examples and tests
This commit is contained in:
parent
2c0a770f9f
commit
e6163ea626
4 changed files with 52 additions and 4 deletions
|
@ -31,5 +31,5 @@ fn main() {
|
|||
|
||||
// you can also call the lens as a function to modify the value
|
||||
let res = lens(a, |v| v + 1);
|
||||
assert_eq!(res, ((1, 3), 3));
|
||||
assert_eq!(res, ((1, 6), 3));
|
||||
}
|
||||
|
|
27
examples/struct_fields.rs
Normal file
27
examples/struct_fields.rs
Normal file
|
@ -0,0 +1,27 @@
|
|||
use bad_optics::lenses::*;
|
||||
|
||||
#[derive(Debug, PartialEq, Clone)]
|
||||
struct MyStruct {
|
||||
hey: (u8, (u8, i32)),
|
||||
}
|
||||
|
||||
fn main() {
|
||||
// make a lens for Hello
|
||||
let hey = lens(
|
||||
|hello: MyStruct| hello.hey,
|
||||
|mut hello: MyStruct, v| {
|
||||
hello.hey = v;
|
||||
hello
|
||||
},
|
||||
);
|
||||
|
||||
let my_struct = MyStruct { hey: (1, (2, -3)) };
|
||||
|
||||
// the thing we want to access
|
||||
let thing = (my_struct, "hello");
|
||||
|
||||
// a lens that targets the -3 inside my_struct
|
||||
let lens_that_targets_the_i32 = _0 + hey + _1 + _1;
|
||||
|
||||
assert_eq!(lens_that_targets_the_i32(thing), -3);
|
||||
}
|
|
@ -213,4 +213,28 @@ mod tests {
|
|||
let hello = Hello { hey: 8 };
|
||||
assert_eq!(l(hello, |v| v + 1), Hello { hey: 9 });
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn convoluted_example() {
|
||||
#[derive(Debug, PartialEq, Clone)]
|
||||
struct Hello2 {
|
||||
hey: (u8, (u8, i32)),
|
||||
}
|
||||
|
||||
// make a lens for Hello
|
||||
let l = lens(
|
||||
|hello: Hello2| hello.hey,
|
||||
|mut hello: Hello2, v| {
|
||||
hello.hey = v;
|
||||
hello
|
||||
},
|
||||
);
|
||||
|
||||
let thing = Hello2 { hey: (1, (2, -3)) };
|
||||
let thing = (thing, "hello");
|
||||
|
||||
let lens_that_targets_the_i32 = _0 + l + _1 + _1;
|
||||
|
||||
assert_eq!(lens_that_targets_the_i32(thing), -3);
|
||||
}
|
||||
}
|
||||
|
|
|
@ -88,7 +88,4 @@ mod tests {
|
|||
assert_eq!(review(_Some, 3), Some(3));
|
||||
assert_eq!(review(_None, ()), None::<()>);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn view_combination() {}
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue