1.0.0[−]Primitive Type bool
The boolean type.
The bool
represents a value, which could only be either true
or false
. If you cast
a bool
into an integer, true
will be 1 and false
will be 0.
Basic usage
bool
implements various traits, such as BitAnd
, BitOr
, Not
, etc.,
which allow us to perform boolean operations using &
, |
and !
.
if
always demands a bool
value. assert!
, being an important macro in testing,
checks whether an expression returns true
.
let bool_val = true & false | false; assert!(!bool_val);Run
Examples
A trivial example of the usage of bool
,
let praise_the_borrow_checker = true; // using the `if` conditional if praise_the_borrow_checker { println!("oh, yeah!"); } else { println!("what?!!"); } // ... or, a match pattern match praise_the_borrow_checker { true => println!("keep praising!"), false => println!("you should praise!"), }Run
Also, since bool
implements the Copy
trait, we don't
have to worry about the move semantics (just like the integer and float primitives).
Now an example of bool
cast to integer type:
assert_eq!(true as i32, 1); assert_eq!(false as i32, 0);Run
Trait Implementations
impl Debug for bool
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impl Debug for bool
impl BitAnd<bool> for bool
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impl BitAnd<bool> for bool
type Output = bool
The resulting type after applying the &
operator.
fn bitand(self, rhs: bool) -> bool
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fn bitand(self, rhs: bool) -> bool
impl<'a, 'b> BitAnd<&'a bool> for &'b bool
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impl<'a, 'b> BitAnd<&'a bool> for &'b bool
type Output = <bool as BitAnd<bool>>::Output
The resulting type after applying the &
operator.
fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::Output
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fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::Output
impl<'a> BitAnd<bool> for &'a bool
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impl<'a> BitAnd<bool> for &'a bool
type Output = <bool as BitAnd<bool>>::Output
The resulting type after applying the &
operator.
fn bitand(self, other: bool) -> <bool as BitAnd<bool>>::Output
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fn bitand(self, other: bool) -> <bool as BitAnd<bool>>::Output
impl<'a> BitAnd<&'a bool> for bool
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impl<'a> BitAnd<&'a bool> for bool
type Output = <bool as BitAnd<bool>>::Output
The resulting type after applying the &
operator.
fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::Output
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fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::Output
impl Clone for bool
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impl Clone for bool
fn clone(&self) -> bool
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fn clone(&self) -> bool
fn clone_from(&mut self, source: &Self)
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fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl PartialOrd<bool> for bool
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impl PartialOrd<bool> for bool
fn partial_cmp(&self, other: &bool) -> Option<Ordering>
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fn partial_cmp(&self, other: &bool) -> Option<Ordering>
#[must_use]
fn lt(&self, other: &Rhs) -> bool
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#[must_use]
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
#[must_use]
fn le(&self, other: &Rhs) -> bool
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#[must_use]
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
#[must_use]
fn gt(&self, other: &Rhs) -> bool
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#[must_use]
fn gt(&self, other: &Rhs) -> bool
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
#[must_use]
fn ge(&self, other: &Rhs) -> bool
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#[must_use]
fn ge(&self, other: &Rhs) -> bool
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl<'a> BitXorAssign<&'a bool> for bool
1.22.0[src]
impl<'a> BitXorAssign<&'a bool> for bool
fn bitxor_assign(&mut self, other: &'a bool)
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fn bitxor_assign(&mut self, other: &'a bool)
impl BitXorAssign<bool> for bool
1.8.0[src]
impl BitXorAssign<bool> for bool
fn bitxor_assign(&mut self, other: bool)
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fn bitxor_assign(&mut self, other: bool)
impl Ord for bool
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impl Ord for bool
fn cmp(&self, other: &bool) -> Ordering
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fn cmp(&self, other: &bool) -> Ordering
fn max(self, other: Self) -> Self
1.21.0[src]
fn max(self, other: Self) -> Self
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
1.21.0[src]
fn min(self, other: Self) -> Self
Compares and returns the minimum of two values. Read more
impl BitOrAssign<bool> for bool
1.8.0[src]
impl BitOrAssign<bool> for bool
fn bitor_assign(&mut self, other: bool)
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fn bitor_assign(&mut self, other: bool)
impl<'a> BitOrAssign<&'a bool> for bool
1.22.0[src]
impl<'a> BitOrAssign<&'a bool> for bool
fn bitor_assign(&mut self, other: &'a bool)
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fn bitor_assign(&mut self, other: &'a bool)
impl<'a> BitAndAssign<&'a bool> for bool
1.22.0[src]
impl<'a> BitAndAssign<&'a bool> for bool
fn bitand_assign(&mut self, other: &'a bool)
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fn bitand_assign(&mut self, other: &'a bool)
impl BitAndAssign<bool> for bool
1.8.0[src]
impl BitAndAssign<bool> for bool
fn bitand_assign(&mut self, other: bool)
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fn bitand_assign(&mut self, other: bool)
impl Eq for bool
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impl Eq for bool
impl PartialEq<bool> for bool
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impl PartialEq<bool> for bool
impl<'a> BitOr<bool> for &'a bool
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impl<'a> BitOr<bool> for &'a bool
type Output = <bool as BitOr<bool>>::Output
The resulting type after applying the |
operator.
fn bitor(self, other: bool) -> <bool as BitOr<bool>>::Output
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fn bitor(self, other: bool) -> <bool as BitOr<bool>>::Output
impl BitOr<bool> for bool
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impl BitOr<bool> for bool
type Output = bool
The resulting type after applying the |
operator.
fn bitor(self, rhs: bool) -> bool
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fn bitor(self, rhs: bool) -> bool
impl<'a> BitOr<&'a bool> for bool
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impl<'a> BitOr<&'a bool> for bool
type Output = <bool as BitOr<bool>>::Output
The resulting type after applying the |
operator.
fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::Output
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fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::Output
impl<'a, 'b> BitOr<&'a bool> for &'b bool
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impl<'a, 'b> BitOr<&'a bool> for &'b bool
type Output = <bool as BitOr<bool>>::Output
The resulting type after applying the |
operator.
fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::Output
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fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::Output
impl Display for bool
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impl Display for bool
impl FromStr for bool
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impl FromStr for bool
type Err = ParseBoolError
The associated error which can be returned from parsing.
fn from_str(s: &str) -> Result<bool, ParseBoolError>
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fn from_str(s: &str) -> Result<bool, ParseBoolError>
Parse a bool
from a string.
Yields a Result<bool, ParseBoolError>
, because s
may or may not
actually be parseable.
Examples
use std::str::FromStr; assert_eq!(FromStr::from_str("true"), Ok(true)); assert_eq!(FromStr::from_str("false"), Ok(false)); assert!(<bool as FromStr>::from_str("not even a boolean").is_err());Run
Note, in many cases, the .parse()
method on str
is more proper.
assert_eq!("true".parse(), Ok(true)); assert_eq!("false".parse(), Ok(false)); assert!("not even a boolean".parse::<bool>().is_err());Run
impl Hash for bool
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impl Hash for bool
fn hash<H>(&self, state: &mut H) where
H: Hasher,
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fn hash<H>(&self, state: &mut H) where
H: Hasher,
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl BitXor<bool> for bool
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impl BitXor<bool> for bool
type Output = bool
The resulting type after applying the ^
operator.
fn bitxor(self, other: bool) -> bool
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fn bitxor(self, other: bool) -> bool
impl<'a> BitXor<bool> for &'a bool
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impl<'a> BitXor<bool> for &'a bool
type Output = <bool as BitXor<bool>>::Output
The resulting type after applying the ^
operator.
fn bitxor(self, other: bool) -> <bool as BitXor<bool>>::Output
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fn bitxor(self, other: bool) -> <bool as BitXor<bool>>::Output
impl<'a, 'b> BitXor<&'a bool> for &'b bool
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impl<'a, 'b> BitXor<&'a bool> for &'b bool
type Output = <bool as BitXor<bool>>::Output
The resulting type after applying the ^
operator.
fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::Output
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fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::Output
impl<'a> BitXor<&'a bool> for bool
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impl<'a> BitXor<&'a bool> for bool
type Output = <bool as BitXor<bool>>::Output
The resulting type after applying the ^
operator.
fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::Output
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fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::Output
impl Not for bool
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impl Not for bool
impl<'a> Not for &'a bool
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impl<'a> Not for &'a bool
type Output = <bool as Not>::Output
The resulting type after applying the !
operator.
fn not(self) -> <bool as Not>::Output
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fn not(self) -> <bool as Not>::Output
impl Default for bool
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impl Default for bool
impl Copy for bool
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impl Copy for bool