Struct alsa::mixer::MilliBel
[−]
[src]
pub struct MilliBel(pub i64);
Wrapper for a mB (millibel) value.
Despite some ALSA functions named "dB", they actually take mB values instead. This is a wrapper type to help with those calculations. Its interior is the actual mB value.
Methods
impl MilliBel
[src]
Methods from Deref<Target = i64>
fn count_ones(self) -> u32
1.0.0
Returns the number of ones in the binary representation of self
.
Examples
Basic usage:
let n = -0b1000_0000i8; assert_eq!(n.count_ones(), 1);
fn count_zeros(self) -> u32
1.0.0
Returns the number of zeros in the binary representation of self
.
Examples
Basic usage:
let n = -0b1000_0000i8; assert_eq!(n.count_zeros(), 7);
fn leading_zeros(self) -> u32
1.0.0
Returns the number of leading zeros in the binary representation
of self
.
Examples
Basic usage:
let n = -1i16; assert_eq!(n.leading_zeros(), 0);
fn trailing_zeros(self) -> u32
1.0.0
Returns the number of trailing zeros in the binary representation
of self
.
Examples
Basic usage:
let n = -4i8; assert_eq!(n.trailing_zeros(), 2);
fn rotate_left(self, n: u32) -> i64
1.0.0
Shifts the bits to the left by a specified amount, n
,
wrapping the truncated bits to the end of the resulting integer.
Please note this isn't the same operation as <<
!
Examples
Basic usage:
let n = 0x0123456789ABCDEFi64; let m = -0x76543210FEDCBA99i64; assert_eq!(n.rotate_left(32), m);
fn rotate_right(self, n: u32) -> i64
1.0.0
Shifts the bits to the right by a specified amount, n
,
wrapping the truncated bits to the beginning of the resulting
integer.
Please note this isn't the same operation as >>
!
Examples
Basic usage:
let n = 0x0123456789ABCDEFi64; let m = -0xFEDCBA987654322i64; assert_eq!(n.rotate_right(4), m);
fn swap_bytes(self) -> i64
1.0.0
Reverses the byte order of the integer.
Examples
Basic usage:
let n = 0x0123456789ABCDEFi64; let m = -0x1032547698BADCFFi64; assert_eq!(n.swap_bytes(), m);
fn to_be(self) -> i64
1.0.0
Converts self
to big endian from the target's endianness.
On big endian this is a no-op. On little endian the bytes are swapped.
Examples
Basic usage:
let n = 0x0123456789ABCDEFi64; if cfg!(target_endian = "big") { assert_eq!(n.to_be(), n) } else { assert_eq!(n.to_be(), n.swap_bytes()) }
fn to_le(self) -> i64
1.0.0
Converts self
to little endian from the target's endianness.
On little endian this is a no-op. On big endian the bytes are swapped.
Examples
Basic usage:
let n = 0x0123456789ABCDEFi64; if cfg!(target_endian = "little") { assert_eq!(n.to_le(), n) } else { assert_eq!(n.to_le(), n.swap_bytes()) }
fn checked_add(self, other: i64) -> Option<i64>
1.0.0
Checked integer addition. Computes self + other
, returning None
if overflow occurred.
Examples
Basic usage:
assert_eq!(7i16.checked_add(32760), Some(32767)); assert_eq!(8i16.checked_add(32760), None);
fn checked_sub(self, other: i64) -> Option<i64>
1.0.0
Checked integer subtraction. Computes self - other
, returning
None
if underflow occurred.
Examples
Basic usage:
assert_eq!((-127i8).checked_sub(1), Some(-128)); assert_eq!((-128i8).checked_sub(1), None);
fn checked_mul(self, other: i64) -> Option<i64>
1.0.0
Checked integer multiplication. Computes self * other
, returning
None
if underflow or overflow occurred.
Examples
Basic usage:
assert_eq!(6i8.checked_mul(21), Some(126)); assert_eq!(6i8.checked_mul(22), None);
fn checked_div(self, other: i64) -> Option<i64>
1.0.0
Checked integer division. Computes self / other
, returning None
if other == 0
or the operation results in underflow or overflow.
Examples
Basic usage:
assert_eq!((-127i8).checked_div(-1), Some(127)); assert_eq!((-128i8).checked_div(-1), None); assert_eq!((1i8).checked_div(0), None);
fn checked_rem(self, other: i64) -> Option<i64>
1.7.0
Checked integer remainder. Computes self % other
, returning None
if other == 0
or the operation results in underflow or overflow.
Examples
Basic usage:
use std::i32; assert_eq!(5i32.checked_rem(2), Some(1)); assert_eq!(5i32.checked_rem(0), None); assert_eq!(i32::MIN.checked_rem(-1), None);
fn checked_neg(self) -> Option<i64>
1.7.0
Checked negation. Computes -self
, returning None
if self == MIN
.
Examples
Basic usage:
use std::i32; assert_eq!(5i32.checked_neg(), Some(-5)); assert_eq!(i32::MIN.checked_neg(), None);
fn checked_shl(self, rhs: u32) -> Option<i64>
1.7.0
Checked shift left. Computes self << rhs
, returning None
if rhs
is larger than or equal to the number of bits in self
.
Examples
Basic usage:
assert_eq!(0x10i32.checked_shl(4), Some(0x100)); assert_eq!(0x10i32.checked_shl(33), None);
fn checked_shr(self, rhs: u32) -> Option<i64>
1.7.0
Checked shift right. Computes self >> rhs
, returning None
if rhs
is larger than or equal to the number of bits in self
.
Examples
Basic usage:
assert_eq!(0x10i32.checked_shr(4), Some(0x1)); assert_eq!(0x10i32.checked_shr(33), None);
fn checked_abs(self) -> Option<i64>
1.13.0
Checked absolute value. Computes self.abs()
, returning None
if
self == MIN
.
Examples
Basic usage:
use std::i32; assert_eq!((-5i32).checked_abs(), Some(5)); assert_eq!(i32::MIN.checked_abs(), None);
fn saturating_add(self, other: i64) -> i64
1.0.0
Saturating integer addition. Computes self + other
, saturating at
the numeric bounds instead of overflowing.
Examples
Basic usage:
assert_eq!(100i8.saturating_add(1), 101); assert_eq!(100i8.saturating_add(127), 127);
fn saturating_sub(self, other: i64) -> i64
1.0.0
Saturating integer subtraction. Computes self - other
, saturating
at the numeric bounds instead of overflowing.
Examples
Basic usage:
assert_eq!(100i8.saturating_sub(127), -27); assert_eq!((-100i8).saturating_sub(127), -128);
fn saturating_mul(self, other: i64) -> i64
1.7.0
Saturating integer multiplication. Computes self * other
,
saturating at the numeric bounds instead of overflowing.
Examples
Basic usage:
use std::i32; assert_eq!(100i32.saturating_mul(127), 12700); assert_eq!((1i32 << 23).saturating_mul(1 << 23), i32::MAX); assert_eq!((-1i32 << 23).saturating_mul(1 << 23), i32::MIN);
fn wrapping_add(self, rhs: i64) -> i64
1.0.0
Wrapping (modular) addition. Computes self + other
,
wrapping around at the boundary of the type.
Examples
Basic usage:
assert_eq!(100i8.wrapping_add(27), 127); assert_eq!(100i8.wrapping_add(127), -29);
fn wrapping_sub(self, rhs: i64) -> i64
1.0.0
Wrapping (modular) subtraction. Computes self - other
,
wrapping around at the boundary of the type.
Examples
Basic usage:
assert_eq!(0i8.wrapping_sub(127), -127); assert_eq!((-2i8).wrapping_sub(127), 127);
fn wrapping_mul(self, rhs: i64) -> i64
1.0.0
Wrapping (modular) multiplication. Computes self * other
, wrapping around at the boundary of the type.
Examples
Basic usage:
assert_eq!(10i8.wrapping_mul(12), 120); assert_eq!(11i8.wrapping_mul(12), -124);
fn wrapping_div(self, rhs: i64) -> i64
1.2.0
Wrapping (modular) division. Computes self / other
,
wrapping around at the boundary of the type.
The only case where such wrapping can occur is when one
divides MIN / -1
on a signed type (where MIN
is the
negative minimal value for the type); this is equivalent
to -MIN
, a positive value that is too large to represent
in the type. In such a case, this function returns MIN
itself.
Panics
This function will panic if rhs
is 0.
Examples
Basic usage:
assert_eq!(100u8.wrapping_div(10), 10); assert_eq!((-128i8).wrapping_div(-1), -128);
fn wrapping_rem(self, rhs: i64) -> i64
1.2.0
Wrapping (modular) remainder. Computes self % other
,
wrapping around at the boundary of the type.
Such wrap-around never actually occurs mathematically;
implementation artifacts make x % y
invalid for MIN / -1
on a signed type (where MIN
is the negative
minimal value). In such a case, this function returns 0
.
Panics
This function will panic if rhs
is 0.
Examples
Basic usage:
assert_eq!(100i8.wrapping_rem(10), 0); assert_eq!((-128i8).wrapping_rem(-1), 0);
fn wrapping_neg(self) -> i64
1.2.0
Wrapping (modular) negation. Computes -self
,
wrapping around at the boundary of the type.
The only case where such wrapping can occur is when one
negates MIN
on a signed type (where MIN
is the
negative minimal value for the type); this is a positive
value that is too large to represent in the type. In such
a case, this function returns MIN
itself.
Examples
Basic usage:
assert_eq!(100i8.wrapping_neg(), -100); assert_eq!((-128i8).wrapping_neg(), -128);
fn wrapping_shl(self, rhs: u32) -> i64
1.2.0
Panic-free bitwise shift-left; yields self << mask(rhs)
,
where mask
removes any high-order bits of rhs
that
would cause the shift to exceed the bitwidth of the type.
Note that this is not the same as a rotate-left; the
RHS of a wrapping shift-left is restricted to the range
of the type, rather than the bits shifted out of the LHS
being returned to the other end. The primitive integer
types all implement a rotate_left
function, which may
be what you want instead.
Examples
Basic usage:
assert_eq!((-1i8).wrapping_shl(7), -128); assert_eq!((-1i8).wrapping_shl(8), -1);
fn wrapping_shr(self, rhs: u32) -> i64
1.2.0
Panic-free bitwise shift-right; yields self >> mask(rhs)
,
where mask
removes any high-order bits of rhs
that
would cause the shift to exceed the bitwidth of the type.
Note that this is not the same as a rotate-right; the
RHS of a wrapping shift-right is restricted to the range
of the type, rather than the bits shifted out of the LHS
being returned to the other end. The primitive integer
types all implement a rotate_right
function, which may
be what you want instead.
Examples
Basic usage:
assert_eq!((-128i8).wrapping_shr(7), -1); assert_eq!((-128i8).wrapping_shr(8), -128);
fn wrapping_abs(self) -> i64
1.13.0
Wrapping (modular) absolute value. Computes self.abs()
,
wrapping around at the boundary of the type.
The only case where such wrapping can occur is when one takes
the absolute value of the negative minimal value for the type
this is a positive value that is too large to represent in the
type. In such a case, this function returns MIN
itself.
Examples
Basic usage:
assert_eq!(100i8.wrapping_abs(), 100); assert_eq!((-100i8).wrapping_abs(), 100); assert_eq!((-128i8).wrapping_abs(), -128); assert_eq!((-128i8).wrapping_abs() as u8, 128);
fn overflowing_add(self, rhs: i64) -> (i64, bool)
1.7.0
Calculates self
+ rhs
Returns a tuple of the addition along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.
Examples
Basic usage
use std::i32; assert_eq!(5i32.overflowing_add(2), (7, false)); assert_eq!(i32::MAX.overflowing_add(1), (i32::MIN, true));
fn overflowing_sub(self, rhs: i64) -> (i64, bool)
1.7.0
Calculates self
- rhs
Returns a tuple of the subtraction along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.
Examples
Basic usage
use std::i32; assert_eq!(5i32.overflowing_sub(2), (3, false)); assert_eq!(i32::MIN.overflowing_sub(1), (i32::MAX, true));
fn overflowing_mul(self, rhs: i64) -> (i64, bool)
1.7.0
Calculates the multiplication of self
and rhs
.
Returns a tuple of the multiplication along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.
Examples
Basic usage
assert_eq!(5i32.overflowing_mul(2), (10, false)); assert_eq!(1_000_000_000i32.overflowing_mul(10), (1410065408, true));
fn overflowing_div(self, rhs: i64) -> (i64, bool)
1.7.0
Calculates the divisor when self
is divided by rhs
.
Returns a tuple of the divisor along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would occur then self is returned.
Panics
This function will panic if rhs
is 0.
Examples
Basic usage
use std::i32; assert_eq!(5i32.overflowing_div(2), (2, false)); assert_eq!(i32::MIN.overflowing_div(-1), (i32::MIN, true));
fn overflowing_rem(self, rhs: i64) -> (i64, bool)
1.7.0
Calculates the remainder when self
is divided by rhs
.
Returns a tuple of the remainder after dividing along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would occur then 0 is returned.
Panics
This function will panic if rhs
is 0.
Examples
Basic usage
use std::i32; assert_eq!(5i32.overflowing_rem(2), (1, false)); assert_eq!(i32::MIN.overflowing_rem(-1), (0, true));
fn overflowing_neg(self) -> (i64, bool)
1.7.0
Negates self, overflowing if this is equal to the minimum value.
Returns a tuple of the negated version of self along with a boolean
indicating whether an overflow happened. If self
is the minimum
value (e.g. i32::MIN
for values of type i32
), then the minimum
value will be returned again and true
will be returned for an
overflow happening.
Examples
Basic usage
use std::i32; assert_eq!(2i32.overflowing_neg(), (-2, false)); assert_eq!(i32::MIN.overflowing_neg(), (i32::MIN, true));
fn overflowing_shl(self, rhs: u32) -> (i64, bool)
1.7.0
Shifts self left by rhs
bits.
Returns a tuple of the shifted version of self along with a boolean indicating whether the shift value was larger than or equal to the number of bits. If the shift value is too large, then value is masked (N-1) where N is the number of bits, and this value is then used to perform the shift.
Examples
Basic usage
assert_eq!(0x10i32.overflowing_shl(4), (0x100, false)); assert_eq!(0x10i32.overflowing_shl(36), (0x100, true));
fn overflowing_shr(self, rhs: u32) -> (i64, bool)
1.7.0
Shifts self right by rhs
bits.
Returns a tuple of the shifted version of self along with a boolean indicating whether the shift value was larger than or equal to the number of bits. If the shift value is too large, then value is masked (N-1) where N is the number of bits, and this value is then used to perform the shift.
Examples
Basic usage
assert_eq!(0x10i32.overflowing_shr(4), (0x1, false)); assert_eq!(0x10i32.overflowing_shr(36), (0x1, true));
fn overflowing_abs(self) -> (i64, bool)
1.13.0
Computes the absolute value of self
.
Returns a tuple of the absolute version of self along with a boolean indicating whether an overflow happened. If self is the minimum value (e.g. i32::MIN for values of type i32), then the minimum value will be returned again and true will be returned for an overflow happening.
Examples
Basic usage:
assert_eq!(10i8.overflowing_abs(), (10,false)); assert_eq!((-10i8).overflowing_abs(), (10,false)); assert_eq!((-128i8).overflowing_abs(), (-128,true));
fn pow(self, exp: u32) -> i64
1.0.0
Raises self to the power of exp
, using exponentiation by squaring.
Examples
Basic usage:
let x: i32 = 2; // or any other integer type assert_eq!(x.pow(4), 16);
fn abs(self) -> i64
1.0.0
Computes the absolute value of self
.
Overflow behavior
The absolute value of i32::min_value()
cannot be represented as an
i32
, and attempting to calculate it will cause an overflow. This
means that code in debug mode will trigger a panic on this case and
optimized code will return i32::min_value()
without a panic.
Examples
Basic usage:
assert_eq!(10i8.abs(), 10); assert_eq!((-10i8).abs(), 10);
fn signum(self) -> i64
1.0.0
Returns a number representing sign of self
.
0
if the number is zero1
if the number is positive-1
if the number is negative
Examples
Basic usage:
assert_eq!(10i8.signum(), 1); assert_eq!(0i8.signum(), 0); assert_eq!((-10i8).signum(), -1);
fn is_positive(self) -> bool
1.0.0
Returns true
if self
is positive and false
if the number
is zero or negative.
Examples
Basic usage:
assert!(10i8.is_positive()); assert!(!(-10i8).is_positive());
fn is_negative(self) -> bool
1.0.0
Returns true
if self
is negative and false
if the number
is zero or positive.
Examples
Basic usage:
assert!((-10i8).is_negative()); assert!(!10i8.is_negative());
Trait Implementations
impl Copy for MilliBel
[src]
impl Clone for MilliBel
[src]
fn clone(&self) -> MilliBel
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0
Performs copy-assignment from source
. Read more
impl Debug for MilliBel
[src]
impl PartialEq for MilliBel
[src]
fn eq(&self, __arg_0: &MilliBel) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &MilliBel) -> bool
This method tests for !=
.
impl Eq for MilliBel
[src]
impl PartialOrd for MilliBel
[src]
fn partial_cmp(&self, __arg_0: &MilliBel) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, __arg_0: &MilliBel) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
fn le(&self, __arg_0: &MilliBel) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
fn gt(&self, __arg_0: &MilliBel) -> bool
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, __arg_0: &MilliBel) -> bool
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl Ord for MilliBel
[src]
fn cmp(&self, __arg_0: &MilliBel) -> Ordering
This method returns an Ordering
between self
and other
. Read more
fn max(self, other: Self) -> Self
ord_max_min
)Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
ord_max_min
)Compares and returns the minimum of two values. Read more
impl Hash for MilliBel
[src]
fn hash<__H: Hasher>(&self, __arg_0: &mut __H)
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl Deref for MilliBel
[src]
type Target = i64
The resulting type after dereferencing
fn deref(&self) -> &i64
The method called to dereference a value
impl Add for MilliBel
[src]
type Output = MilliBel
The resulting type after applying the +
operator
fn add(self, rhs: Self) -> Self
The method for the +
operator