1.0.0[−][src]Trait std::any::Any
A trait to emulate dynamic typing.
Most types implement Any. However, any type which contains a non-'static reference does not.
See the module-level documentation for more details.
Required methods
Loading content...Methods
impl dyn Any + 'static[src]
pub fn is<T>(&self) -> bool where
T: Any, [src]
T: Any,
Returns true if the boxed type is the same as T.
Examples
use std::any::Any; fn is_string(s: &dyn Any) { if s.is::<String>() { println!("It's a string!"); } else { println!("Not a string..."); } } is_string(&0); is_string(&"cookie monster".to_string());Run
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: Any, [src]
T: Any,
Returns some reference to the boxed value if it is of type T, or
None if it isn't.
Examples
use std::any::Any; fn print_if_string(s: &dyn Any) { if let Some(string) = s.downcast_ref::<String>() { println!("It's a string({}): '{}'", string.len(), string); } else { println!("Not a string..."); } } print_if_string(&0); print_if_string(&"cookie monster".to_string());Run
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: Any, [src]
T: Any,
Returns some mutable reference to the boxed value if it is of type T, or
None if it isn't.
Examples
use std::any::Any; fn modify_if_u32(s: &mut dyn Any) { if let Some(num) = s.downcast_mut::<u32>() { *num = 42; } } let mut x = 10u32; let mut s = "starlord".to_string(); modify_if_u32(&mut x); modify_if_u32(&mut s); assert_eq!(x, 42); assert_eq!(&s, "starlord");Run
impl dyn Any + 'static + Send[src]
pub fn is<T>(&self) -> bool where
T: Any, [src]
T: Any,
Forwards to the method defined on the type Any.
Examples
use std::any::Any; fn is_string(s: &(dyn Any + Send)) { if s.is::<String>() { println!("It's a string!"); } else { println!("Not a string..."); } } is_string(&0); is_string(&"cookie monster".to_string());Run
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: Any, [src]
T: Any,
Forwards to the method defined on the type Any.
Examples
use std::any::Any; fn print_if_string(s: &(dyn Any + Send)) { if let Some(string) = s.downcast_ref::<String>() { println!("It's a string({}): '{}'", string.len(), string); } else { println!("Not a string..."); } } print_if_string(&0); print_if_string(&"cookie monster".to_string());Run
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: Any, [src]
T: Any,
Forwards to the method defined on the type Any.
Examples
use std::any::Any; fn modify_if_u32(s: &mut (dyn Any + Send)) { if let Some(num) = s.downcast_mut::<u32>() { *num = 42; } } let mut x = 10u32; let mut s = "starlord".to_string(); modify_if_u32(&mut x); modify_if_u32(&mut s); assert_eq!(x, 42); assert_eq!(&s, "starlord");Run
impl dyn Any + 'static + Sync + Send[src]
pub fn is<T>(&self) -> bool where
T: Any, 1.28.0[src]
T: Any,
Forwards to the method defined on the type Any.
Examples
use std::any::Any; fn is_string(s: &(dyn Any + Send + Sync)) { if s.is::<String>() { println!("It's a string!"); } else { println!("Not a string..."); } } is_string(&0); is_string(&"cookie monster".to_string());Run
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: Any, 1.28.0[src]
T: Any,
Forwards to the method defined on the type Any.
Examples
use std::any::Any; fn print_if_string(s: &(dyn Any + Send + Sync)) { if let Some(string) = s.downcast_ref::<String>() { println!("It's a string({}): '{}'", string.len(), string); } else { println!("Not a string..."); } } print_if_string(&0); print_if_string(&"cookie monster".to_string());Run
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: Any, 1.28.0[src]
T: Any,
Forwards to the method defined on the type Any.
Examples
use std::any::Any; fn modify_if_u32(s: &mut (dyn Any + Send + Sync)) { if let Some(num) = s.downcast_mut::<u32>() { *num = 42; } } let mut x = 10u32; let mut s = "starlord".to_string(); modify_if_u32(&mut x); modify_if_u32(&mut s); assert_eq!(x, 42); assert_eq!(&s, "starlord");Run