C++ namespace tests.

tests/run/cpp_namespaces.pyx

+cdef extern from "cpp_namespaces_helper.h" namespace "A":
+    ctypedef int A_t
+    A_t A_func(A_t first, A_t)
+
+cdef extern from "cpp_namespaces_helper.h" namespace "outer":
+    int outer_value
+
+cdef extern from "cpp_namespaces_helper.h" namespace "outer::inner":
+    int inner_value
+
+def test_function(x, y):
+    """
+    >>> test_function(1, 2)
+    3
+    >>> test_function(9, 16)
+    25
+    """
+    return A_func(x, y)
+
+def test_nested():
+    """
+    >>> test_nested()
+    10
+    100
+    """
+    print outer_value
+    print inner_value
+

tests/run/cpp_namespaces_helper.h

+namespace outer {
+    
+    int x = 10;
+    
+    int outer_value = 10;
+    
+    namespace inner {
+        
+        int x = 100;
+        
+        int inner_value = 100;
+        
+    }
+    
+}
+
+namespace A {
+    
+    typedef int A_t;
+    
+    A_t A_func(A_t first, A_t second) {
+        return first + second;
+    }
+    
+}