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);