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Include details about reading extern static mut in the FFI tutorial. #9980

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nejucomo opened this issue Oct 20, 2013 · 3 comments · Fixed by #22295
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Include details about reading extern static mut in the FFI tutorial. #9980

nejucomo opened this issue Oct 20, 2013 · 3 comments · Fixed by #22295

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@nejucomo
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The FFI tutorial section 8 Accessing foreign globals describes writing an extern static mut, but it would be helpful to mention that reading is also unsafe.

The code example has two writes and no reads, so perhaps if the example is also updated with a read it may save some readers some trouble.
@pnkfelix
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part of #11755

@steveklabnik
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Is static mut even a thing anymore?

@alexcrichton
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It is indeed. You can interface with foreign globals in C via a static mut.

steveklabnik added a commit to steveklabnik/rust that referenced this issue Feb 13, 2015
@steveklabnik
Enhance static mut example in FFI chapter.
ece19bf 
Fixes rust-lang#9980
@steveklabnik steveklabnik mentioned this issue Feb 13, 2015
Merged
steveklabnik added a commit to steveklabnik/rust that referenced this issue Feb 14, 2015
@steveklabnik
Rollup merge of rust-lang#22295 - steveklabnik:gh9980, r=alexcrichton
f029a74 
Fixes rust-lang#9980
steveklabnik added a commit to steveklabnik/rust that referenced this issue Feb 15, 2015
@steveklabnik
Rollup merge of rust-lang#22295 - steveklabnik:gh9980, r=alexcrichton
a3a1f86 
Fixes rust-lang#9980
Manishearth added a commit to Manishearth/rust that referenced this issue Feb 15, 2015
@Manishearth
Rollup merge of rust-lang#22295 - steveklabnik:gh9980, r=alexcrichton
0f66e31 
 Fixes rust-lang#9980
flip1995 pushed a commit to flip1995/rust that referenced this issue Dec 1, 2022
@bors
Auto merge of rust-lang#9980 - Jarcho:issue_9960, r=xFrednet
e9a8b8c 
Don't lint `unnecessary_cast` in mixed macro context

fixes rust-lang#9960

Time to start making a dent in this onslaught.

changelog: `unnecessary_cast`: Don't lint when the identifiers context differs from its binding's context for locals
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Enhance static mut example in FFI chapter. steveklabnik/rust
4 participants
@steveklabnik @alexcrichton @pnkfelix @nejucomo