github_mirrors/rust-book-cn
1
0
Fork 0
mirror of https://github.com/rust-lang-cn/book-cn.git synced 2025-02-02 23:38:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

We did see namespaces a bit, in ownership with String::from

Browse Source
This commit is contained in:
Carol (Nichols || Goulding) 2016-07-21 21:50:45 -04:00
parent 507a668cb0
commit c56d76de65
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/ch05-00-structs.md
View File

@ -74,12 +74,13 @@ f64::powi(2.0, 3)
```
The double colon (`::`) here is a namespace operator. We haven’t talked about
modules yet, but you can think of the `powi()` function as being scoped inside
of another name. In this case, the name is `f64`, the same as the type. The
`powi()` function takes two arguments: the first is a number, and the second is
the power that it raises that number to. In this case, the second number is an
integer, hence the ‘i’ in its name. Similarly, `sqrt()` is a function under the
`f64` module, which takes the square root of its argument.
modules and namespaces in depth yet, but you can think of the `powi()` function
as being scoped inside of another name. In this case, the name is `f64`, the
same as the type. The `powi()` function takes two arguments: the first is a
number, and the second is the power that it raises that number to. In this
case, the second number is an integer, hence the ‘i’ in its name. Similarly,
`sqrt()` is a function under the `f64` module, which takes the square root of
its argument.
## Why `struct`s?