5. Brief description of the library's file structure

A brief description of the Quantum++ file structure is presented below. The directories and their brief descriptions are emphasized using bold fonts, as well as the main header file of the library, include/qpp.h.

File/folder name	Description
cmake/	CMake configuration files
examples/	Usage examples
include/	Header files
include/MATLAB/	MATLAB support
include/MATLAB/matlab.hpp	Input/output interfacing with MATLAB
include/classes/	Class definitions
include/classes/circuits/	Support for quantum circuits
include/classes/circuits/circuits.hpp	Quantum circuit descriptions
include/classes/circuits/engines.hpp	Quantum engines, execute quantum circuit descriptions
include/classes/codes.hpp	Quantum error correcting codes
include/classes/exception.hpp	Exceptions
include/classes/gates.hpp	Quantum gates
include/classes/idisplay.hpp	Interface for stream extraction
include/classes/init.hpp	Initialization
include/classes/layouts.hpp	Qudit placement layouts
include/classes/noise.hpp	Quantum noise models
include/classes/random_devices.hpp	Random devices
include/classes/reversible.hpp	Support for classical reversible circuits
include/classes/states.hpp	Quantum states
include/classes/timer.hpp	Timing
include/experimental/	Experimental/test functions/classes
include/experimental/experimental.hpp	Experimental/test functions/classes
include/internal/	Internal implementation details
include/internal/classes/	Internal class definitions
include/internal/classes/iomanip.hpp	Input/output manipulators
include/internal/classes/singleton.hpp	Singleton pattern via CRTP
include/internal/util.hpp	Internal utility functions
include/constants.hpp	Constants
include/entanglement.hpp	Entanglement functions
include/entropies.hpp	Entropy functions
include/functions.hpp	General purpose quantum computing functions
include/input_output.hpp	Input/output functions
include/instruments.hpp	Measurement functions
include/number_theory.hpp	Number theory functions (for native types)
include/operations.hpp	Quantum operations functions
include/qpp.h	Quantum++ main header file (includes others)
include/random.hpp	Randomness functions
include/statistics.hpp	Statistics functions
include/traits.hpp	Type traits
include/types.hpp	Type aliases
libs/	Additional dependencies
libs/pybind11/	Python bindings for C++ code
pyqpp/	Python 3 wrapper package for Quantum++
qasmtools/	OpenQASM parser
stress_tests/	Partial stress tests against Qiskit and QuTiP
unit_tests/	Unit testing via Google Test/Mock (source included)
.appveyor/	AppVeyor continuous integration scripts
.circleci/	CircleCI continuous integration configuration
.clang_format	clang-format configuration file
.gitattributes	git attributes configuration file
.gitignore	git configuration file
.travis.yml	Travis CI continuous integration config file
CHANGES	Cumulative modifications added by each version
CMakeLists.txt	CMake config. file for Quantum++ and unit tests
CODE OF CONDUCT.md	GitHub's code of conduct
CONTRIBUTING.md	GitHub's contributing rules
Doxyfile	Doxygen configuration file, needs Graphviz to be run
INSTALL.md	Installation guide, also available on the Wiki
LICENSE	MIT License
README.md	Detailed building/installing instructions
VERSION	Version number
appveyor.yml	AppVeyor continuous integration (Windows) config file
prettyprint.sh	Script for automatic code beautifier via clang-format
setup.py	Installer setup for the pyqpp Python 3 wrapper package