Merge pull request #123 from XanaduAI/better_c_calls

Expose C++ arrays to Python without data copying

.github/CHANGELOG.md

@@ -10,6 +10,10 @@
 
 * Updates and improves the speed and accuracy of `thewalrus.quantum.fock_tensor`. [#107](https://github.com/XanaduAI/thewalrus/pull/107)
 
+* Improves speed of the functions in `hermite_multidimensional.hpp`. [#123](https://github.com/XanaduAI/thewalrus/pull/123)
+
+* Improves speed of the functions in `thewalrus.fock_gradients` by doing calls to optimized functions in `hermite_multidimensional.hpp`. [#123](https://github.com/XanaduAI/thewalrus/pull/123)
+
 ### Bug fixes
 
 * Corrects typos in the random number generation in the C++ unit tests. [#118](https://github.com/XanaduAI/thewalrus/pull/118)

.gitignore

@@ -21,3 +21,4 @@ docs/libwalrus_cpp_api/*
 docs/.ipynb_checkpoints/*
 coverage.xml
 docs/code/api/*
+thewalrus/libwalrus.cpp

examples/Makefile

@@ -25,5 +25,11 @@ example.o: example.cpp
 example-cpp: example.o
 	$(CC) $^ $(LFLAGS) -o $@
 
+example_hermite.o: example_hermite.cpp
+	$(CC) $^ $(CFLAGS) -c
+
+example_hermite.out: example_hermite.o
+	$(CC) $^ $(LFLAGS) -o $@
+
 clean:
 	rm -rf *~ *.out *.o *.so *.pyc *.mod