Add swap to queues

Cython/Includes/libcpp/queue.pxd

@@ -9,6 +9,9 @@ cdef extern from "<queue>" namespace "std" nogil:
         void pop()
         void push(T&)
         size_t size()
+        # C++11 methods
+        void swap(queue&)
+
     cdef cppclass priority_queue[T]:
         priority_queue() except +
         priority_queue(priority_queue&) except +
@@ -18,3 +21,5 @@ cdef extern from "<queue>" namespace "std" nogil:
         void push(T&)
         size_t size()
         T& top()
+        # C++11 methods
+        void swap(priority_queue&)

tests/run/cpp_stl_cpp11.pyx

@@ -5,6 +5,8 @@
 import sys
 from libcpp.unordered_map cimport unordered_map
 from libcpp.vector cimport vector
+from libcpp.queue cimport queue
+from libcpp.queue cimport priority_queue
 from libcpp.vector cimport vector
 from libcpp.pair cimport pair
 
@@ -26,6 +28,36 @@ def test_vector_functionality():
     return "pass"
 
 
+def test_queue_functionality():
+    """
+    >>> test_queue_functionality()
+    'pass'
+    """
+    cdef:
+        queue[int] int_queue = queue[int]()
+        queue[int] int_queue2 = queue[int]()
+    int_queue.push(77)
+    int_queue.swap(int_queue2)
+    assert int_queue.size() == 0
+    assert int_queue2.size() == 1
+    return "pass"
+
+
+def test_priority_queue_functionality():
+    """
+    >>> test_priority_queue_functionality()
+    'pass'
+    """
+    cdef:
+        priority_queue[int] int_queue = priority_queue[int]()
+        priority_queue[int] int_queue2 = priority_queue[int]()
+    int_queue.push(77)
+    int_queue.swap(int_queue2)
+    assert int_queue.size() == 0
+    assert int_queue2.size() == 1
+    return "pass"
+
+
 def test_unordered_map_functionality():
     """
     >>> test_unordered_map_functionality()