Qt本身就提供了专门的宏 Q_GLOBAL_STATIC。通过这个宏不但定义简单,还可以获得线程安全性。
1、先看官方文档
https://doc.qt.io/qt-5/qglobalstatic.html
https://doc.qt.io/qt-5/threads-reentrancy.html
2、再看使用方法
Q_GLOBAL_STATIC(Type, VariableName)
Q_GLOBAL_STATIC_WITH_ARGS(Type, VariableName, Arguments)
rule.h
#ifndef RULE_H
#define RULE_H
class Rule
{
public:
static Rule* instance();
};
#endif // RULE_H
rule.cpp
#include "rule.h"
Q_GLOBAL_STATIC(Rule, rule)
Rule* Rule::instance()
{
return rule();
}
在任何地方,引用头文件 include "rule.h"
就可以 Rule::instance()->xxxxxx()
---
参考文献
https://www.cnblogs.com/findumars/p/10392770.html
http://qtdebug.com/qtbook-singleton/
引申阅读
https://doc.qt.io/qt-5/qthreadpool.html Qt线程池
https://doc.qt.io/qt-5/qsharedpointer.html Qt 智能指针
https://doc.qt.io/QtMQTT/index.html Qt Mqtt
来源:oschina
链接:https://my.oschina.net/u/4345075/blog/3274240