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180 lines
6.8 KiB
C++
180 lines
6.8 KiB
C++
/*************************************************************************/
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/* callable.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef CALLABLE_H
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#define CALLABLE_H
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#include "core/object/object_id.h"
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#include "core/string/string_name.h"
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#include "core/templates/list.h"
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class Object;
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class Variant;
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class CallableCustom;
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// This is an abstraction of things that can be called.
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// It is used for signals and other cases where efficient calling of functions
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// is required. It is designed for the standard case (object and method)
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// but can be optimized or customized.
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// Enforce 16 bytes with `alignas` to avoid arch-specific alignment issues on x86 vs armv7.
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class Callable {
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alignas(8) StringName method;
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union {
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uint64_t object = 0;
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CallableCustom *custom;
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};
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public:
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struct CallError {
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enum Error {
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CALL_OK,
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CALL_ERROR_INVALID_METHOD,
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CALL_ERROR_INVALID_ARGUMENT, // expected is variant type
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CALL_ERROR_TOO_MANY_ARGUMENTS, // expected is number of arguments
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CALL_ERROR_TOO_FEW_ARGUMENTS, // expected is number of arguments
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CALL_ERROR_INSTANCE_IS_NULL,
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};
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Error error = Error::CALL_OK;
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int argument = 0;
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int expected = 0;
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};
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void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, CallError &r_call_error) const;
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void call_deferred(const Variant **p_arguments, int p_argcount) const;
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void rpc(int p_id, const Variant **p_arguments, int p_argcount, CallError &r_call_error) const;
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_FORCE_INLINE_ bool is_null() const {
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return method == StringName() && object == 0;
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}
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_FORCE_INLINE_ bool is_custom() const {
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return method == StringName() && custom != nullptr;
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}
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_FORCE_INLINE_ bool is_standard() const {
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return method != StringName();
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}
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bool is_valid() const;
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Callable bind(const Variant **p_arguments, int p_argcount) const;
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Callable unbind(int p_argcount) const;
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Object *get_object() const;
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ObjectID get_object_id() const;
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StringName get_method() const;
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CallableCustom *get_custom() const;
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uint32_t hash() const;
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const Callable *get_base_comparator() const; //used for bind/unbind to do less precise comparisons (ignoring binds) in signal connect/disconnect
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bool operator==(const Callable &p_callable) const;
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bool operator!=(const Callable &p_callable) const;
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bool operator<(const Callable &p_callable) const;
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void operator=(const Callable &p_callable);
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operator String() const;
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Callable(const Object *p_object, const StringName &p_method);
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Callable(ObjectID p_object, const StringName &p_method);
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Callable(CallableCustom *p_custom);
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Callable(const Callable &p_callable);
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Callable() {}
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~Callable();
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};
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class CallableCustom {
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friend class Callable;
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SafeRefCount ref_count;
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bool referenced = false;
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public:
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typedef bool (*CompareEqualFunc)(const CallableCustom *p_a, const CallableCustom *p_b);
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typedef bool (*CompareLessFunc)(const CallableCustom *p_a, const CallableCustom *p_b);
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//for every type that inherits, these must always be the same for this type
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virtual uint32_t hash() const = 0;
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virtual String get_as_text() const = 0;
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virtual CompareEqualFunc get_compare_equal_func() const = 0;
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virtual CompareLessFunc get_compare_less_func() const = 0;
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virtual StringName get_method() const;
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virtual ObjectID get_object() const = 0; //must always be able to provide an object
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virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, Callable::CallError &r_call_error) const = 0;
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virtual void rpc(int p_peer_id, const Variant **p_arguments, int p_argcount, Callable::CallError &r_call_error) const;
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virtual const Callable *get_base_comparator() const;
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CallableCustom();
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virtual ~CallableCustom() {}
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};
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// This is just a proxy object to object signals, its only
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// allocated on demand by/for scripting languages so it can
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// be put inside a Variant, but it is not
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// used by the engine itself.
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// Enforce 16 bytes with `alignas` to avoid arch-specific alignment issues on x86 vs armv7.
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class Signal {
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alignas(8) StringName name;
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ObjectID object;
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public:
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_FORCE_INLINE_ bool is_null() const {
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return object.is_null() && name == StringName();
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}
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Object *get_object() const;
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ObjectID get_object_id() const;
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StringName get_name() const;
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bool operator==(const Signal &p_signal) const;
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bool operator!=(const Signal &p_signal) const;
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bool operator<(const Signal &p_signal) const;
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operator String() const;
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Error emit(const Variant **p_arguments, int p_argcount) const;
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Error connect(const Callable &p_callable, uint32_t p_flags = 0);
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void disconnect(const Callable &p_callable);
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bool is_connected(const Callable &p_callable) const;
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Array get_connections() const;
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Signal(const Object *p_object, const StringName &p_name);
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Signal(ObjectID p_object, const StringName &p_name);
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Signal() {}
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};
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struct CallableComparator {
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const Callable &func;
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bool operator()(const Variant &p_l, const Variant &p_r) const;
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};
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#endif // CALLABLE_H
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