https://github.com/hvass-labs/arrayops

Vector Computation in C++
https://github.com/hvass-labs/arrayops

Last synced: 6 months ago
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Vector Computation in C++

• Host: GitHub
• URL: https://github.com/hvass-labs/arrayops
• Owner: Hvass-Labs
• License: lgpl-2.1
• Created: 2020-02-09T13:40:25.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-02-09T13:55:34.000Z (over 5 years ago)
• Last Synced: 2025-02-09T09:12:42.043Z (8 months ago)
• Size: 405 KB
• Stars: 2
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# ArrayOps

ArrayOps is my old library from 2006 for performing vector computations in C++. It is conceptually similar to the valarray-class of the Standard Template Library (STL). However, ArrayOps employs socalled [Template Meta-Programming](http://en.wikipedia.org/wiki/Template_metaprogramming) along with other advanced object-oriented programming techniques to improve efficiency and flexibility. ArrayOps essentially provides syntactic sugar for vector-notation which automatically compiles into a single flattened loop for each assignment involving vector expressions.

ArrayOps had a number of advantages over similar libraries from that time (e.g. Blitz++ and POOMA), including a much simpler framework that easens the maintenance and user-specialization, which means ArrayOps also provides different vector-datatypes that are tailored to specific needs, and all vector-datatypes may be combined arbitrarily in arithmetic expressions.

## Example

To illustrate the basic idea of ArrayOps, consider the following C++ source-code example where we create and manipulate three arrays, each containing 100 elements:

    const unsigned int k = 100;

    ArrayOps::Array A(k), B(k), C(k);

    double b, c;

    // Read numbers b and c from somewhere ...

    // Read arrays B and C from somewhere ...

    A = b*B + c*C;

Here, due to the use of socalled meta-programming, the last line is automatically transformed at compile-time into the following loop:

    for (unsigned int i=0; i