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manual: add borrow operator to symbolic unary operator list; mention copy and move.

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Graydon Hoare 2012-10-11 13:11:07 -07:00
parent e257f390e1
commit c46706fffd
1 changed files with 9 additions and 5 deletions
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doc/rust.md
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@ -1636,8 +1636,9 @@ task in a _failing state_.
### Unary operator expressions
Rust defines five unary operators. They are all written as prefix
operators, before the expression they apply to.
Rust defines six symbolic unary operators,
in addition to the unary [copy](#unary-copy-expressions) and [move](#unary-move-expressions) operators.
They are all written as prefix operators, before the expression they apply to.
`-`
: Negation. May only be applied to numeric types.
@ -1652,9 +1653,12 @@ operators, before the expression they apply to.
`false`. On integer types, this inverts the individual bits in the
two's complement representation of the value.
`@` and `~`
: [Boxing](#box-types) operators. Allocate a box to hold the value
they are applied to, and store the value in it. `@` creates a
shared, reference-counted box, whereas `~` creates a unique box.
: [Boxing](#pointer-types) operators. Allocate a box to hold the value they are applied to,
and store the value in it. `@` creates a managed box, whereas `~` creates an owned box.
`&`
: Borrow operator. Returns a borrowed pointer, pointing to its operand.
The operand of a borrowed pointer is statically proven to outlive the resulting pointer.
If the borrow-checker cannot prove this, it is a compilation error.
### Binary operator expressions