store_delete(+StoreHandle, ++Key)

StoreHandle

A store handle or store name

Key

A ground term

Description

The key can be arbitrarily complex, but must be a ground term.

The complexity of this operation is linear in the size of the key, since the key needs to be compared. For indexing purposes, a hash value is computed from the key, and the full depth of the key is taken into account.

Note: If StoreHandle is not a handle, then it must be an atom or a compound term, and the store is identified by this term's toplevel functor together with the context module.

Modes and Determinism

• store_delete(+, ++) is det

Modules

Exceptions

(4) instantiation fault

StoreHandle is uninstantiated

(4) instantiation fault

Key is not ground

(5) type error

StoreHandle is neither atom nor compound term nor store handle

(45) named object does not exist

StoreHandle is not the name of a store

Examples

    ?- store_create(Handle),
       store_set(Handle, tom, 12345),
       stored_keys_and_values(Handle, Before),
       store_delete(Handle, tom),
       stored_keys_and_values(Handle, After).

    Handle = $&(store,"17h3")
    Before = [tom - 12345]
    After = []
    Yes (0.00s cpu)

    ?- store_create(Handle),
       store_set(Handle, tom, 12345),
       store_delete(Handle, tom),
       store_delete(Handle, tom).

    Yes (0.00s cpu)
    

See Also