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#### 6.18.3.1 Weak hash tables

- Scheme Procedure:
**make-weak-key-hash-table***size* - Scheme Procedure:
**make-weak-value-hash-table***size* - Scheme Procedure:
**make-doubly-weak-hash-table***size* - C Function:
**scm_make_weak_key_hash_table***(size)* - C Function:
**scm_make_weak_value_hash_table***(size)* - C Function:
**scm_make_doubly_weak_hash_table***(size)* Return a weak hash table with

`size`buckets. As with any hash table, choosing a good size for the table requires some caution.You can modify weak hash tables in exactly the same way you would modify regular hash tables. (see section Hash Tables)

- Scheme Procedure:
**weak-key-hash-table?***obj* - Scheme Procedure:
**weak-value-hash-table?***obj* - Scheme Procedure:
**doubly-weak-hash-table?***obj* - C Function:
**scm_weak_key_hash_table_p***(obj)* - C Function:
**scm_weak_value_hash_table_p***(obj)* - C Function:
**scm_doubly_weak_hash_table_p***(obj)* Return

`#t`

if`obj`is the specified weak hash table. Note that a doubly weak hash table is neither a weak key nor a weak value hash table.

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