Enum Outcome 

pub enum Outcome {
    T,
    F,
    N,
}

Possible outcome values when evaluating an Expression against an individual Resource from a collection.

From OGC CQL2:

Each resource instance in the source collection is evaluated against a filtering expression. The net effect of evaluating a filter Expression is a subset of resources that satisfy the predicate(s) in the Expression.

Logically connected predicates are evaluated according to the following truth table, where T is TRUE, F is FALSE and N is NULL.

+-----+-----+---------+---------+
| P1  | P2  | P1 & P2 | P1 | P2 |
+-----+-----+---------+---------+
|  T  |  T  |    T    |    T    |
|  T  |  F  |    F    |    T    |
|  F  |  T  |    F    |    T    |
|  F  |  F  |    F    |    F    |
|  T  |  N  |    N    |    T    |
|  F  |  N  |    F    |    N    |
|  N  |  T  |    N    |    T    |
|  N  |  F  |    F    |    N    |
|  N  |  N  |    N    |    N    |
+-----+-----+---------+---------+

Variants

T

The input satisfies the Expression and should be marked as being in the result set.

F

The input does not satisfy the filter Expression and should not be included the result set.

N

Likewise.

Implementations

impl Outcome

pub fn new(flag: Option<&bool>) -> Self

Constructor from an optional boolean.

Trait Implementations

impl Debug for Outcome

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

Formats the value using the given formatter.

impl Display for Outcome

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

Formats the value using the given formatter.

impl PartialEq for Outcome

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Outcome

impl StructuralPartialEq for Outcome