Struct jack_sys::jack_get_cycle_times

pub struct jack_get_cycle_times { /* private fields */ }

Methods from Deref<Target = Option<unsafe extern "C" fn(client: *const jack_client_t, current_frames: *mut jack_nframes_t, current_usecs: *mut jack_time_t, next_usecs: *mut jack_time_t, period_usecs: *mut c_float) -> c_int>>

pub fn is_some(&self) -> bool

Returns true if the option is a Some value.

Examples

let x: Option<u32> = Some(2);
assert_eq!(x.is_some(), true);

let x: Option<u32> = None;
assert_eq!(x.is_some(), false);

pub fn is_some_with(&self, f: impl FnOnce(&T) -> bool) -> bool

🔬 This is a nightly-only experimental API. (is_some_with)

Returns true if the option is a Some wrapping a value matching the predicate.

Examples

#![feature(is_some_with)]

let x: Option<u32> = Some(2);
assert_eq!(x.is_some_with(|&x| x > 1), true);

let x: Option<u32> = Some(0);
assert_eq!(x.is_some_with(|&x| x > 1), false);

let x: Option<u32> = None;
assert_eq!(x.is_some_with(|&x| x > 1), false);

pub fn is_none(&self) -> bool

Returns true if the option is a None value.

Examples

let x: Option<u32> = Some(2);
assert_eq!(x.is_none(), false);

let x: Option<u32> = None;
assert_eq!(x.is_none(), true);

pub fn as_ref(&self) -> Option<&T>

Converts from &Option<T> to Option<&T>.

Examples

Converts an Option<String> into an Option<usize>, preserving the original. The map method takes the self argument by value, consuming the original, so this technique uses as_ref to first take an Option to a reference to the value inside the original.

let text: Option<String> = Some("Hello, world!".to_string());
// First, cast `Option<String>` to `Option<&String>` with `as_ref`,
// then consume *that* with `map`, leaving `text` on the stack.
let text_length: Option<usize> = text.as_ref().map(|s| s.len());
println!("still can print text: {:?}", text);

pub fn as_pin_ref(self: Pin<&Option<T>>) -> Option<Pin<&T>>

Converts from Pin<&Option<T>> to Option<Pin<&T>>.

pub fn as_pin_mut(self: Pin<&mut Option<T>>) -> Option<Pin<&mut T>>

Converts from Pin<&mut Option<T>> to Option<Pin<&mut T>>.

pub fn as_deref(&self) -> Option<&<T as Deref>::Target> where
    T: Deref, 

Converts from Option<T> (or &Option<T>) to Option<&T::Target>.

Leaves the original Option in-place, creating a new one with a reference to the original one, additionally coercing the contents via Deref.

Examples

let x: Option<String> = Some("hey".to_owned());
assert_eq!(x.as_deref(), Some("hey"));

let x: Option<String> = None;
assert_eq!(x.as_deref(), None);

pub fn iter(&self) -> Iter<'_, T>

Returns an iterator over the possibly contained value.

Examples

let x = Some(4);
assert_eq!(x.iter().next(), Some(&4));

let x: Option<u32> = None;
assert_eq!(x.iter().next(), None);

pub fn contains<U>(&self, x: &U) -> bool where
    U: PartialEq<T>, 

🔬 This is a nightly-only experimental API. (option_result_contains)

Returns true if the option is a Some value containing the given value.

Examples

#![feature(option_result_contains)]

let x: Option<u32> = Some(2);
assert_eq!(x.contains(&2), true);

let x: Option<u32> = Some(3);
assert_eq!(x.contains(&2), false);

let x: Option<u32> = None;
assert_eq!(x.contains(&2), false);

Trait Implementations

impl Deref for jack_get_cycle_times

type Target = Option<unsafe extern "C" fn(client: *const jack_client_t, current_frames: *mut jack_nframes_t, current_usecs: *mut jack_time_t, next_usecs: *mut jack_time_t, period_usecs: *mut c_float) -> c_int>

The resulting type after dereferencing.

fn deref(
    &self
) -> &Option<unsafe extern "C" fn(client: *const jack_client_t, current_frames: *mut jack_nframes_t, current_usecs: *mut jack_time_t, next_usecs: *mut jack_time_t, period_usecs: *mut c_float) -> c_int>

Dereferences the value.

impl LazyStatic for jack_get_cycle_times