pub struct DebugMap<'a, 'b>where
'b: 'a,{ /* private fields */ }Expand description
A struct to help with fmt::Debug implementations.
This is useful when you wish to output a formatted map as a part of your
Debug::fmt implementation.
This can be constructed by the Formatter::debug_map method.
§Examples
use std::fmt;
struct Foo(Vec<(String, i32)>);
impl fmt::Debug for Foo {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_map().entries(self.0.iter().map(|&(ref k, ref v)| (k, v))).finish()
}
}
assert_eq!(
format!("{:?}", Foo(vec![("A".to_string(), 10), ("B".to_string(), 11)])),
r#"{"A": 10, "B": 11}"#,
);