Merge pull request #2324 from gabrieldemarmiesse/update_cpp_examples

Update cpp examples

docs/examples/userguide/wrapping_CPlusPlus/Rectangle.cpp

@@ -0,0 +1,40 @@
+#include <iostream>
+#include "Rectangle.h"
+
+namespace shapes {
+
+	// Default constructor
+	Rectangle::Rectangle () {}
+
+	// Overloaded constructor
+	Rectangle::Rectangle (int x0, int y0, int x1, int y1) {
+		this->x0 = x0;
+		this->y0 = y0;
+		this->x1 = x1;
+		this->y1 = y1;
+	}
+
+	// Destructor
+	Rectangle::~Rectangle () {}
+
+	// Return the area of the rectangle
+	int Rectangle::getArea () {
+		return (this->x1 - this->x0) * (this->y1 - this->y0);
+	}
+
+	// Get the size of the rectangle.
+	// Put the size in the pointer args
+	void Rectangle::getSize (int *width, int *height) {
+		(*width) = x1 - x0;
+		(*height) = y1 - y0;
+	}
+
+	// Move the rectangle by dx dy
+	void Rectangle::move (int dx, int dy) {
+		this->x0 += dx;
+		this->y0 += dy;
+		this->x1 += dx;
+		this->y1 += dy;
+	}
+}
+

docs/examples/userguide/wrapping_CPlusPlus/Rectangle.h

@@ -0,0 +1,17 @@
+#ifndef RECTANGLE_H
+#define RECTANGLE_H
+
+namespace shapes {
+	class Rectangle {
+		public:
+			int x0, y0, x1, y1;
+			Rectangle();
+			Rectangle(int x0, int y0, int x1, int y1);
+			~Rectangle();
+			int getArea();
+			void getSize(int* width, int* height);
+			void move(int dx, int dy);
+	};
+}
+
+#endif

docs/examples/userguide/wrapping_CPlusPlus/Rectangle.pxd

@@ -0,0 +1,12 @@
+cdef extern from "Rectangle.cpp":
+    pass
+
+# Decalre the class with cdef
+cdef extern from "Rectangle.h" namespace "shapes":
+    cdef cppclass Rectangle:
+        Rectangle() except +
+        Rectangle(int, int, int, int) except +
+        int x0, y0, x1, y1
+        int getArea()
+        void getSize(int*width, int*height)
+        void move(int, int)

docs/examples/userguide/wrapping_CPlusPlus/cython_usage.pyx

@@ -0,0 +1,12 @@
+# distutils: language = c++
+
+from Rectangle cimport Rectangle
+
+def main():
+    rec_ptr = new Rectangle(1, 2, 3, 4)  # Instantiate a Rectangle object on the heap
+    try:
+        rec_area = rec_ptr.getArea()
+    finally:
+        del rec_ptr  # delete heap allocated object
+
+    cdef Rectangle rec_stack  # Instantiate a Rectangle object on the stack

docs/examples/userguide/wrapping_CPlusPlus/rect.pyx

@@ -0,0 +1,23 @@
+# distutils: language = c++
+
+from Rectangle cimport Rectangle
+
+# Create a Cython extension type which holds a C++ instance
+# as an attribute and create a bunch of forwarding methods
+# Python extension type.
+cdef class PyRectangle:
+    cdef Rectangle c_rect  # Hold a C++ instance which we're wrapping
+
+    def __cinit__(self, int x0, int y0, int x1, int y1):
+        self.c_rect = Rectangle(x0, y0, x1, y1)
+
+    def get_area(self):
+        return self.c_rect.getArea()
+
+    def get_size(self):
+        cdef int width, height
+        self.c_rect.getSize(&width, &height)
+        return width, height
+
+    def move(self, dx, dy):
+        self.c_rect.move(dx, dy)

docs/examples/userguide/wrapping_CPlusPlus/rect_ptr.pyx

@@ -0,0 +1,12 @@
+# distutils: language = c++
+
+from Rectangle cimport Rectangle
+
+cdef class PyRectangle:
+    cdef Rectangle*c_rect  # hold a pointer to the C++ instance which we're wrapping
+
+    def __cinit__(self, int x0, int y0, int x1, int y1):
+        self.c_rect = new Rectangle(x0, y0, x1, y1)
+
+    def __dealloc__(self):
+        del self.c_rect

docs/examples/userguide/wrapping_CPlusPlus/rect_with_attributes.pyx

@@ -0,0 +1,52 @@
+# distutils: language = c++
+
+from Rectangle cimport Rectangle
+
+cdef class PyRectangle:
+    cdef Rectangle c_rect
+
+    def __cinit__(self, int x0, int y0, int x1, int y1):
+        self.c_rect = Rectangle(x0, y0, x1, y1)
+
+    def get_area(self):
+        return self.c_rect.getArea()
+
+    def get_size(self):
+        cdef int width, height
+        self.c_rect.getSize(&width, &height)
+        return width, height
+
+    def move(self, dx, dy):
+        self.c_rect.move(dx, dy)
+
+    # Attribute access
+    @property
+    def x0(self):
+        return self.c_rect.x0
+    @x0.setter
+    def x0(self, x0):
+        self.c_rect.x0 = x0
+
+    # Attribute access
+    @property
+    def x1(self):
+        return self.c_rect.x1
+    @x1.setter
+    def x1(self, x1):
+        self.c_rect.x1 = x1
+
+    # Attribute access
+    @property
+    def y0(self):
+        return self.c_rect.y0
+    @y0.setter
+    def y0(self, y0):
+        self.c_rect.y0 = y0
+
+    # Attribute access
+    @property
+    def y1(self):
+        return self.c_rect.y1
+    @y1.setter
+    def y1(self, y1):
+        self.c_rect.y1 = y1

docs/examples/userguide/wrapping_CPlusPlus/setup.py

@@ -0,0 +1,5 @@
+from distutils.core import setup
+
+from Cython.Build import cythonize
+
+setup(ext_modules=cythonize("rect.pyx"))