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/usr/include/dovecot/mail-index-alloc-cache.h is in dovecot-dev 1:2.2.9-1ubuntu2.

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#ifndef MAIL_INDEX_ALLOC_CACHE_H
#define MAIL_INDEX_ALLOC_CACHE_H

/* If using in-memory indexes, give index_dir=NULL. */
struct mail_index * ATTR_NULL(1, 2)
mail_index_alloc_cache_get(const char *mailbox_path,
			   const char *index_dir, const char *prefix);
void mail_index_alloc_cache_unref(struct mail_index **index);

void mail_index_alloc_cache_destroy_unrefed(void);

/* internal: */
void mail_index_alloc_cache_index_opened(struct mail_index *index);

#endif