- Feature Name:
- Start Date: 2015-10-04
- RFC PR: rust-lang/rfcs#1307
- Rust Issue: rust-lang/rust#29453
Add some additional utility methods to OsString and OsStr.
OsString and OsStr are extremely bare at the moment; some utilities would make them easier to work with. The given set of utilities is taken from String, and don't add any additional restrictions to the implementation.
I don't think any of the proposed methods are controversial.
Add the following methods to OsString:
/// Creates a new `OsString` with the given capacity. The string will be able /// to hold exactly `capacity` bytes without reallocating. If `capacity` is 0, /// the string will not allocate. /// /// See main `OsString` documentation information about encoding. fn with_capacity(capacity: usize) -> OsString; /// Truncates `self` to zero length. fn clear(&mut self); /// Returns the number of bytes this `OsString` can hold without reallocating. /// /// See `OsString` introduction for information about encoding. fn capacity(&self) -> usize; /// Reserves capacity for at least `additional` more bytes to be inserted in the /// given `OsString`. The collection may reserve more space to avoid frequent /// reallocations. fn reserve(&mut self, additional: usize); /// Reserves the minimum capacity for exactly `additional` more bytes to be /// inserted in the given `OsString`. Does nothing if the capacity is already /// sufficient. /// /// Note that the allocator may give the collection more space than it /// requests. Therefore capacity can not be relied upon to be precisely /// minimal. Prefer reserve if future insertions are expected. fn reserve_exact(&mut self, additional: usize);
Add the following methods to OsStr:
/// Checks whether `self` is empty. fn is_empty(&self) -> bool; /// Returns the number of bytes in this string. /// /// See `OsStr` introduction for information about encoding. fn len(&self) -> usize;
The meaning of
len() might be a bit confusing because it's the size of
the internal representation on Windows, which isn't otherwise visible to the