Fast Index Library

An easy-to-use and flexible open source C++ template library to build full text indexes.

• ... is easy-to-use
  The library offers consistent and well-designed interfaces. The interfaces and naming conventions of all functions and classes are similar to those of the STL (Standard Template Library). Hence, each developer who is familiar with the STL won't have any problems using the Fast Index Library.
• ... offers high performance
  The performance and memory efficiency of the library are very important points and have a great impact on design decisions. The library scales well to millions of indexed documents and is able to handle several Gigabytes of text.
• ... is flexible
  The library is a template library and templates are used extensively. All index classes are parameterized through templates. For instance, templates are used to specify compression algorithms, storage engines or the tokenizer of an index.
• ... is well tested
  All components are well tested through automatic tests. We have tests to check the correctness of components but also to check the performance of central components because the performance of the library is as important as its correctness. Due to these performance tests it is guaranteed that modifications to an individual component do not have a negative impact on that or other components.

Furthermore, the Fast Index Library offers different types of indexes each designed for different types of applications. For instance, it contains indexes for the following models:

• Boolean model
• Vector model
• Extended Boolean model
• Probabilistic model