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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
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doc/rust.md
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@ -1636,8 +1636,9 @@ task in a _failing state_.
### Unary operator expressions ### Unary operator expressions
Rust defines five unary operators. They are all written as prefix Rust defines six symbolic unary operators,
operators, before the expression they apply to. 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. : 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 `false`. On integer types, this inverts the individual bits in the
two's complement representation of the value. two's complement representation of the value.
`@` and `~` `@` and `~`
: [Boxing](#box-types) operators. Allocate a box to hold the value : [Boxing](#pointer-types) operators. Allocate a box to hold the value they are applied to,
they are applied to, and store the value in it. `@` creates a and store the value in it. `@` creates a managed box, whereas `~` creates an owned box.
shared, reference-counted box, whereas `~` creates a unique 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 ### Binary operator expressions