mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Update Contributing.md

Browse Source
This commit is contained in:
topecongiro 2017-10-05 20:50:50 +09:00
parent fe69dde96b
commit ce8e645537
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Contributing.md
View File

@ -184,13 +184,13 @@ places) is for the caller to shuffle around some of its other items to make
more width, then call the function again with more space.
Since it is common for callers to bail out when a callee fails, we often use a
`try_opt!` macro to make this pattern more succinct.
`?` operator to make this pattern more succinct.
One way we might find out that we don't have enough space is when computing how much
space we have. Something like `available_space = budget - overhead`. Since
widths are unsized integers, this would cause underflow. Therefore we use
checked subtraction: `available_space = try_opt!(budget.checked_sub(overhead))`.
`checked_sub` returns an `Option`, and if we would underflow `try_opt!` returns
checked subtraction: `available_space = budget.checked_sub(overhead)?`.
`checked_sub` returns an `Option`, and if we would underflow `?` returns
`None`, otherwise we proceed with the computed space.
Much syntax in Rust is lists: lists of arguments, lists of fields, lists of