Trait ToTrue 

pub trait ToTrue: Sized {
    // Required methods
    fn to_true<F, R>(&mut self, f: F) -> Option<R>
       where F: FnOnce() -> R;
    fn to_false<F, R>(&mut self, f: F) -> Option<R>
       where F: FnOnce() -> R;
}

Convenient conversion of bool states

Examples

let mut state = false;
let mut n = 0;

assert_eq!(state.to_true(|| n += 1), Some(()));
assert_eq!((n, state), (1, true));

assert_eq!(state.to_true(|| n += 1), None);
assert_eq!((n, state), (1, true));

assert_eq!(state.to_false(|| n += 1), Some(()));
assert_eq!((n, state), (2, false));

assert_eq!(state.to_false(|| n += 1), None);
assert_eq!((n, state), (2, false));

Required Methods

fn to_true<F, R>(&mut self, f: F) -> Option<R>

where F: FnOnce() -> R,

Run f when *self == false, then assign *self to true

fn to_false<F, R>(&mut self, f: F) -> Option<R>

where F: FnOnce() -> R,

Run f when *self == true, then assign *self to false

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl ToTrue for bool

fn to_true<F, R>(&mut self, f: F) -> Option<R>

where F: FnOnce() -> R,

fn to_false<F, R>(&mut self, f: F) -> Option<R>

where F: FnOnce() -> R,

Implementors