
chainer
A cursed crate that allows for global call chaining with access to chained function results
Currently the results
feature requires the min_specialization
Rust Nightly feature.
Usage
[dependencies]
chainer = "*"
[dependencies]
chainer = { version = "*", features = ["results"] }
Examples
Basic usage (default)
Immutable call chaining
use chainer::*;
struct HelloWorld;
impl HelloWorld {
fn print(&self) {
println!("Hello, world!");
}
}
fn main() {
HelloWorld
.chain(HelloWorld::print)
.chain(HelloWorld::print)
.chain(HelloWorld::print);
}
Mutable call chaining
use chainer::*;
struct Counter { value: i32 }
impl Counter {
fn increment(&mut self) {
self.value += 1;
println!("{}", self.value);
}
}
fn main() {
Counter { value: 0 }
.chain_mut(Counter::increment)
.chain_mut(Counter::increment)
.chain_mut(Counter::increment);
}
features = ["results"]
Immutable call chaining
use chainer::*;
struct HelloWorld;
impl HelloWorld {
fn print(&self) -> &'static str {
println!("Hello, world!");
"It works!"
}
}
fn main() {
let value: &'static str = HelloWorld
.chain(HelloWorld::print)
.chain(HelloWorld::print)
.chain(HelloWorld::print)
.result;
}
Mutable call chaining
use chainer::*;
struct Counter { value: i32 }
impl Counter {
fn increment(&mut self) -> i32 {
self.value += 1;
println!("{}", self.value);
self.value
}
}
fn main() {
let value: i32 = Counter { value: 0 }
.chain_mut(Counter::increment)
.chain_mut(Counter::increment)
.chain_mut(Counter::increment)
.result;
println!("{value}");
}