Enum Strategy 

pub enum Strategy {
    Append,
    Replace,
    Fail,
}

What to do where a layer supplies a value for a path that already has one.

Every strategy is terminal: it consumes the overlay whole and never recurses, so no rule below one can ever fire. The default merge is the absence of a rule, not a variant here.

The order of the variants is the tie-break used when reporting conflicts, so that the message does not depend on the order rules were given in.

Variants

Append

Concatenate base ++ overlay. Both sides must be arrays.

Replace

Assign wholesale, no recursion, even object over object.

Fail

Error. The first layer to define the path pins it.

Trait Implementations

impl Clone for Strategy

fn clone(&self) -> Strategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Strategy

impl Debug for Strategy

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

Formats the value using the given formatter.

impl Display for Strategy

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

Formats the value using the given formatter.

impl Eq for Strategy

impl Hash for Strategy

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Strategy

fn cmp(&self, other: &Strategy) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Strategy

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Strategy

fn partial_cmp(&self, other: &Strategy) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Strategy