Struct scale_info::prelude::num::NonZeroU16

1.28.0 · source ·
pub struct NonZeroU16(_);
Expand description

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroU16> is the same size as u16:

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroU16>>(), size_of::<u16>());

Implementations§

Creates a non-zero without checking whether the value is non-zero. This results in undefined behaviour if the value is zero.

Safety

The value must not be zero.

Creates a non-zero if the given value is not zero.

Returns the value as a primitive type.

Returns the number of leading zeros in the binary representation of self.

On many architectures, this function can perform better than leading_zeros() on the underlying integer type, as special handling of zero can be avoided.

Examples

Basic usage:

let n = std::num::NonZeroU16::new(u16::MAX).unwrap();

assert_eq!(n.leading_zeros(), 0);

Returns the number of trailing zeros in the binary representation of self.

On many architectures, this function can perform better than trailing_zeros() on the underlying integer type, as special handling of zero can be avoided.

Examples

Basic usage:

let n = std::num::NonZeroU16::new(0b0101000).unwrap();

assert_eq!(n.trailing_zeros(), 3);

Adds an unsigned integer to a non-zero value. Checks for overflow and returns None on overflow. As a consequence, the result cannot wrap to zero.

Examples
let one = NonZeroU16::new(1)?;
let two = NonZeroU16::new(2)?;
let max = NonZeroU16::new(u16::MAX)?;

assert_eq!(Some(two), one.checked_add(1));
assert_eq!(None, max.checked_add(1));

Adds an unsigned integer to a non-zero value. Return u16::MAX on overflow.

Examples
let one = NonZeroU16::new(1)?;
let two = NonZeroU16::new(2)?;
let max = NonZeroU16::new(u16::MAX)?;

assert_eq!(two, one.saturating_add(1));
assert_eq!(max, max.saturating_add(1));
🔬This is a nightly-only experimental API. (nonzero_ops)

Adds an unsigned integer to a non-zero value, assuming overflow cannot occur. Overflow is unchecked, and it is undefined behaviour to overflow even if the result would wrap to a non-zero value. The behaviour is undefined as soon as self + rhs > u16::MAX.

Examples
#![feature(nonzero_ops)]

let one = NonZeroU16::new(1)?;
let two = NonZeroU16::new(2)?;

assert_eq!(two, unsafe { one.unchecked_add(1) });

Returns the smallest power of two greater than or equal to n. Checks for overflow and returns None if the next power of two is greater than the type’s maximum value. As a consequence, the result cannot wrap to zero.

Examples
let two = NonZeroU16::new(2)?;
let three = NonZeroU16::new(3)?;
let four = NonZeroU16::new(4)?;
let max = NonZeroU16::new(u16::MAX)?;

assert_eq!(Some(two), two.checked_next_power_of_two() );
assert_eq!(Some(four), three.checked_next_power_of_two() );
assert_eq!(None, max.checked_next_power_of_two() );

Returns the base 2 logarithm of the number, rounded down.

This is the same operation as u16::ilog2, except that it has no failure cases to worry about since this value can never be zero.

Examples
assert_eq!(NonZeroU16::new(7).unwrap().ilog2(), 2);
assert_eq!(NonZeroU16::new(8).unwrap().ilog2(), 3);
assert_eq!(NonZeroU16::new(9).unwrap().ilog2(), 3);

Returns the base 10 logarithm of the number, rounded down.

This is the same operation as u16::ilog10, except that it has no failure cases to worry about since this value can never be zero.

Examples
assert_eq!(NonZeroU16::new(99).unwrap().ilog10(), 1);
assert_eq!(NonZeroU16::new(100).unwrap().ilog10(), 2);
assert_eq!(NonZeroU16::new(101).unwrap().ilog10(), 2);

Multiplies two non-zero integers together. Checks for overflow and returns None on overflow. As a consequence, the result cannot wrap to zero.

Examples
let two = NonZeroU16::new(2)?;
let four = NonZeroU16::new(4)?;
let max = NonZeroU16::new(u16::MAX)?;

assert_eq!(Some(four), two.checked_mul(two));
assert_eq!(None, max.checked_mul(two));

Multiplies two non-zero integers together. Return u16::MAX on overflow.

Examples
let two = NonZeroU16::new(2)?;
let four = NonZeroU16::new(4)?;
let max = NonZeroU16::new(u16::MAX)?;

assert_eq!(four, two.saturating_mul(two));
assert_eq!(max, four.saturating_mul(max));
🔬This is a nightly-only experimental API. (nonzero_ops)

Multiplies two non-zero integers together, assuming overflow cannot occur. Overflow is unchecked, and it is undefined behaviour to overflow even if the result would wrap to a non-zero value. The behaviour is undefined as soon as self * rhs > u16::MAX.

Examples
#![feature(nonzero_ops)]

let two = NonZeroU16::new(2)?;
let four = NonZeroU16::new(4)?;

assert_eq!(four, unsafe { two.unchecked_mul(two) });

Raises non-zero value to an integer power. Checks for overflow and returns None on overflow. As a consequence, the result cannot wrap to zero.

Examples
let three = NonZeroU16::new(3)?;
let twenty_seven = NonZeroU16::new(27)?;
let half_max = NonZeroU16::new(u16::MAX / 2)?;

assert_eq!(Some(twenty_seven), three.checked_pow(3));
assert_eq!(None, half_max.checked_pow(3));

Raise non-zero value to an integer power. Return u16::MAX on overflow.

Examples
let three = NonZeroU16::new(3)?;
let twenty_seven = NonZeroU16::new(27)?;
let max = NonZeroU16::new(u16::MAX)?;

assert_eq!(twenty_seven, three.saturating_pow(3));
assert_eq!(max, max.saturating_pow(3));

Returns true if and only if self == (1 << k) for some k.

On many architectures, this function can perform better than is_power_of_two() on the underlying integer type, as special handling of zero can be avoided.

Examples

Basic usage:

let eight = std::num::NonZeroU16::new(8).unwrap();
assert!(eight.is_power_of_two());
let ten = std::num::NonZeroU16::new(10).unwrap();
assert!(!ten.is_power_of_two());
🔬This is a nightly-only experimental API. (nonzero_min_max)

The smallest value that can be represented by this non-zero integer type, 1.

Examples
#![feature(nonzero_min_max)]

assert_eq!(NonZeroU16::MIN.get(), 1u16);
🔬This is a nightly-only experimental API. (nonzero_min_max)

The largest value that can be represented by this non-zero integer type, equal to u16::MAX.

Examples
#![feature(nonzero_min_max)]

assert_eq!(NonZeroU16::MAX.get(), u16::MAX);
🔬This is a nightly-only experimental API. (nonzero_bits)

The size of this non-zero integer type in bits.

This value is equal to u16::BITS.

Examples
#![feature(nonzero_bits)]

assert_eq!(NonZeroU16::BITS, u16::BITS);

Trait Implementations§

Formats the value using the given formatter.
The resulting type after applying the | operator.
Performs the | operation. Read more
The resulting type after applying the | operator.
Performs the | operation. Read more
The resulting type after applying the | operator.
Performs the | operation. Read more
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Returns a copy of the value. Read more
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Formats the value using the given formatter. Read more
Attempt to deserialise the value from input.
Attempt to skip the encoded value from input. Read more
Returns the fixed encoded size of the type. Read more
Deserialize this value from the given Serde deserializer. Read more
Formats the value using the given formatter. Read more

This operation rounds towards zero, truncating any fractional part of the exact result, and cannot panic.

The resulting type after applying the / operator.
If possible give a hint of expected size of the encoding. Read more
Convert self to a slice and append it to the destination.
Convert self to an owned vector.
Convert self to a slice and then invoke the given closure with it.
Calculates the encoded size. Read more

Converts NonZeroU16 to NonZeroI128 losslessly.

Converts NonZeroU16 to NonZeroI32 losslessly.

Converts NonZeroU16 to NonZeroI64 losslessly.

Converts NonZeroU16 to NonZeroU128 losslessly.

Converts NonZeroU16 to NonZeroU32 losslessly.

Converts NonZeroU16 to NonZeroU64 losslessly.

Converts NonZeroU16 to NonZeroUsize losslessly.

Converts NonZeroU8 to NonZeroU16 losslessly.

The associated error which can be returned from parsing.
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Feeds this value into the given Hasher. Read more
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Upper bound, in bytes, of the maximum encoded size of this item.
Formats the value using the given formatter.
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

This operation satisfies n % d == n - (n / d) * d, and cannot panic.

The resulting type after applying the % operator.
Serialize this value into the given Serde serializer. Read more

Attempts to convert NonZeroI128 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroI16 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroI32 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroI64 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroI8 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroIsize to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroU128 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroU16 to NonZeroI16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroU16 to NonZeroI8.

The type returned in the event of a conversion error.

Attempts to convert NonZeroU16 to NonZeroIsize.

The type returned in the event of a conversion error.

Attempts to convert NonZeroU16 to NonZeroU8.

The type returned in the event of a conversion error.

Attempts to convert NonZeroU32 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroU64 to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert NonZeroUsize to NonZeroU16.

The type returned in the event of a conversion error.

Attempts to convert u16 to NonZeroU16.

The type returned in the event of a conversion error.
The type identifying for which type info is provided. Read more
Returns the static type identifier for Self.
Formats the value using the given formatter.

Auto Trait Implementations§

Blanket Implementations§

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Decode Self and consume all of the given input data. Read more
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Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Return an encoding of Self prepended by given slice.
Pipes by value. This is generally the method you want to use. Read more
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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.