Access rights to a class property: special cases

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

This content has been translated automatically. Click here to view the French version.

Help / WLanguage / OOP (Object Oriented Programming)

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

Access rights to a class property

Access rights to a class property: special cases

The retrieval and assignment processes can be public, private or protected. The access rights of the property correspond to the less restrictive rights of the two processes.

Property access rights based on treatment access rights:


Assignment process / Retrieval process	Public	Protected	Private
Public	Public	Public	Public
Protected	Public	Protected	Protected
Private	Public	Protected	Private

The properties are accessible on the instances and by inheritance by respecting the standard restrictions of the public, protected and private inheritances.

If the access rights allow reading and not writing, the property is considered read-only.

If the access rights allow writing and not reading, the property is considered write-only.

These cases trigger an error during the compilation but no error is triggered at runtime.

The tables below present the possible cases:

Using the class:
Assignment process
/
Retrieval process Public Protected Private
Public Read/Write Write-only Write-only
Protected Read-only Protected Protected
Private Read-only Protected Private

Use of a derived class:
Assignment process
/
Retrieval process Public Protected Private
Public Read/Write Read/Write Write-only
Protected Read/Write Read/Write Write-only
Private Read-only Read-only Private

Using a class with inheritance public:
Assignment process
/
Retrieval process Public Protected Private
Public Read/Write Write-only Write-only
Protected Read-only Protected Protected
Private Read-only Protected Private

Use of a class derived from a class with inheritance public:
Assignment process
/
Retrieval process Public Protected Private
Public Read/Write Read/Write Write-only
Protected Read/Write Read/Write Write-only
Private Read-only Read-only Private

Using a class with protected inheritance:


Assignment process / Retrieval process	Public	Protected	Private
Public	Protected inheritance	Protected inheritance	Protected inheritance
Protected	Protected inheritance	Protected inheritance	Protected inheritance
Private	Protected inheritance	Protected inheritance	Protected inheritance

Use of a class derived from a class with protected inheritance:
Assignment process
/
Retrieval process Public Protected Private
Public Read/Write Read/Write Write-only
Protected Read/Write Read/Write Write-only
Private Read-only Read-only Private

Using a class with private inheritance:


Assignment process / Retrieval process	Public	Protected	Private
Public	Private inheritance	Private inheritance	Private inheritance
Protected	Private inheritance	Private inheritance	Private inheritance
Private	Private inheritance	Private inheritance	Private inheritance

Use of a derived class with private inheritance:


Assignment process / Retrieval process	Public	Protected	Private
Public	Private inheritance	Private inheritance	Private inheritance
Protected	Private inheritance	Private inheritance	Private inheritance
Private	Private inheritance	Private inheritance	Private inheritance