MIXIN_HPP

+#define ENTT_ENTITY_MIXIN_HPP

+

+#include <type_traits>

+#include <utility>

+#include "../config/config.h"

+#include "../core/any.hpp"

+#include "../signal/sigh.hpp"

+#include "entity.hpp"

+#include "fwd.hpp"

+

+namespace entt {

+

+/**

+ * @brief Mixin type used to add signal support to storage types.

+ *

+ * The function type of a listener is equivalent to:

+ *

+ * @code{.cpp}

+ * void(basic_registry<entity_type> &, entity_type);

+ * @endcode

+ *

+ * This applies to all signals made available.

+ *

+ * @tparam Type Underlying storage type.

+ * @tparam Registry Basic registry type.

+ */

+template<typename Type, typename Registry>

+class basic_sigh_mixin final: public Type {

+    using underlying_type = Type;

+    using owner_type = Registry;

+

+    using basic_registry_type = basic_registry<typename underlying_type::entity_type, typename underlying_type::base_type::allocator_type>;

+    using sigh_type = sigh<void(owner_type &, const typename underlying_type::entity_type), typename underlying_type::allocator_type>;

+    using underlying_iterator = typename underlying_type::base_type::basic_iterator;

+

+    static_assert(std::is_base_of_v<basic_registry_type, owner_type>, "Invalid registry type");

+

+    [[nodiscard]] auto &owner_or_assert() const noexcept {

+        ENTT_ASSERT(owner != nullptr, "Invalid pointer to registry");

+        return static_cast<owner_type &>(*owner);

+    }

+

+private:

+    void pop(underlying_iterator first, underlying_iterator last) final {

+        if(auto &reg = owner_or_assert(); destruction.empty()) {

+            underlying_type::pop(first, last);

+        } else {

+            for(; first != last; ++first) {

+                const auto entt = *first;

+                destruction.publish(reg, entt);

+                const auto it = underlying_type::find(entt);

+                underlying_type::pop(it, it + 1u);

+            }

+        }

+    }

+

+    void pop_all() final {

+        if(auto &reg = owner_or_assert(); !destruction.empty()) {

+            if constexpr(std::is_same_v<typename underlying_type::element_type, typename underlying_type::entity_type>) {

+                for(typename underlying_type::size_type pos{}, last = underlying_type::free_list(); pos < last; ++pos) {

+                    destruction.publish(reg, underlying_type::base_type::operator[](pos));

+                }

+            } else {

+                for(auto entt: static_cast<typename underlying_type::base_type &>(*this)) {

+                    if constexpr(underlying_type::storage_policy == deletion_policy::in_place) {

+                        if(entt != tombstone) {

+                            destruction.publish(reg, entt);

+                        }

+                    } else {

+                        destruction.publish(reg, entt);

+                    }

+                }

+            }

+        }

+

+        underlying_type::pop_all();

+    }

+

+    underlying_iterator try_emplace(const typename underlying_type::entity_type entt, const bool force_back, const void *value) final {

+        const auto it = underlying_type::try_emplace(entt, force_back, value);

+

+        if(auto &reg = owner_or_assert(); it != underlying_type::base_type::end()) {

+            construction.publish(reg, *it);

+        }

+

+        return it;

+    }

+

+public:

+    /*! @brief Allocator type. */

+    using allocator_type = typename underlying_type::allocator_type;

+    /*! @brief Underlying entity identifier. */

+    using entity_type = typename underlying_type::entity_type;

+    /*! @brief Expected registry type. */

+    using registry_type = owner_type;

+

+    /*! @brief Default constructor. */

+    basic_sigh_mixin()

+        : basic_sigh_mixin{allocator_type{}} {}

+

+    /**

+     * @brief Constructs an empty storage with a given allocator.

+     * @param allocator The allocator to use.

+     */

+    explicit basic_sigh_mixin(const allocator_type &allocator)

+        : underlying_type{allocator},

+          owner{},

+          construction{allocator},

+          destruction{allocator},

+          update{allocator} {}

+

+    /*! @brief Default copy constructor, deleted on purpose. */

+    basic_sigh_mixin(const basic_sigh_mixin &) = delete;

+

+    /**

+     * @brief Move constructor.

+     * @param other The instance to move from.

+     */

+    basic_sigh_mixin(basic_sigh_mixin &&other) noexcept

+        : underlying_type{std::move(other)},

+          owner{other.owner},

+          construction{std::move(other.construction)},

+          destruction{std::move(other.destruction)},

+          update{std::move(other.update)} {}

+

+    /**

+     * @brief Allocator-extended move constructor.

+     * @param other The instance to move from.

+     * @param allocator The allocator to use.

+     */

+    basic_sigh_mixin(basic_sigh_mixin &&other, const allocator_type &allocator)

+        : underlying_type{std::move(other), allocator},

+          owner{other.owner},

+          construction{std::move(other.construction), allocator},

+          destruction{std::move(other.destruction), allocator},

+          update{std::move(other.update), allocator} {}

+

+    /*! @brief Default destructor. */

+    ~basic_sigh_mixin() noexcept override = default;

+

+    /**

+     * @brief Default copy assignment operator, deleted on purpose.

+     * @return This mixin.

+     */

+    basic_sigh_mixin &operator=(const basic_sigh_mixin &) = delete;

+

+    /**

+     * @brief Move assignment operator.

+     * @param other The instance to move from.

+     * @return This mixin.

+     */

+    basic_sigh_mixin &operator=(basic_sigh_mixin &&other) noexcept {

+        owner = other.owner;

+        construction = std::move(other.construction);

+        destruction = std::move(other.destruction);

+        update = std::move(other.update);

+        underlying_type::operator=(std::move(other));

+        return *this;

+    }

+

+    /**

+     * @brief Exchanges the contents with those of a given storage.

+     * @param other Storage to exchange the content with.

+     */

+    void swap(basic_sigh_mixin &other) {

+        using std::swap;

+        swap(owner, other.owner);

+        swap(construction, other.construction);

+        swap(destruction, other.destruction);

+        swap(update, other.update);

+        underlying_type::swap(other);

+    }

+

+    /**

+     * @brief Returns a sink object.

+     *

+     * The sink returned by this function can be used to receive notifications

+     * whenever a new instance is created and assigned to an entity.<br/>

+     * Listeners are invoked after the object has been assigned to the entity.

+     *

+     * @sa sink

+     *

+     * @return A temporary sink object.

+     */

+    [[nodiscard]] auto on_construct() noexcept {

+        return sink{construction};

+    }

+

+    /**

+     * @brief Returns a sink object.

+     *

+     * The sink returned by this function can be used to receive notifications

+     * whenever an instance is explicitly updated.<br/>

+     * Listeners are invoked after the object has been updated.

+     *

+     * @sa sink

+     *

+     * @return A temporary sink object.

+     */

+    [[nodiscard]] auto on_update() noexcept {

+        return sink{update};

+    }

+

+    /**

+     * @brief Returns a sink object.

+     *

+     * The sink returned by this function can be used to receive notifications

+     * whenever an instance is removed from an entity and thus destroyed.<br/>

+     * Listeners are invoked before the object has been removed from the entity.

+     *

+     * @sa sink

+     *

+     * @return A temporary sink object.

+     */

+    [[nodiscard]] auto on_destroy() noexcept {

+        return sink{destruction};

+    }

+

+    /**

+     * @brief Emplace elements into a storage.

+     *

+     * The behavior of this operation depends on the underlying storage type

+     * (for example, components vs entities).<br/>

+     * Refer to the specific documentation for more details.

+     *

+     * @return A return value as returned by the underlying storage.

+     */

+    auto emplace() {

+        const auto entt = underlying_type::emplace();

+        construction.publish(owner_or_assert(), entt);

+        return entt;

+    }

+

+    /**

+     * @brief Emplace elements into a storage.

+     *

+     * The behavior of this operation depends on the underlying storage type

+     * (for example, components vs entities).<br/>

+     * Refer to the specific documentation for more details.

+     *

+     * @tparam Args Types of arguments to forward to the underlying storage.

+     * @param hint A valid identifier.

+     * @param args Parameters to forward to the underlying storage.

+     * @return A return value as returned by the underlying storage.

+     */

+    template<typename... Args>

+    decltype(auto) emplace(const entity_type hint, Args &&...args) {

+        if constexpr(std::is_same_v<typename underlying_type::element_type, typename underlying_type::entity_type>) {

+            const auto entt = underlying_type::emplace(hint, std::forward<Args>(args)...);

+            construction.publish(owner_or_assert(), entt);

+            return entt;

+        } else {

+            underlying_type::emplace(hint, std::forward<Args>(args)...);

+            construction.publish(owner_or_assert(), hint);

+            return this->get(hint);

+        }

+    }

+

+    /**

+     * @brief Patches the given instance for an entity.

+     * @tparam Func Types of the function objects to invoke.

+     * @param entt A valid identifier.

+     * @param func Valid function objects.

+     * @return A reference to the patched instance.

+     */

+    template<typename... Func>

+    decltype(auto) patch(const entity_type entt, Func &&...func) {

+        underlying_type::patch(entt, std::forward<Func>(func)...);

+        update.publish(owner_or_assert(), entt);

+        return this->get(entt);

+    }

+

+    /**

+     * @brief Emplace elements into a storage.

+     *

+     * The behavior of this operation depends on the underlying storage type

+     * (for example, components vs entities).<br/>

+     * Refer to the specific documentation for more details.

+     *

+     * @tparam It Iterator type (as required by the underlying storage type).

+     * @tparam Args Types of arguments to forward to the underlying storage.

+     * @param first An iterator to the first element of the range.

+     * @param last An iterator past the last element of the range.

+     * @param args Parameters to use to forward to the underlying storage.

+     */

+    template<typename It, typename... Args>

+    void insert(It first, It last, Args &&...args) {

+        auto from = underlying_type::size();

+        underlying_type::insert(first, last, std::forward<Args>(args)...);

+

+        if(auto &reg = owner_or_assert(); !construction.empty()) {

+            for(const auto to = underlying_type::size(); from != to; ++from) {

+                construction.publish(reg, underlying_type::operator[](from));

+            }

+        }

+    }

+

+    /**

+     * @brief Forwards variables to derived classes, if any.

+     * @param value A variable wrapped in an opaque container.

+     */

+    void bind(any value) noexcept final {

+        auto *reg = any_cast<basic_registry_type>(&value);

+        owner = reg ? reg : owner;

+        underlying_type::bind(std::move(value));

+    }

+

+private:

+    basic_registry_type *owner;

+    sigh_type construction;

+    sigh_type destruction;

+    sigh_type update;

+};

+

+} // namespace entt

+

+#endif