pub struct Config<D: ConfigDefault> {
pub(crate) name: &'static str,
pub(crate) desc: &'static str,
pub(crate) default: D,
}
Expand description
A handle to a dynamically updatable configuration value.
This represents a strongly-typed named config of type T
. It may be
registered to a set of such configs with ConfigSet::add and then later
used to retrieve the latest value at any time with Self::get.
The supported types are bool, usize, Duration, and String, as well as Option variants of these as necessary.
Fields§
§name: &'static str
§desc: &'static str
§default: D
Implementations§
Source§impl<D: ConfigDefault> Config<D>
impl<D: ConfigDefault> Config<D>
Sourcepub const fn new(name: &'static str, default: D, desc: &'static str) -> Self
pub const fn new(name: &'static str, default: D, desc: &'static str) -> Self
Constructs a handle for a config of type T
.
It is best practice, but not strictly required, for the name to be globally unique within a process.
TODO(cfg): Add some sort of categorization of config purpose here: e.g.
limited-lifetime rollout flag, CYA, magic number that we never expect to
tune, magic number that we DO expect to tune, etc. This could be used to
power something like a --future-default-flags
for CI, to replace part
or all of the manually maintained list.
TODO(cfg): See if we can make this more Rust-y and take these params as a struct (the obvious thing hits some issues with const combined with Drop).
Sourcepub fn get(&self, set: &ConfigSet) -> D::ConfigType
pub fn get(&self, set: &ConfigSet) -> D::ConfigType
Returns the latest value of this config within the given set.
Panics if this config was not previously registered to the set.
TODO(cfg): Decide if this should be a method on ConfigSet
instead to
match the precedent of BTreeMap/HashMap::get
taking a key. It’s like
this initially because it was thought that the Config
definition was
the more important “noun” and also that rustfmt would maybe work better
on this ordering.
Sourcepub fn handle(&self, set: &ConfigSet) -> ConfigValHandle<D::ConfigType>
pub fn handle(&self, set: &ConfigSet) -> ConfigValHandle<D::ConfigType>
Returns a handle to the value of this config in the given set.
This allows users to amortize the cost of the name lookup.
Returns the shared value of this config in the given set.
Trait Implementations§
Auto Trait Implementations§
impl<D> Freeze for Config<D>where
D: Freeze,
impl<D> RefUnwindSafe for Config<D>where
D: RefUnwindSafe,
impl<D> Send for Config<D>where
D: Send,
impl<D> Sync for Config<D>where
D: Sync,
impl<D> Unpin for Config<D>where
D: Unpin,
impl<D> UnwindSafe for Config<D>where
D: UnwindSafe,
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