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| author | NODA, Kai <nodakai@gmail.com> | 2016-02-15 08:05:07 +0800 |
|---|---|---|
| committer | NODA, Kai <nodakai@gmail.com> | 2016-03-07 04:42:14 +0800 |
| commit | 559683cdedf09bc58c468ab5eb0d7b19e57aeb61 (patch) | |
| tree | a6be86522387afe6df8458e6ada62db17056eeb3 | |
| parent | 71f4658c14c63be2c9e6dbf85e46c10cf20fed71 (diff) | |
| download | rust-559683cdedf09bc58c468ab5eb0d7b19e57aeb61.tar.gz rust-559683cdedf09bc58c468ab5eb0d7b19e57aeb61.zip | |
reference.md: clarify negation.
Signed-off-by: NODA, Kai <nodakai@gmail.com>
| -rw-r--r-- | src/doc/reference.md | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/doc/reference.md b/src/doc/reference.md index c2b22ef3e72..a94609a8b0c 100644 --- a/src/doc/reference.md +++ b/src/doc/reference.md @@ -379,6 +379,10 @@ Examples of integer literals of various forms: 0usize; // type usize ``` +Note that the Rust syntax considers `-1i8` as an application of the [unary minus +operator](#unary-operator-expressions) to an integer literal `1i8`, rather than +a single integer literal. + ##### Floating-point literals A _floating-point literal_ has one of two forms: @@ -2776,7 +2780,9 @@ Rust defines the following unary operators. They are all written as prefix opera before the expression they apply to. * `-` - : Negation. May only be applied to numeric types. + : Negation. Signed integer types and floating-point types support negation. It + is an error to apply negation to unsigned types; for example, the compiler + rejects `-1u32`. * `*` : Dereference. When applied to a [pointer](#pointer-types) it denotes the pointed-to location. For pointers to mutable locations, the resulting |