# 64.5. Examples

The PostgreSQL source distribution includes several examples of index methods implemented using GiST. The core system currently provides text search support (indexing for `tsvector`and `tsquery`) as well as R-Tree equivalent functionality for some of the built-in geometric data types (see `src/backend/access/gist/gistproc.c`). The following `contrib` modules also contain GiST operator classes:`btree_gist`

B-tree equivalent functionality for several data types`cube`

Indexing for multidimensional cubes`hstore`

Module for storing (key, value) pairs`intarray`

RD-Tree for one-dimensional array of int4 values`ltree`

Indexing for tree-like structures`pg_trgm`

Text similarity using trigram matching`seg`

Indexing for “float ranges”