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minor #9718 Add traits to BC policy (nicolas-grekas)
This PR was submitted for the 2.7 branch but it was merged into the 2.8 branch instead (closes #9718). Discussion ---------- Add traits to BC policy Changing traits is more constrained that changing classes. Also embeds some things I found missing in other parts. Commits ------- 3c814db Add traits to BC policy
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‎contributing/code/bc.rst‎

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@@ -134,6 +134,41 @@ covered by our backward compatibility promise:
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| Access a private property (via Reflection) | No |
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+-----------------------------------------------+-----------------------------+
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Using our Traits
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~~~~~~~~~~~~~~~~
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All traits provided by Symfony may be used in your classes.
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.. caution::
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The exception to this rule are traits tagged with ``@internal``. Such
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traits should not be used.
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To be on the safe side, check the following table to know which use cases are
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covered by our backward compatibility promise:
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+-----------------------------------------------+-----------------------------+
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| Use Case | Backward Compatibility |
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+===============================================+=============================+
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| **If you...** | **Then we guarantee BC...** |
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+-----------------------------------------------+-----------------------------+
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| Use a trait | Yes |
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+-----------------------------------------------+-----------------------------+
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| **If you use the trait and...** | **Then we guarantee BC...** |
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+-----------------------------------------------+-----------------------------+
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| Use it to implement an interface | Yes |
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+-----------------------------------------------+-----------------------------+
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| Use it to implement an abstract method | Yes |
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+-----------------------------------------------+-----------------------------+
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| Use it to extend a parent class | Yes |
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+-----------------------------------------------+-----------------------------+
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| Use it to define an abstract class | Yes |
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+-----------------------------------------------+-----------------------------+
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| Use a public, protected or private property | Yes |
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+-----------------------------------------------+-----------------------------+
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| Use a public, protected or private method | Yes |
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+-----------------------------------------------+-----------------------------+
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Working on Symfony Code
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-----------------------
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@@ -169,6 +204,9 @@ Change argument type No
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Add return type No
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Remove return type No [9]_
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Change return type No
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**Static Methods**
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Turn non static into static No
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Turn static into non static No
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**Constants**
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Add constant Yes
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Remove constant No
@@ -200,21 +238,28 @@ Move to parent class Yes
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Add protected property Yes
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Remove protected property No [7]_
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Reduce visibility No [7]_
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Make public No [7]_
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Move to parent class Yes
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**Private Properties**
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Add private property Yes
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Make public or protected Yes
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Remove private property Yes
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**Constructors**
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Add constructor without mandatory arguments Yes [1]_
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Remove constructor No
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Reduce visibility of a public constructor No
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Reduce visibility of a protected constructor No [7]_
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Move to parent class Yes
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**Destructors**
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Add destructor Yes
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Remove destructor No
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Move to parent class Yes
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**Public Methods**
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Add public method Yes
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Remove public method No
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Change name No
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Reduce visibility No
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Make final No [6]_
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Move to parent class Yes
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Add argument without a default value No
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Add argument with a default value No [7]_ [8]_
@@ -232,6 +277,8 @@ Add protected method Yes
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Remove protected method No [7]_
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Change name No [7]_
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Reduce visibility No [7]_
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Make final No [6]_
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Make public No [7]_ [8]_
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Move to parent class Yes
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Add argument without a default value No [7]_
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Add argument with a default value No [7]_ [8]_
@@ -248,6 +295,7 @@ Change return type No [7]_ [8]_
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Add private method Yes
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Remove private method Yes
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Change name Yes
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Make public or protected Yes
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Add argument without a default value Yes
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Add argument with a default value Yes
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Remove argument Yes
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Add return type Yes
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Remove return type Yes
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Change return type Yes
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**Static Methods**
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**Static Methods and Properties**
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Turn non static into static No [7]_ [8]_
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Turn static into non static No
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**Constants**
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Change value of a constant Yes [1]_ [5]_
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================================================== ==============
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Changing Traits
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~~~~~~~~~~~~~~~
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This table tells you which changes you are allowed to do when working on
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Symfony's traits:
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================================================== ==============
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Type of Change Change Allowed
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================================================== ==============
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Remove entirely No
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Change name or namespace No
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Use another trait Yes
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**Public Properties**
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Add public property Yes
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Remove public property No
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Reduce visibility No
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Move to a used trait Yes
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**Protected Properties**
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Add protected property Yes
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Remove protected property No
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Reduce visibility No
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Make public No
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Move to a used trait Yes
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**Private Properties**
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Add private property Yes
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Remove private property No
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Make public or protected Yes
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Move to a used trait Yes
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**Constructors and destructors**
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Have constructor or destructor No
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**Public Methods**
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Add public method Yes
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Remove public method No
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Change name No
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Reduce visibility No
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Make final No [6]_
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Move to used trait Yes
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Add argument without a default value No
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Add argument with a default value No
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Remove argument No
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Add default value to an argument No
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Remove default value of an argument No
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Add type hint to an argument No
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Remove type hint of an argument No
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Change argument type No
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Change return type No
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**Protected Methods**
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Add protected method Yes
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Remove protected method No
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Change name No
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Reduce visibility No
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Make final No [6]_
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Make public No [8]_
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Move to used trait Yes
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Add argument without a default value No
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Add argument with a default value No
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Remove argument No
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Add default value to an argument No
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Remove default value of an argument No
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Add type hint to an argument No
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Remove type hint of an argument No
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Change argument type No
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Change return type No
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**Private Methods**
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Add private method Yes
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Remove private method No
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Change name No
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Make public or protected Yes
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Move to used trait Yes
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Add argument without a default value No
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Add argument with a default value No
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Remove argument No
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Add default value to an argument No
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Remove default value of an argument No
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Add type hint to an argument No
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Remove type hint of an argument No
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Change argument type No
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Add return type No
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Remove return type No
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Change return type No
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**Static Methods and Properties**
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Turn non static into static No
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Turn static into non static No
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================================================== ==============
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.. [1] Should be avoided. When done, this change must be documented in the
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UPGRADE file.
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