#[must_use = "must eventually call `finish()` on Debug builders"]
pub struct DebugMap<'a, 'b> where
'b: 'a,
'b: 'a,
'b: 'b, { /* fields omitted */ }
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.
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()
}
}
println!("{:?}", Foo(vec![("A".to_string(), 10), ("B".to_string(), 11)]));
pub fn entry( &mut self, key: &dyn Debug, value: &dyn Debug ) -> &mut DebugMap<'a, 'b> | [src] |
Adds a new entry to the map output.
Adds the contents of an iterator of entries to the map output.
Finishes output and returns any error encountered.
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static