CASC is a modern and header-only C++ library which provides a data structure to represent arbitrary dimension abstract simplicial complexes with user-defined classes stored directly on the simplices at each dimension. This is achieved by taking advantage of the combinatorial nature of simplicial complexes and new C++ code features such as: variadic templates and automatic function return type deduction. Essentially CASC stores the full topology of the complex according to a Hasse diagram. The representation of the topology is decoupled from interactions of user data through the use of metatemplate programming.

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

CASC does not have any dependencies other than the C++ standard library. If you wish to use CASC, you can use the header files right away. There is no binary library to link to, and no configured header file. CASC is a pure template library defined in the headers.

We use the CMake build system (version 3+), but only to build the documentation and unit-tests, and to automate installation.

Doxygen and Graphviz are used to generate the documentation.

To use CASC in your software all you will need is a working C++ compiler with full C++14 support. This includes:

• GCC Versions 5+
• Clang Versions 3, 5+^†
• XCode 8+^†

^† Note that there is a known issue with Clang 4.x.x versioned compilers (including XCode version 9.[0-2]), where the most specialized unique specialization is not selected leading to a compiler error. The current workaround to this problem is to either use GCC or to obtain Clang version 5+ (XCode version 9.3beta+).

CASC is header only meaning that there is nothing to compile out of the box. To use CASC, simply copy the desired headers into your project and included as necessary. If you wish to install CASC using CMake to your system, even though the library is header only, you must first create a new folder to prevent in-source "builds".

mkdir build
cd build

Subsequently run CMake specifying the installation prefix and the path to the root level CMakeLists.txt file.

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/ ..
make install

Unit tests are also packaged along with CASC and are dependent upon Googles C++ test framework. If you wish to build and run the tests, set the flag -DBUILD_CASCTESTS=on in your CMake command. CMake will then download and build googletest and link it with the CASC unit tests.

cmake -DBUILD_CASCTESTS=on ..
make
make tests  		# Run tests through make
./bin/casctests 	# Alternatively run the tests directly (more verbose)

A current version of the documentation is available online via github pages. You can also build the documentation locally if you have Doxygen and Graphviz on your system. CMake will automatically try to find a working Doxygen installation. If CMake is able to find your doxygen installation then the following sequence of commands will build the basic documentation.

cmake ..
make docs

If you are contributing to or modifying the CASC library you may wish to document private class members or currently hidden metatemplate helper functions. Configure the repository with this extra cmake option to expose the details before building the documentation.

-DCASC_DOCS_ADVANCED=ON

We use Github for versioning. For the versions available, please see the releases. If you find a bug or with to request additional functionality please file an issue in the CASC Github project.

John Moody
Department of Mathematics
University of California, San Diego

Christopher T. Lee
Department of Chemistry & Biochemistry
University of California, San Diego

See also the list of contributors who participated in this project.

Please cite the above Zenodo DOI to acknowledge the software version and cite the following paper:
Lee, C. T.; Moody, J. B.; Amaro, R. E.; Mccammon, J. A.; Holst, M. J. The Implementation of the Colored Abstract Simplicial Complex and Its Application to Mesh Generation. ACM Trans. Math. Softw. 2019, 45 (3), 1–20.

This project is licensed under the GNU Lesser General Public License v2.1 - please see the COPYING.md file for details.

This project is supported by the National Institutes of Health under grant numbers P41-GM103426 (NBCR), T32-GM008326, and R01-GM31749. It is also supported in part by the National Science Foundation under awards DMS-CM1620366 and DMS-FRG1262982.