ObjectSpace::WeakMap#delete

map.delete(key) → value or nil

map.delete(key) {|key| ... } → object

static VALUE
wmap_delete(VALUE self, VALUE key)
{
    struct weakmap *w;
    TypedData_Get_Struct(self, struct weakmap, &weakmap_type, w);

    VALUE orig_key = key;
    st_data_t orig_key_data = (st_data_t)&orig_key;
    st_data_t orig_val_data;
    if (st_delete(w->table, &orig_key_data, &orig_val_data)) {
        VALUE orig_val = *(VALUE *)orig_val_data;

        rb_gc_remove_weak(self, (VALUE *)orig_key_data);
        rb_gc_remove_weak(self, (VALUE *)orig_val_data);

        struct weakmap_entry *entry = (struct weakmap_entry *)orig_key_data;
        ruby_sized_xfree(entry, sizeof(struct weakmap_entry));

        if (wmap_live_p(orig_val)) {
            return orig_val;
        }
    }

    if (rb_block_given_p()) {
        return rb_yield(key);
    }
    else {
        return Qnil;
    }
}

Deletes the entry for the given key and returns its associated value.

If no block is given and key is found, deletes the entry and returns the associated value:

Example

m = ObjectSpace::WeakMap.new
key = "foo"
m[key] = 1
m.delete(key) # => 1
m[key] # => nil

If no block is given and key is not found, returns nil.

If a block is given and key is found, ignores the block, deletes the entry, and returns the associated value:

Example

m = ObjectSpace::WeakMap.new
key = "foo"
m[key] = 2
m.delete(key) { |key| raise 'Will never happen'} # => 2

If a block is given and key is not found, yields the key to the block and returns the block’s return value:

Example

m = ObjectSpace::WeakMap.new
m.delete("nosuch") { |key| "Key #{key} not found" } # => "Key nosuch not found"

Ruby version changes

3.3
- ObjectSpace::WeakMap#delete was added to eagerly clear weak map entries. [Feature #19561]

See also #[]= #each #[] #each_key also in 4.1 · 4.0 · 3.3

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