fortran_associative_array

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fortran_associative_array

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An associative array (a.k.a. dictionary or hash table) implementation with Fortran

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# Fortran associative array [![Build Status](https://travis-ci.org/ysdtkm/fortran_associative_array.svg?branch=master)](https://travis-ci.org/ysdtkm/fortran_associative_array)
A scalable associative array (known as **hash table** or **dictionary**) for Fortran

## Specifications
* Internal data structure is treap (randomized binary search tree)
* Roughly corresponds to `std::map` (C++) or `dict` (Python)
    * A **key** can be `characters` (either fixed or arbitrary length), an `integer`, or a `real`
    * A **value** can be any fortran intrinsic data type (with fixed length or kind). A *copy* of the value is stored in the `dict` object
    * Does not affect Fortran's intrinsic random state
* Implemented operations

* Other operations allowed by the data structure (not implemented)

* Speed comparison with `gfortran`/`g++`, without compiler optimization

## Usage
* See `sample.f90` for sample usage
* Edit `dtypes.h` if using another data types
    * For string key (arbitrary length), `keytype1` should be `character(:),allocatable` and `keytype2` should be `character(*)`
    * For other key types, `keytype1` and `keytype2` are the same

## References
* Treap https://en.wikipedia.org/wiki/Treap
* Treap https://www.slideshare.net/iwiwi/2-12188757

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