Primitive Type bool1.0.0[−]
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 BitOrAssign<bool> for bool1.8.0[src]
impl BitOrAssign<bool> for boolfn bitor_assign(&mut self, other: bool)[src]
fn bitor_assign(&mut self, other: bool)Performs the |= operation.
impl<'a> BitOrAssign<&'a bool> for bool1.22.0[src]
impl<'a> BitOrAssign<&'a bool> for boolfn bitor_assign(&mut self, other: &'a bool)[src]
fn bitor_assign(&mut self, other: &'a bool)Performs the |= operation.
impl<'a> BitAndAssign<&'a bool> for bool1.22.0[src]
impl<'a> BitAndAssign<&'a bool> for boolfn bitand_assign(&mut self, other: &'a bool)[src]
fn bitand_assign(&mut self, other: &'a bool)Performs the &= operation.
impl BitAndAssign<bool> for bool1.8.0[src]
impl BitAndAssign<bool> for boolfn bitand_assign(&mut self, other: bool)[src]
fn bitand_assign(&mut self, other: bool)Performs the &= operation.
impl Hash for bool[src]
impl Hash for boolfn hash<H>(&self, state: &mut H) where
H: Hasher, [src]
fn hash<H>(&self, state: &mut H) where
H: Hasher, Feeds this value into the given [Hasher]. Read more
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<'a, 'b> BitOr<&'a bool> for &'b bool[src]
impl<'a, 'b> BitOr<&'a bool> for &'b booltype Output = <bool as BitOr<bool>>::Output
The resulting type after applying the | operator.
fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::Output[src]
fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::OutputPerforms the | operation.
impl<'a> BitOr<bool> for &'a bool[src]
impl<'a> BitOr<bool> for &'a booltype Output = <bool as BitOr<bool>>::Output
The resulting type after applying the | operator.
fn bitor(self, other: bool) -> <bool as BitOr<bool>>::Output[src]
fn bitor(self, other: bool) -> <bool as BitOr<bool>>::OutputPerforms the | operation.
impl<'a> BitOr<&'a bool> for bool[src]
impl<'a> BitOr<&'a bool> for booltype Output = <bool as BitOr<bool>>::Output
The resulting type after applying the | operator.
fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::Output[src]
fn bitor(self, other: &'a bool) -> <bool as BitOr<bool>>::OutputPerforms the | operation.
impl BitOr<bool> for bool[src]
impl BitOr<bool> for booltype Output = bool
The resulting type after applying the | operator.
fn bitor(self, rhs: bool) -> bool[src]
fn bitor(self, rhs: bool) -> boolPerforms the | operation.
impl Clone for bool[src]
impl Clone for boolfn clone(&self) -> bool[src]
fn clone(&self) -> boolReturns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)[src]
fn clone_from(&mut self, source: &Self)Performs copy-assignment from source. Read more
impl Debug for bool[src]
impl Debug for boolfn fmt(&self, f: &mut Formatter) -> Result<(), Error>[src]
fn fmt(&self, f: &mut Formatter) -> Result<(), Error>Formats the value using the given formatter. Read more
impl PartialOrd<bool> for bool[src]
impl PartialOrd<bool> for boolfn partial_cmp(&self, other: &bool) -> Option<Ordering>[src]
fn partial_cmp(&self, other: &bool) -> Option<Ordering>This method returns an ordering between self and other values if one exists. Read more
#[must_use]
fn lt(&self, other: &Rhs) -> bool[src]
#[must_use]
fn lt(&self, other: &Rhs) -> boolThis method tests less than (for self and other) and is used by the < operator. Read more
#[must_use]
fn le(&self, other: &Rhs) -> bool[src]
#[must_use]
fn le(&self, other: &Rhs) -> boolThis 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[src]
#[must_use]
fn gt(&self, other: &Rhs) -> boolThis method tests greater than (for self and other) and is used by the > operator. Read more
#[must_use]
fn ge(&self, other: &Rhs) -> bool[src]
#[must_use]
fn ge(&self, other: &Rhs) -> boolThis method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl Ord for bool[src]
impl Ord for boolfn cmp(&self, other: &bool) -> Ordering[src]
fn cmp(&self, other: &bool) -> OrderingThis method returns an Ordering between self and other. Read more
fn max(self, other: Self) -> Self1.21.0[src]
fn max(self, other: Self) -> SelfCompares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self1.21.0[src]
fn min(self, other: Self) -> SelfCompares and returns the minimum of two values. Read more
impl FromStr for bool[src]
impl FromStr for booltype Err = ParseBoolError
The associated error which can be returned from parsing.
fn from_str(s: &str) -> Result<bool, ParseBoolError>[src]
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<'a> BitXor<bool> for &'a bool[src]
impl<'a> BitXor<bool> for &'a booltype Output = <bool as BitXor<bool>>::Output
The resulting type after applying the ^ operator.
fn bitxor(self, other: bool) -> <bool as BitXor<bool>>::Output[src]
fn bitxor(self, other: bool) -> <bool as BitXor<bool>>::OutputPerforms the ^ operation.
impl<'a, 'b> BitXor<&'a bool> for &'b bool[src]
impl<'a, 'b> BitXor<&'a bool> for &'b booltype Output = <bool as BitXor<bool>>::Output
The resulting type after applying the ^ operator.
fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::Output[src]
fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::OutputPerforms the ^ operation.
impl BitXor<bool> for bool[src]
impl BitXor<bool> for booltype Output = bool
The resulting type after applying the ^ operator.
fn bitxor(self, other: bool) -> bool[src]
fn bitxor(self, other: bool) -> boolPerforms the ^ operation.
impl<'a> BitXor<&'a bool> for bool[src]
impl<'a> BitXor<&'a bool> for booltype Output = <bool as BitXor<bool>>::Output
The resulting type after applying the ^ operator.
fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::Output[src]
fn bitxor(self, other: &'a bool) -> <bool as BitXor<bool>>::OutputPerforms the ^ operation.
impl Eq for bool[src]
impl Eq for boolimpl PartialEq<bool> for bool[src]
impl PartialEq<bool> for boolfn eq(&self, other: &bool) -> bool[src]
fn eq(&self, other: &bool) -> boolThis method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &bool) -> bool[src]
fn ne(&self, other: &bool) -> boolThis method tests for !=.
impl<'a> Not for &'a bool[src]
impl<'a> Not for &'a booltype Output = <bool as Not>::Output
The resulting type after applying the ! operator.
fn not(self) -> <bool as Not>::Output[src]
fn not(self) -> <bool as Not>::OutputPerforms the unary ! operation.
impl Not for bool[src]
impl Not for booltype Output = bool
The resulting type after applying the ! operator.
fn not(self) -> bool[src]
fn not(self) -> boolPerforms the unary ! operation.
impl Copy for bool[src]
impl Copy for boolimpl<'a, 'b> BitAnd<&'a bool> for &'b bool[src]
impl<'a, 'b> BitAnd<&'a bool> for &'b booltype Output = <bool as BitAnd<bool>>::Output
The resulting type after applying the & operator.
fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::Output[src]
fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::OutputPerforms the & operation.
impl<'a> BitAnd<&'a bool> for bool[src]
impl<'a> BitAnd<&'a bool> for booltype Output = <bool as BitAnd<bool>>::Output
The resulting type after applying the & operator.
fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::Output[src]
fn bitand(self, other: &'a bool) -> <bool as BitAnd<bool>>::OutputPerforms the & operation.
impl<'a> BitAnd<bool> for &'a bool[src]
impl<'a> BitAnd<bool> for &'a booltype Output = <bool as BitAnd<bool>>::Output
The resulting type after applying the & operator.
fn bitand(self, other: bool) -> <bool as BitAnd<bool>>::Output[src]
fn bitand(self, other: bool) -> <bool as BitAnd<bool>>::OutputPerforms the & operation.
impl BitAnd<bool> for bool[src]
impl BitAnd<bool> for booltype Output = bool
The resulting type after applying the & operator.
fn bitand(self, rhs: bool) -> bool[src]
fn bitand(self, rhs: bool) -> boolPerforms the & operation.
impl Default for bool[src]
impl Default for boolimpl Display for bool[src]
impl Display for boolfn fmt(&self, f: &mut Formatter) -> Result<(), Error>[src]
fn fmt(&self, f: &mut Formatter) -> Result<(), Error>Formats the value using the given formatter. Read more
impl<'a> BitXorAssign<&'a bool> for bool1.22.0[src]
impl<'a> BitXorAssign<&'a bool> for boolfn bitxor_assign(&mut self, other: &'a bool)[src]
fn bitxor_assign(&mut self, other: &'a bool)Performs the ^= operation.
impl BitXorAssign<bool> for bool1.8.0[src]
impl BitXorAssign<bool> for boolfn bitxor_assign(&mut self, other: bool)[src]
fn bitxor_assign(&mut self, other: bool)Performs the ^= operation.