BPL support for exporting/importing class wrappers.

[SVN r8788]

example/getting_started1.cpp

@@ -0,0 +1,32 @@
+#include <string>
+
+namespace { // Avoid cluttering the global namespace.
+
+  // A couple of simple C++ functions that we want to expose to Python.
+  std::string greet() { return "hello, world"; }
+  int square(int number) { return number * number; }
+}
+
+#include <boost/python/class_builder.hpp>
+namespace python = boost::python;
+
+// Python requires an exported function called init<module-name> in every
+// extension module. This is where we build the module contents.
+extern "C"
+DL_EXPORT(void)
+initgetting_started1()
+{
+  try
+  {
+    // Create an object representing this extension module.
+    python::module_builder this_module("getting_started1");
+
+    // Add regular functions to the module.
+    this_module.def(greet, "greet");
+    this_module.def(square, "square");
+  }
+  catch(...)
+  {
+    python::handle_exception(); // Deal with the exception for Python
+  }
+}