Enum Check 

pub enum Check {
    Pass,
    Fail(String),
}

The outcome of a requirement or an answer.

Feedback for the player is data, never an error: a wrong answer is the normal case of this program, not an exceptional one. Fail carries the exact text to show.

Variants

Pass

The work is correct.

Fail(String)

The work is not correct; the text is what the player sees.

Implementations

impl Check

pub fn fail(message: impl Into<String>) -> Self

A failure with the given player-facing message.

pub fn is_pass(&self) -> bool

True for Check::Pass.

pub fn is_fail(&self) -> bool

True for Check::Fail.

pub fn message(&self) -> Option<&str>

The failure message, if this is a failure.

pub fn and_then(self, next: impl FnOnce() -> Check) -> Check

Run next only when this check passed; otherwise keep this failure.

Trait Implementations

impl Clone for Check

fn clone(&self) -> Check

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Check

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Check

impl PartialEq for Check

fn eq(&self, other: &Check) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Check