# Miscellaneous hash APIs
[Hash table serialization support]

## Functions
svn_error_t * | svn_hash_keys (apr_array_header_t **array, apr_hash_t *hash, apr_pool_t *pool)
| Return the keys to hash in *array.
svn_error_t * | svn_hash_from_cstring_keys (apr_hash_t **hash, const apr_array_header_t *keys, apr_pool_t *pool)
| Set *hash to a new hash whose keys come from the items in keys (an array of `const char *` items), and whose values are match their corresponding key.
svn_error_t * | svn_hash__clear (apr_hash_t *hash, apr_pool_t *pool)
| Clear any key/value pairs in the hash table.

## Function Documentation

svn_error_t* svn_hash__clear | ( | apr_hash_t * | hash,
|  | apr_pool_t * | pool |
| ) |  |  |

Clear any key/value pairs in the hash table.

A wrapper for a apr_hash_clear(), which isn't available until APR 1.3.0.

Since:
  New in 1.5.

svn_error_t* svn_hash_from_cstring_keys | ( | apr_hash_t ** | hash,
|  | const apr_array_header_t * | keys,
|  | apr_pool_t * | pool |
| ) |  |  |

Set *hash to a new hash whose keys come from the items in keys (an array of `const char *` items), and whose values are match their corresponding key.

Use pool for all allocations (including *hash, its keys, and its values).

Since:
  New in 1.5.

svn_error_t* svn_hash_keys | ( | apr_array_header_t ** | array,
|  | apr_hash_t * | hash,
|  | apr_pool_t * | pool |
| ) |  |  |

Return the keys to hash in *array.

The keys are assumed to be (const char *). The keys are in no particular order.

*array itself is allocated in pool; however, the keys are not copied from the hash.

Since:
  New in 1.5.

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