75 lines
2.5 KiB
C++
Executable File
75 lines
2.5 KiB
C++
Executable File
/**
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* brief 工具类——反射，主要用作根据类名动态创建类
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* author 赵民勇
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* note :
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* 1、类需要继承自QObject或其派生数的上层节点包含QObject
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* 2、暂时只提供无参构造函数注册
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* 3、需要动态创建的类头文件中引入本头文件，并且在类定义中使用宏DECLARE_DYNAMIC_CLASS(yourClassName); 在类定义文件（.cpp）中使用IMPL_DYNAMIC_CLASS(yourClassName)
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* 注意：这些宏如果不合适，请自行在自己的工厂类中自行定制宏
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* 4、例：
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* 类定义的头文件.h中：
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* #include <QObject>
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* #include "../common/dynamiccreator.h"
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* class MyClass : public QObject
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* {
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* Q_OBJECT
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* DECLARE_DYNCREATE_WITH_ONE_PARAM(MyClass, QObject*, QObject*)
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* }
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*
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* .cpp文件中，代码开始前写上：
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* IMPLEMENT_DYNCREATE_WITH_ONE_PARAM(MyClass, QObject*, QObject*)
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*/
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#ifndef DYNAMIC_CREATOR_H
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#define DYNAMIC_CREATOR_H
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#include <QObject>
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#include <QHash>
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#include <QString>
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#include <functional>
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template<typename ReturnType, typename... Args>
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class DynamicCreator
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{
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public:
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typedef ReturnType (*Constructor)(Args...);
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static int registerClass(const QString& className, Constructor constructor) {
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QHash<QString, Constructor>& instances = constructors();
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instances.insert(className, constructor);
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return instances.size();
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}
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static ReturnType createInstance(const QString& className, Args... args) {
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QHash<QString, Constructor>& instances = constructors();
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if (instances.contains(className)) {
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Constructor constructor = instances[className];
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if (constructor != nullptr) {
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return (*constructor)(args...);
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}
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}
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return nullptr;
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}
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private:
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static QHash<QString, Constructor>& constructors() {
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static QHash<QString, Constructor> _instances;
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return _instances;
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}
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};
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#define DECLARE_DYNCREATE_WITH_ONE_PARAM(class_name, return_type, param_type) \
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public: \
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static return_type create##class_name##Object(param_type arg1);
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#define IMPLEMENT_DYNCREATE_WITH_ONE_PARAM(class_name, return_type, param_type) \
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return_type class_name::create##class_name##Object(param_type arg1) \
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{ \
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return static_cast<return_type>(new class_name(arg1)); \
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} \
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static int g_icreate##class_name##Object = DynamicCreator<return_type, param_type>::registerClass(#class_name, class_name::create##class_name##Object);
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#endif //!DYNAMIC_CREATOR_H
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