5 releases (2 stable)
1.1.0 | Oct 16, 2019 |
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1.0.0 | Mar 25, 2019 |
0.0.3 | Apr 30, 2017 |
0.0.2 | Feb 20, 2017 |
0.0.1 | Feb 19, 2017 |
#198 in macOS and iOS APIs
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Objective-C type encoding creation and parsing in Rust.
The Objective-C compiler encodes types as strings for usage in the runtime. This crate aims to provide a strongly-typed (rather than stringly-typed) way to create and describe these type encodings without memory allocation in Rust.
Implementing Encode
This crate declares an Encode
trait that can be implemented for types that
the Objective-C compiler can encode. Implementing this trait looks like:
unsafe impl Encode for CGPoint {
const ENCODING: Encoding<'static> =
Encoding::Struct("CGPoint", &[CGFloat::ENCODING, CGFLOAT::ENCODING]);
}
For an example of how this works with more complex types, like structs
containing structs, see the core_graphics
example.
Comparing with encoding strings
An Encoding
can be compared with an encoding string from the Objective-C
runtime:
assert!(&i32::ENCODING == "i");
Generating encoding strings
Every Encoding
implements Display
as its string representation.
This can be generated conveniently through the to_string
method:
assert_eq!(i32::ENCODING.to_string(), "i");