Struct gstreamer::format::Default

pub struct Default(pub Option<u64>);

Methods from Deref<Target = Option<u64>>

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_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

Convert 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_mut(&mut self) -> Option<&mut T>

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

Examples

let mut x = Some(2);
match x.as_mut() {
    Some(v) => *v = 42,
    None => {},
}
assert_eq!(x, Some(42));

pub fn as_pin_mut(self: PinMut<'a, Option<T>>) -> Option<PinMut<'a, T>>

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

Converts from Option<T> to Option<PinMut<'_, T>>

Important traits for Iter<'a, A>

impl<'a, A> Iterator for Iter<'a, A> type Item = &'a A;

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);

Important traits for IterMut<'a, A>

impl<'a, A> Iterator for IterMut<'a, A> type Item = &'a mut A;

pub fn iter_mut(&mut self) -> IterMut<T>

Returns a mutable iterator over the possibly contained value.

Examples

let mut x = Some(4);
match x.iter_mut().next() {
    Some(v) => *v = 42,
    None => {},
}
assert_eq!(x, Some(42));

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

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_or_insert(&mut self, v: T) -> &mut T

Inserts v into the option if it is None, then returns a mutable reference to the contained value.

Examples

let mut x = None;

{
    let y: &mut u32 = x.get_or_insert(5);
    assert_eq!(y, &5);

    *y = 7;
}

assert_eq!(x, Some(7));

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_or_insert_with<F>(&mut self, f: F) -> &mut T where     F: FnOnce() -> T,

Inserts a value computed from f into the option if it is None, then returns a mutable reference to the contained value.

Examples

let mut x = None;

{
    let y: &mut u32 = x.get_or_insert_with(|| 5);
    assert_eq!(y, &5);

    *y = 7;
}

assert_eq!(x, Some(7));

pub fn take(&mut self) -> Option<T>

Takes the value out of the option, leaving a None in its place.

Examples

let mut x = Some(2);
x.take();
assert_eq!(x, None);

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

Trait Implementations

impl PartialEq for Default

fn eq(&self, other: &Default) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Default) -> bool

This method tests for !=.

impl Eq for Default

impl PartialOrd for Default

fn partial_cmp(&self, other: &Default) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Default) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Default) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Default) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Default) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Ord for Default

fn cmp(&self, other: &Default) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl Hash for Default

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

Feeds a slice of this type into the given [Hasher].

impl Clone for Default

fn clone(&self) -> Default

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Default

impl Debug for Default

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Default for Default

fn default() -> Default

Returns the "default value" for a type.

impl From<Default> for GenericFormattedValue

fn from(v: Default) -> GenericFormattedValue

Performs the conversion.

impl FormattedValue for Default

fn get_default_format() -> Format

fn try_from(v: GenericFormattedValue) -> Option<Self>

fn get_format(&self) -> Format

unsafe fn from_raw(format: Format, value: i64) -> Self

unsafe fn to_raw_value(&self) -> i64

impl SpecificFormattedValue for Default

impl From<u64> for Default

fn from(v: u64) -> Default

Performs the conversion.

impl From<Option<u64>> for Default

fn from(v: Option<u64>) -> Default

Performs the conversion.

impl Into<Option<u64>> for Default

fn into(self) -> Option<u64>

Performs the conversion.

impl Deref for Default

type Target = Option<u64>

The resulting type after dereferencing.

fn deref(&self) -> &Option<u64>

Dereferences the value.

impl DerefMut for Default

fn deref_mut(&mut self) -> &mut Option<u64>

Mutably dereferences the value.

impl AsRef<Option<u64>> for Default

fn as_ref(&self) -> &Option<u64>

Performs the conversion.

impl AsMut<Option<u64>> for Default

fn as_mut(&mut self) -> &mut Option<u64>

Performs the conversion.

impl Add<Default> for Default

type Output = Default

The resulting type after applying the + operator.

fn add(self, other: Default) -> Default

Performs the + operation.

impl<'a> Add<&'a Default> for Default

type Output = Default

The resulting type after applying the + operator.

fn add(self, other: &'a Default) -> Default

Performs the + operation.

impl AddAssign<Default> for Default

fn add_assign(&mut self, other: Default)

Performs the += operation.

impl<'a> AddAssign<&'a Default> for Default

fn add_assign(&mut self, other: &'a Default)

Performs the += operation.

impl Sub<Default> for Default

type Output = Default

The resulting type after applying the - operator.

fn sub(self, other: Default) -> Default

Performs the - operation.

impl<'a> Sub<&'a Default> for Default

type Output = Default

The resulting type after applying the - operator.

fn sub(self, other: &'a Default) -> Default

Performs the - operation.

impl SubAssign<Default> for Default

fn sub_assign(&mut self, other: Default)

Performs the -= operation.

impl<'a> SubAssign<&'a Default> for Default

fn sub_assign(&mut self, other: &'a Default)

Performs the -= operation.

impl Mul<Default> for Default

type Output = Default

The resulting type after applying the * operator.

fn mul(self, other: Default) -> Default

Performs the * operation.

impl<'a> Mul<&'a Default> for Default

type Output = Default

The resulting type after applying the * operator.

fn mul(self, other: &'a Default) -> Default

Performs the * operation.

impl MulAssign<Default> for Default

fn mul_assign(&mut self, other: Default)

Performs the *= operation.

impl<'a> MulAssign<&'a Default> for Default

fn mul_assign(&mut self, other: &'a Default)

Performs the *= operation.

impl Div<Default> for Default

type Output = Default

The resulting type after applying the / operator.

fn div(self, other: Default) -> Default

Performs the / operation.

impl<'a> Div<&'a Default> for Default

type Output = Default

The resulting type after applying the / operator.

fn div(self, other: &'a Default) -> Default

Performs the / operation.

impl DivAssign<Default> for Default

fn div_assign(&mut self, other: Default)

Performs the /= operation.

impl<'a> DivAssign<&'a Default> for Default

fn div_assign(&mut self, other: &'a Default)

Performs the /= operation.

impl Rem<Default> for Default

type Output = Default

The resulting type after applying the % operator.

fn rem(self, other: Default) -> Default

Performs the % operation.

impl<'a> Rem<&'a Default> for Default

type Output = Default

The resulting type after applying the % operator.

fn rem(self, other: &'a Default) -> Default

Performs the % operation.

impl RemAssign<Default> for Default

fn rem_assign(&mut self, other: Default)

Performs the %= operation.

impl<'a> RemAssign<&'a Default> for Default

fn rem_assign(&mut self, other: &'a Default)

Performs the %= operation.

impl Mul<u64> for Default

type Output = Default

The resulting type after applying the * operator.

fn mul(self, other: u64) -> Default

Performs the * operation.

impl<'a> Mul<&'a u64> for Default

type Output = Default

The resulting type after applying the * operator.

fn mul(self, other: &'a u64) -> Default

Performs the * operation.

impl MulAssign<u64> for Default

fn mul_assign(&mut self, other: u64)

Performs the *= operation.

impl<'a> MulAssign<&'a u64> for Default

fn mul_assign(&mut self, other: &'a u64)

Performs the *= operation.

impl Div<u64> for Default

type Output = Default

The resulting type after applying the / operator.

fn div(self, other: u64) -> Default

Performs the / operation.

impl<'a> Div<&'a u64> for Default

type Output = Default

The resulting type after applying the / operator.

fn div(self, other: &'a u64) -> Default

Performs the / operation.

impl DivAssign<u64> for Default

fn div_assign(&mut self, other: u64)

Performs the /= operation.

impl<'a> DivAssign<&'a u64> for Default

fn div_assign(&mut self, other: &'a u64)

Performs the /= operation.

impl Rem<u64> for Default

type Output = Default

The resulting type after applying the % operator.

fn rem(self, other: u64) -> Default

Performs the % operation.

impl<'a> Rem<&'a u64> for Default

type Output = Default

The resulting type after applying the % operator.

fn rem(self, other: &'a u64) -> Default

Performs the % operation.

impl RemAssign<u64> for Default

fn rem_assign(&mut self, other: u64)

Performs the %= operation.

impl<'a> RemAssign<&'a u64> for Default

fn rem_assign(&mut self, other: &'a u64)

Performs the %= operation.

impl Mul<Default> for u64

type Output = Default

The resulting type after applying the * operator.

fn mul(self, other: Default) -> Default

Performs the * operation.

impl<'a> Mul<&'a Default> for u64

type Output = Default

The resulting type after applying the * operator.

fn mul(self, other: &'a Default) -> Default

Performs the * operation.

impl MulDiv<Default> for Default

type Output = Default

fn mul_div_floor(self, num: Default, denom: Default) -> Option<Self::Output>

Calculates floor(val * num / denom), i.e. the next integer to the result of the division with the smaller absolute value.

fn mul_div_round(self, num: Default, denom: Default) -> Option<Self::Output>

Calculates round(val * num / denom), i.e. the closest integer to the result of the division. If both surrounding integers are the same distance, the one with the bigger absolute value is returned.

fn mul_div_ceil(self, num: Default, denom: Default) -> Option<Self::Output>

Calculates ceil(val * num / denom), i.e. the next integer to the result of the division with the bigger absolute value.

impl<'a> MulDiv<&'a Default> for Default

type Output = Default

fn mul_div_floor(self, num: &Default, denom: &Default) -> Option<Self::Output>

Calculates floor(val * num / denom), i.e. the next integer to the result of the division with the smaller absolute value.

fn mul_div_round(self, num: &Default, denom: &Default) -> Option<Self::Output>

Calculates round(val * num / denom), i.e. the closest integer to the result of the division. If both surrounding integers are the same distance, the one with the bigger absolute value is returned.

fn mul_div_ceil(self, num: &Default, denom: &Default) -> Option<Self::Output>

Calculates ceil(val * num / denom), i.e. the next integer to the result of the division with the bigger absolute value.

impl<'a> MulDiv<u64> for Default

type Output = Default

fn mul_div_floor(self, num: u64, denom: u64) -> Option<Self::Output>

Calculates floor(val * num / denom), i.e. the next integer to the result of the division with the smaller absolute value.

fn mul_div_round(self, num: u64, denom: u64) -> Option<Self::Output>

Calculates round(val * num / denom), i.e. the closest integer to the result of the division. If both surrounding integers are the same distance, the one with the bigger absolute value is returned.

fn mul_div_ceil(self, num: u64, denom: u64) -> Option<Self::Output>

Calculates ceil(val * num / denom), i.e. the next integer to the result of the division with the bigger absolute value.

impl<'a> MulDiv<&'a u64> for Default

type Output = Default

fn mul_div_floor(self, num: &u64, denom: &u64) -> Option<Self::Output>

Calculates floor(val * num / denom), i.e. the next integer to the result of the division with the smaller absolute value.

fn mul_div_round(self, num: &u64, denom: &u64) -> Option<Self::Output>

Calculates round(val * num / denom), i.e. the closest integer to the result of the division. If both surrounding integers are the same distance, the one with the bigger absolute value is returned.

fn mul_div_ceil(self, num: &u64, denom: &u64) -> Option<Self::Output>

Calculates ceil(val * num / denom), i.e. the next integer to the result of the division with the bigger absolute value.