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Added M&M rule

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Use mutex and mutable for member variables together (C++11)
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rob100
2015-06-29 11:16:56 +02:00
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07-Considering_Threadability.md
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@@ -8,4 +8,11 @@ Global data leads to unintended side effects between functions and can make code
## Avoid Heap Operations
Much slower in threaded environments. In many or maybe even most cases, copying data is faster. Plus with move operations and such and things
Much slower in threaded environments. In many or maybe even most cases, copying data is faster. Plus with move operations and such and things.
## Mutex and mutable go together (M&M rule, C++11)
For member variables it is good practice to use mutex and mutable together. This applies in both ways:
1) A mutable member variable is presumed to be a shared variable so it should be synchronized with a mutex (or made atomic)
2) If a member variable is itself a mutex, it should be mutable. This is required to use it inside a const member function.