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Improved wording: Changed "safe" to "guaranteed"
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‎contributing/code/bc.rst‎

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@@ -32,17 +32,14 @@ Normal Interfaces
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All interfaces in the ``Symfony`` namespace are **safe for use**. That means
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that:
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* You can safely type hint against the interface.
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* You can type hint against the interface.
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* You can safely call any of the methods provided by the interface.
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* You can call any of the methods provided by the interface.
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However:
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* You cannot safely implement the interface. The interface may change, but all
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changes will be documented in the UPGRADE file.
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Methods tagged with ``@api`` are treated as if they belonged to an API
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interface.
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* You cannot implement the interface. The interface may change, but all changes
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will be documented in the UPGRADE file.
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API Interfaces
@@ -51,7 +48,7 @@ API Interfaces
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All interfaces tagged with ``@api`` are also **safe for implementation**. That
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means that:
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* You can safely implement the interface.
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* You can implement the interface.
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Internal Interfaces
@@ -68,24 +65,25 @@ Interfaces or interface methods tagged with ``@deprecated`` will be removed in
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a future Symfony version. You should never use nor implement them.
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Safe Operations
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...............
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Guarantee Details
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.................
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The following table summarizes the safe operations when using our interfaces:
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When using our interfaces, we guarantee full backwards compatibility for the
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following use cases:
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============================================== ============== ==============
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Operation Normal API
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Use Case Normal API
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============================================== ============== ==============
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Type hint against Safe Safe
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Call method Safe Safe
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Type hint against Yes Yes
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Call method Yes Yes
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**In Implementing Classes**
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Implement method Not Safe [1]_ Safe
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Add custom method Not Safe [1]_ Safe
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Add custom method parameter Not Safe [1]_ Safe
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Add parameter default value Safe Safe
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Implement method No [1]_ Yes
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Add custom method No [1]_ Yes
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Add custom method parameter No [1]_ Yes
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Add parameter default value Yes Yes
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============================================== ============== ==============
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If you need to do any of the things marked as "Not Safe" above, feel free to
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If you need to do any of the things marked with "No" above, feel free to
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ask us whether the ``@api`` tag can be added on the respective Symfony code.
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For that, simply open a `new ticket on GitHub`_.
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@@ -98,27 +96,24 @@ Normal Classes
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All classes in the ``Symfony`` namespace are **safe for use**. That means that:
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* You can safely type hint against the class' name.
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* You can type hint against the class' name.
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* You can safely create new instances.
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* You can create new instances.
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* You can safely extend the class.
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* You can extend the class.
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* You can safely access public properties.
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* You can access public properties.
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* You can safely call public methods.
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* You can call public methods.
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When extending the class:
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* You can safely override public properties.
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* You can override public properties.
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However:
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* You cannot safely override methods in extending classes. The class may change,
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but all changes will be documented in the UPGRADE file.
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Properties and methods tagged with ``@api`` are treated as if they belonged
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to an API class.
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* You cannot override methods in extending classes. The class may change, but
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all changes will be documented in the UPGRADE file.
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API Classes
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All classes tagged with ``@api`` are also **safe for extension**. That means
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that:
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* You can safely access protected properties and methods.
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* You can access protected properties and methods.
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* You can safely call protected methods.
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* You can call protected methods.
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* You can safely override protected properties.
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* You can override protected properties.
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* You can safely override public and protected methods.
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* You can override public and protected methods.
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Properties and methods tagged with ``@api`` are treated as if they belonged
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to an API class. That means that you can call or override them regardless of
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whether their class has the ``@api`` tag or not.
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Internal Classes
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................
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Classes, properties and class methods tagged with ``@internal`` are meant for
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internal use in Symfony only. You should never use nor extend them.
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Classes, properties and methods tagged with ``@internal`` are meant for internal
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use in Symfony only. You should never use nor extend them.
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Deprecated Classes
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..................
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Classes, properties and class methods tagged with ``@deprecated`` will be
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removed in a future Symfony version. You should never use nor extend them.
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Classes, properties and methods tagged with ``@deprecated`` will be removed in
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a future Symfony version. You should never use nor extend them.
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Test Classes
@@ -157,33 +156,34 @@ All classes located in the various ``*\\Tests\\`` namespaces are meant for
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internal use only. You should never create, extend or call them directly.
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Safe Operations
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...............
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Guarantee Details
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.................
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The following table summarizes the safe operations when using our classes:
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When using our classes, we guarantee full backwards compatibility for the
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following use cases:
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============================================== ============== ==============
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Operation Normal API
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Use Case Normal API
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============================================== ============== ==============
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Type hint against Safe Safe
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Create instance Safe Safe
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Extend Safe Safe
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Access public property Safe Safe
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Call public method Safe Safe
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Type hint against Yes Yes
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Create instance Yes Yes
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Extend Yes Yes
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Access public property Yes Yes
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Call public method Yes Yes
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**In Extending Classes**
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Access protected property Not Safe [1]_ Safe
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Call protected method Not Safe [1]_ Safe
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Override public property Safe Safe
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Override protected property Not Safe [1]_ Safe
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Override public method Not Safe [1]_ Safe
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Override protected method Not Safe [1]_ Safe
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Add custom property Not Safe Not Safe
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Add custom method Not Safe Not Safe
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Add custom method parameter Not Safe [1]_ Safe
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Add parameter default value Safe Safe
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Access protected property No [1]_ Yes
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Call protected method No [1]_ Yes
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Override public property Yes Yes
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Override protected property No [1]_ Yes
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Override public method No [1]_ Yes
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Override protected method No [1]_ Yes
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Add custom property No No
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Add custom method No No
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Add custom method parameter No [1]_ Yes
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Add parameter default value Yes Yes
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============================================== ============== ==============
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If you need to do any of the things marked as "Not Safe" above, feel free to
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If you need to do any of the things marked with "No" above, feel free to
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ask us whether the ``@api`` tag can be added on the respective Symfony code.
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For that, simply open a `new ticket on GitHub`_.
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