Struct ctxmap::CtxMap

pub struct CtxMap<S> { /* fields omitted */ }

A collection that can store references of different types and lifetimes.

Implementations

impl<S: CtxMapSchema> CtxMap<S>

pub fn new() -> Self

Create a new CtxMap with initial values.

Example

ctxmap::schema!(S);
ctxmap::key!(S { KEY_A: u16 = 20 });
ctxmap::key!(S { KEY_B: u8 });

let m = ctxmap::CtxMap::new();
assert_eq!(m[&KEY_A], 20);
assert_eq!(m[&KEY_B], 0);

pub fn with<T: ?Sized + 'static, U>(
    &mut self,
    key: &CtxMapKey<S, T>,
    value: &T,
    f: impl FnOnce(&mut Self) -> U
) -> U

Sets a value to CtxMap only while f is being called.

Example

ctxmap::schema!(S);
ctxmap::key!(S { KEY_A: u16 = 20 });

let mut m = ctxmap::CtxMap::new();
assert_eq!(m[&KEY_A], 20);
m.with(&KEY_A, &30, |m| {
    assert_eq!(m[&KEY_A], 30);
});
assert_eq!(m[&KEY_A], 20);

Trait Implementations

impl<S: CtxMapSchema> Default for CtxMap<S>

fn default() -> Self

Returns the “default value” for a type.

impl<S: CtxMapSchema, T: ?Sized + 'static> Index<&'_ CtxMapKey<S, T>> for CtxMap<S>

type Output = T

The returned type after indexing.

fn index(&self, index: &CtxMapKey<S, T>) -> &Self::Output

Performs the indexing (container[index]) operation.