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corrected imprecision in description of mutable fields

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John Clements 2013-01-10 16:28:36 -08:00 committed by Brian Anderson
parent 42095221f4
commit 08275826ca
1 changed files with 8 additions and 2 deletions
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doc/tutorial.md
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@ -562,7 +562,12 @@ Structs are quite similar to C structs and are even laid out the same way in
memory (so you can read from a Rust struct in C, and vice-versa). Use the dot
operator to access struct fields, as in `mypoint.x`.
Fields that you want to mutate must be explicitly marked `mut`.
Inherited mutability means that any field of a struct may be mutable, if the
struct is in a mutable slot (or a field of a struct in a mutable slot, and
so forth).
A struct that is not mutable due to inherited mutability may declare some
of its fields nevertheless mutable, using the `mut` keyword.
~~~~
struct Stack {
@ -572,7 +577,8 @@ struct Stack {
~~~~
With a value of such a type, you can do `mystack.head += 1`. If `mut` were
omitted from the type, such an assignment would result in a type error.
omitted from the type, such an assignment to a struct without inherited
mutability would result in a type error.
`match` patterns destructure structs. The basic syntax is
`Name { fieldname: pattern, ... }`: