[−][src]Crate loosen
Loosen
Declares a derive-like function attr macro which creates another wrap-like function with single tuple-loosened argument, retrieved from the former function.
Upon call, the loosened function propagates the call with the flattened input tuple as arguments to the original function.
Example
#[loose] fn fa(a: A, b: B) {} // normal call fa(A, B); // loose call let args = (A, B); fa_loose(args); // ie. instead of two arguments, // there is only a single tuple argument // another usage exaple (0..10) .map(|_| (A, B)) .map(fa_loose) .collect::<Vec<_>>();
Note
This is a draft and is my first try on proc-macros. I suggested this as an rfc before realising a proc macro would suffice: https://github.com/rust-lang/rfcs/issues/2667
Attribute Macros
| loose | For a function |