代码描述：
写了一个类，命名为对象池（ObjectPool ），里面放个map容器。
3个功能：添加对象，删除对象，查找对象
该类只构建一次，故采用单例模式功能描述：对象池可以存储其他类的对象指针

单例模式的头文件

#ifndef jz_singleton_h__
#define jz_singleton_h__template<typename T>
class SINGLETON
{
public:static T* get_instance(){static T instance;return &instance;}virtual ~SINGLETON() noexcept {}SINGLETON(const SINGLETON&) = delete;SINGLETON& operator=(const SINGLETON&) = delete;protected:SINGLETON() {}
};#endif

对象池的头文件

#ifndef OBJECTPOOL_H
#define OBJECTPOOL_H#include <QObject>
#include <QMap>
#include "singleton.h"class ObjectPool : public QObject,public SINGLETON<ObjectPool>
{Q_OBJECT
public:explicit ObjectPool(QObject *parent = nullptr);bool addobject(QString object_name,QObject *object);bool removeobject(QString object_name);QObject* getobject(QString object_name);private:QMap<QString,QObject*>object_pool_;
};#endif // OBJECTPOOL_H

对象池的cpp文件

#include "objectpool.h"
#include <QDebug>
ObjectPool::ObjectPool(QObject *parent) : QObject(parent)
{}bool ObjectPool::addobject(QString object_name, QObject *object)
{if(object_name.isEmpty()){return false;}if(object==nullptr){return false;}if(object_pool_.contains(object_name)){return false;}object_pool_.insert(object_name,object);qDebug()<<"add object success";return true;}bool ObjectPool::removeobject(QString object_name)
{object_pool_.remove(object_name);qDebug()<<"remove object success";return true;
}QObject *ObjectPool::getobject(QString object_name)
{return object_pool_.value(object_name);}

用法：

//这里构造对象，先构造父类，生成单例指针。再构造子类对象池
ObjectPool *test_temp_pool= dynamic_cast<ObjectPool *>(ObjectPool::get_instance());//先添加一个对象QString first("first_object");QObject *first_object=new QObject();test_temp_pool->addobject(first,first_object);
//再删除这个对象test_temp_pool->removeobject(first);