add pybind11 test example

.gitignore

@@ -40,3 +40,4 @@ dist
 *.png
 *.fig
 *.vtk
+*.so

CMakeLists.txt

@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSUION 3.0)
+project(fealpy_extent CXX)
+add_subdirectory(src)

setup_linux_with_extent.py

@@ -0,0 +1,48 @@
+from setuptools import Extension, setup
+
+class get_pybind_include:
+    """Helper class to determine the pybind11 include path. The purpose of this class is
+    to postpone importing pybind11 until it is actually installed, so that the
+    ``get_include()`` method can be invoked.
+    """
+    def __init__(self, user=False):
+        self.user = user
+
+    def __str__(self):
+        import pybind11
+        return pybind11.get_include(self.user)
+
+ext_modules = [
+    Extension(
+        "fealpy_extent",
+        [
+            "src/pybind11.cpp",
+        ],
+        language="C++",
+        include_dirs=[
+            get_pybind_include(),
+            get_pybind_include(user=True)
+        ],
+        libraries=["stdc++"],
+    )
+]
+
+if __name__ == "__main__":
+    setup(name='fealpy',
+          version='1.0',
+          description='FEALPy: Finite Element Analysis Library in Python',
+          url='http://github.com/weihuayi/fealpy',
+          author='Huayi Wei',
+          author_email='[email protected]',
+          license='GNU',
+          packages=['fealpy'],
+          install_requires=[
+              'numpy',
+              'scipy',
+              'matplotlib',
+              'pyamg',
+              'meshpy',
+              'meshio'
+          ],
+          ext_modules = ext_modules
+      )

src/CMakeLists.txt

@@ -0,0 +1,4 @@
+find_package(pybind11 REQUIRED)
+FILE(GLOB SRCS "${CMAKE_CURRENT_SOURCE_DIR}/*.cpp")
+pybind11_add_module(fealpy_extent ${SRCS})
+target_link_libraries(fealpy_extent PRIVATE)

src/pybind11.cpp

@@ -0,0 +1,13 @@
+#include <pybind11/pybind11.h>
+#include <pybind11/stl.h>
+
+namespace py = pybind11;
+
+int add(int i, int j) {
+    return i + j;
+}
+
+PYBIND11_MODULE(fealpy_extent, m){
+    m.doc() = "My first pybind11 example!";
+    m.def("add", &add,  "A function which adds two numbers");
+}