Struct solana_cli_config::CONFIG_FILE [−][src]
pub struct CONFIG_FILE { /* fields omitted */ }
Methods from Deref<Target = Option<String>>
#[must_use = "if you intended to assert that this has a value, consider `.unwrap()` instead"]pub const fn is_some(&self) -> bool
1.0.0 (const: 1.48.0)[src]
#[must_use = "if you intended to assert that this has a value, consider `.unwrap()` instead"]pub const fn is_some(&self) -> bool
1.0.0 (const: 1.48.0)[src]#[must_use = "if you intended to assert that this doesn't have a value, consider \ `.and_then(|| panic!(\"`Option` had a value when expected `None`\"))` instead"]pub const fn is_none(&self) -> bool
1.0.0 (const: 1.48.0)[src]
#[must_use = "if you intended to assert that this doesn't have a value, consider \ `.and_then(|| panic!(\"`Option` had a value when expected `None`\"))` instead"]pub const fn is_none(&self) -> bool
1.0.0 (const: 1.48.0)[src]#[must_use]pub fn contains<U>(&self, x: &U) -> bool where
U: PartialEq<T>,
[src]
🔬 This is a nightly-only experimental API. (option_result_contains
)
#[must_use]pub fn contains<U>(&self, x: &U) -> bool where
U: PartialEq<T>,
[src]🔬 This is a nightly-only experimental API. (
option_result_contains
)Returns true
if the option is a Some
value containing the given value.
Examples
#![feature(option_result_contains)] let x: Option<u32> = Some(2); assert_eq!(x.contains(&2), true); let x: Option<u32> = Some(3); assert_eq!(x.contains(&2), false); let x: Option<u32> = None; assert_eq!(x.contains(&2), false);
pub const fn as_ref(&self) -> Option<&T>
1.0.0 (const: 1.48.0)[src]
pub const fn as_ref(&self) -> Option<&T>
1.0.0 (const: 1.48.0)[src]Converts from &Option<T>
to Option<&T>
.
Examples
Converts an Option<
String
>
into an Option<
usize
>
, preserving the original.
The map
method takes the self
argument by value, consuming the original,
so this technique uses as_ref
to first take an Option
to a reference
to the value inside the original.
let text: Option<String> = Some("Hello, world!".to_string()); // First, cast `Option<String>` to `Option<&String>` with `as_ref`, // then consume *that* with `map`, leaving `text` on the stack. let text_length: Option<usize> = text.as_ref().map(|s| s.len()); println!("still can print text: {:?}", text);
pub fn as_deref(&self) -> Option<&<T as Deref>::Target>
1.40.0[src]
pub fn as_deref(&self) -> Option<&<T as Deref>::Target>
1.40.0[src]Converts from Option<T>
(or &Option<T>
) to Option<&T::Target>
.
Leaves the original Option in-place, creating a new one with a reference
to the original one, additionally coercing the contents via Deref
.
Examples
let x: Option<String> = Some("hey".to_owned()); assert_eq!(x.as_deref(), Some("hey")); let x: Option<String> = None; assert_eq!(x.as_deref(), None);
Trait Implementations
impl Deref for CONFIG_FILE
[src]
impl Deref for CONFIG_FILE
[src]impl LazyStatic for CONFIG_FILE
[src]
impl LazyStatic for CONFIG_FILE
[src]