fetchPut

Sets the value associated with the key in the map, and returns the old value. If the key was not in the map, returns null.

Function parameters

Parameters

self:*Self
key:Key
value:Value

Functions in this namespace

Functions

fromInt
EnumFieldStruct: Returns a struct with a field matching each unique named enum element.
valuesFromFields: Looks up the supplied fields in the given enum type.
values: Returns the set of all named values in the given enum, in
tagName: A safe alternative to @tagName() for non-exhaustive enums that doesn't
directEnumArrayLen: Determines the length of a direct-mapped enum array, indexed by
directEnumArray: Initializes an array of Data which can be indexed by
directEnumArrayDefault: Initializes an array of Data which can be indexed by
nameCast: Deprecated: Use @field(E, @tagName(tag)) or @field(E, string)
EnumSet: A set of enum elements, backed by a bitfield.
EnumMap: A map keyed by an enum, backed by a bitfield and a dense array.
EnumMultiset: A multiset of enum elements up to a count of usize.
BoundedEnumMultiset: A multiset of enum elements up to CountSize.
EnumArray: An array keyed by an enum, backed by a dense array.
EnumIndexer

Source

Implementation

pub fn fetchPut(self: *Self, key: Key, value: Value) ?Value {
    const index = Indexer.indexOf(key);
    const result: ?Value = if (self.bits.isSet(index)) self.values[index] else null;
    self.bits.set(index);
    self.values[index] = value;
    return result;
}