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RC module documentation concerning immutability is misleading #44105

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justintaft opened this issue Aug 26, 2017 · 0 comments
Closed

RC module documentation concerning immutability is misleading #44105

justintaft opened this issue Aug 26, 2017 · 0 comments
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A-docs Area: documentation for any part of the project, including the compiler, standard library, and tools C-enhancement Category: An issue proposing an enhancement or a PR with one.

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@justintaft
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justintaft commented Aug 26, 2017 •
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RC module documentation should clarify mutable references can be obtained, under certain conditions.

Rc module documentation sates:
"Shared references in Rust disallow mutation by default, and Rc is no exception: you cannot obtain a mutable reference to something inside an Rc."

https://doc.rust-lang.org/std/rc/

Rc's get_mut method states:
"Returns a mutable reference to the inner value, if there are no other Rc or Weak pointers to the same value.".

https://doc.rust-lang.org/std/rc/struct.Rc.html#method.get_mut
@justintaft justintaft changed the title [doc] RC module immutability documentation misleading [doc] RC module documentation concerning immutability is misleading Aug 26, 2017
@QuietMisdreavus QuietMisdreavus added the A-docs Area: documentation for any part of the project, including the compiler, standard library, and tools label Aug 26, 2017
@Mark-Simulacrum Mark-Simulacrum added the C-enhancement Category: An issue proposing an enhancement or a PR with one. label Aug 26, 2017
@steveklabnik steveklabnik changed the title [doc] RC module documentation concerning immutability is misleading RC module documentation concerning immutability is misleading Oct 5, 2017
steveklabnik added a commit to steveklabnik/rust that referenced this issue Oct 5, 2017
@steveklabnik
Modify Rc/Arc language around mutability
5e251b7 
There are a few exceptions to the rule that Arc/Rc are immutable. Rather
than dig into the details, add "generally" to hint at this difference,
as it's kind of a distraction at this point in the docs.

Additionally, Arc's docs were slightly different here generally, so add
in both the existing language and the exception.

Fixes rust-lang#44105
@steveklabnik steveklabnik mentioned this issue Oct 5, 2017
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kennytm added a commit to kennytm/rust that referenced this issue Oct 8, 2017
@kennytm
Rollup merge of rust-lang#45052 - steveklabnik:gh44105, r=dtolnay
c238df1 
Modify Rc/Arc language around mutability

There are a few exceptions to the rule that Arc/Rc are immutable. Rather
than dig into the details, add "generally" to hint at this difference,
as it's kind of a distraction at this point in the docs.

Additionally, Arc's docs were slightly different here generally, so add
in both the existing language and the exception.

Fixes rust-lang#44105
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@Mark-Simulacrum @QuietMisdreavus @justintaft