Moved a small code snippet to the examples directory.

docs/examples/userguide/wrapping_CPlusPlus/python_to_cpp.pyx

+# distutils: language = c++
+
+from libcpp.string cimport string
+from libcpp.vector cimport vector
+
+py_bytes_object = b'The knights who say ni'
+py_unicode_object = u'Those who hear them seldom live to tell the tale.'
+
+cdef string s = py_bytes_object
+print(s)  # b'The knights who say ni'
+
+cdef string cpp_string = <string> py_unicode_object.encode('utf-8')
+print(cpp_string)  # b'Those who hear them seldom live to tell the tale.'
+
+cdef vector[int] vect = range(1, 10, 2)
+print(vect)  # [1, 3, 5, 7, 9]
+
+cdef vector[string] cpp_strings = b'It is a good shrubbery'.split()
+print(cpp_strings[1])   # b'is'

docs/src/userguide/wrapping_CPlusPlus.rst

@@ -374,20 +374,9 @@ how to declare C++ classes.
 Since Cython 0.17, the STL containers coerce from and to the
 corresponding Python builtin types.  The conversion is triggered
 either by an assignment to a typed variable (including typed function
-arguments) or by an explicit cast, e.g.::
+arguments) or by an explicit cast, e.g.:
 
-    from libcpp.string cimport string
-    from libcpp.vector cimport vector
-
-    cdef string s = py_bytes_object
-    print(s)
-    cpp_string = <string> py_unicode_object.encode('utf-8')
-
-    cdef vector[int] vect = xrange(1, 10, 2)
-    print(vect)              # [1, 3, 5, 7, 9]
-
-    cdef vector[string] cpp_strings = b'ab cd ef gh'.split()
-    print(cpp_strings[1])   # b'cd'
+.. literalinclude:: ../../examples/userguide/wrapping_CPlusPlus/python_to_cpp.pyx
 
 The following coercions are available: