What are the characteristics of protecting members? c What are the characteristics of the protection

A guard member is a special kind of member variable in C++ whose characteristics include the following:

1.Protection members have private access to the class, i.e., they can only be accessed inside the class, not directly by outside the class.

2.In a derived class, protection members can continue to be accessed, but cannot be inherited by subclasses.

3.Protection members can participate in the memory allocation of class objects, so they can be initialized in class constructors and destructors.

4.Protection members can be accessed inside the member functions of the class to achieve data hiding, reuse, and other features.

Therefore, the use of protection members allows us to limit access to data inside the class to a certain extent, and to guarantee the security and integrity of the data.

private permissions: There are two types of permissions: 1own class itself, 2The friend function declared in the class, the friend class.

protected permissions: On top of the private permissions, plus can be accessed by subclasses.

public permissions: Exposed interfaces, any function can be used.

I'll give a list of the derivation methods: private protected public base class member permissions: protected protected protected permissions in the derived class:

private private protectedExternal: Invisible Invisible Invisible.

It cannot be directly accessed externally, but it can be accessed by a derived class of the class.

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Don't install too many apps so that your system doesn't get overwhelmed. Finally, unlike computers, mobile phones are actually easy to maintain, usually pay more attention to yourself, and the performance will not weaken with the growth of time.

Don't let him eat anything too greasy...

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The public and protected members of the base class all appear in the derived class with protected access.

The flexible protection and interception strength of the system is sufficient to absorb and disperse the impact kinetic energy of the transfer stone, and the design and adoption of the pressure reducing ring further improve the impulse of the system.

All components of the system are produced in a standardized factory and constructed on site. In addition to a small amount of foundation construction with bolt installation as the main body, it is mainly for building block installation.

The construction personnel and machinery and equipment are reduced, and the installation is simple and easy, thereby shortening the construction period.

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The volt-second characteristics of the protected device should always be lower than the volt-second characteristics of the protected device. In this way, when there is an overvoltage acting on two devices, the protective equipment always breaks down first, and then limits the amplitude of the overvoltage and protects the protected equipment.