Add whatever I was working on for the last month

1 files changed, 182 insertions, 0 deletions

diff --git a/deps/include/entt/signal/emitter.hpp b/deps/include/entt/signal/emitter.hpp
new file mode 100644
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+++ b/deps/include/entt/signal/emitter.hpp
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+#ifndef ENTT_SIGNAL_EMITTER_HPP

+#define ENTT_SIGNAL_EMITTER_HPP

+

+#include <functional>

+#include <type_traits>

+#include <utility>

+#include "../container/dense_map.hpp"

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

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

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

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

+#include "fwd.hpp"

+

+namespace entt {

+

+/**

+ * @brief General purpose event emitter.

+ *

+ * To create an emitter type, derived classes must inherit from the base as:

+ *

+ * @code{.cpp}

+ * struct my_emitter: emitter<my_emitter> {

+ *     // ...

+ * }

+ * @endcode

+ *

+ * Handlers for the different events are created internally on the fly. It's not

+ * required to specify in advance the full list of accepted events.<br/>

+ * Moreover, whenever an event is published, an emitter also passes a reference

+ * to itself to its listeners.

+ *

+ * @tparam Derived Emitter type.

+ * @tparam Allocator Type of allocator used to manage memory and elements.

+ */

+template<typename Derived, typename Allocator>

+class emitter {

+    using key_type = id_type;

+    using mapped_type = std::function<void(void *)>;

+

+    using alloc_traits = std::allocator_traits<Allocator>;

+    using container_allocator = typename alloc_traits::template rebind_alloc<std::pair<const key_type, mapped_type>>;

+    using container_type = dense_map<key_type, mapped_type, identity, std::equal_to<>, container_allocator>;

+

+public:

+    /*! @brief Allocator type. */

+    using allocator_type = Allocator;

+    /*! @brief Unsigned integer type. */

+    using size_type = std::size_t;

+

+    /*! @brief Default constructor. */

+    emitter()

+        : emitter{allocator_type{}} {}

+

+    /**

+     * @brief Constructs an emitter with a given allocator.

+     * @param allocator The allocator to use.

+     */

+    explicit emitter(const allocator_type &allocator)

+        : handlers{allocator, allocator} {}

+

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

+    emitter(const emitter &) = delete;

+

+    /**

+     * @brief Move constructor.

+     * @param other The instance to move from.

+     */

+    emitter(emitter &&other) noexcept

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

+

+    /**

+     * @brief Allocator-extended move constructor.

+     * @param other The instance to move from.

+     * @param allocator The allocator to use.

+     */

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

+        : handlers{container_type{std::move(other.handlers.first()), allocator}, allocator} {

+        ENTT_ASSERT(alloc_traits::is_always_equal::value || handlers.second() == other.handlers.second(), "Copying an emitter is not allowed");

+    }

+

+    /*! @brief Default destructor. */

+    virtual ~emitter() noexcept {

+        static_assert(std::is_base_of_v<emitter<Derived, Allocator>, Derived>, "Invalid emitter type");

+    }

+

+    /**

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

+     * @return This emitter.

+     */

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

+

+    /**

+     * @brief Move assignment operator.

+     * @param other The instance to move from.

+     * @return This emitter.

+     */

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

+        ENTT_ASSERT(alloc_traits::is_always_equal::value || handlers.second() == other.handlers.second(), "Copying an emitter is not allowed");

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

+        return *this;

+    }

+

+    /**

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

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

+     */

+    void swap(emitter &other) {

+        using std::swap;

+        swap(handlers, other.handlers);

+    }

+

+    /**

+     * @brief Returns the associated allocator.

+     * @return The associated allocator.

+     */

+    [[nodiscard]] constexpr allocator_type get_allocator() const noexcept {

+        return handlers.second();

+    }

+

+    /**

+     * @brief Publishes a given event.

+     * @tparam Type Type of event to trigger.

+     * @param value An instance of the given type of event.

+     */

+    template<typename Type>

+    void publish(Type &&value) {

+        if(const auto id = type_id<Type>().hash(); handlers.first().contains(id)) {

+            handlers.first()[id](&value);

+        }

+    }

+

+    /**

+     * @brief Registers a listener with the event emitter.

+     * @tparam Type Type of event to which to connect the listener.

+     * @param func The listener to register.

+     */

+    template<typename Type>

+    void on(std::function<void(Type &, Derived &)> func) {

+        handlers.first().insert_or_assign(type_id<Type>().hash(), [func = std::move(func), this](void *value) {

+            func(*static_cast<Type *>(value), static_cast<Derived &>(*this));

+        });

+    }

+

+    /**

+     * @brief Disconnects a listener from the event emitter.

+     * @tparam Type Type of event of the listener.

+     */

+    template<typename Type>

+    void erase() {

+        handlers.first().erase(type_hash<std::remove_cv_t<std::remove_reference_t<Type>>>::value());

+    }

+

+    /*! @brief Disconnects all the listeners. */

+    void clear() noexcept {

+        handlers.first().clear();

+    }

+

+    /**

+     * @brief Checks if there are listeners registered for the specific event.

+     * @tparam Type Type of event to test.

+     * @return True if there are no listeners registered, false otherwise.

+     */

+    template<typename Type>

+    [[nodiscard]] bool contains() const {

+        return handlers.first().contains(type_hash<std::remove_cv_t<std::remove_reference_t<Type>>>::value());

+    }

+

+    /**

+     * @brief Checks if there are listeners registered with the event emitter.

+     * @return True if there are no listeners registered, false otherwise.

+     */

+    [[nodiscard]] bool empty() const noexcept {

+        return handlers.first().empty();

+    }

+

+private:

+    compressed_pair<container_type, allocator_type> handlers;

+};

+

+} // namespace entt

+

+#endif