A Rust library for strongly-typed string keys for configuration.
APACHE-2.0 License
Strongly-typed string keys for configuration.
A frequent task is to extract a typed value from an untyped Map<String, Object>
.
Typically, this is done via string keys: let port: u32 = map.get("port")?.parse()?
.
A slightly more type-safe approach is to associate certain types with corresponding
string constants:
#[macro_use]
extern crate typed_key;
use typed_key::Key;
// `PORT` is basically `"port"` string with associated `u32` type.
const PORT: Key<u32> = typed_key!("port");
This crate provides basic building block for such strongly-typed strings. See example for a complete example of reading configuration, and the blog post for a more long winded explanation of the pattern.
Using string keys is totally fine for small isolated cases, but if this pattern
is pervasive, typed_key
can provide the following benefits: