1 files changed, 72 insertions, 0 deletions
diff --git a/tests/run/cpp_stl_optional.pyx b/tests/run/cpp_stl_optional.pyx
new file mode 100644
index 000000000..feb8660d1
--- /dev/null
+++ b/tests/run/cpp_stl_optional.pyx
@@ -0,0 +1,72 @@
+# ticket: 3293
+# mode: run
+# tag: cpp, cpp17, werror
+
+from cython.operator cimport dereference as deref
+from libcpp.optional cimport optional, nullopt, make_optional
+from libcpp.string cimport string
+from libcpp.pair cimport pair
+
+def simple_test():
+    """
+    >>> simple_test()
+    """
+    cdef optional[int] o
+    assert(not o.has_value())
+    o = 5
+    assert(o.has_value())
+    assert(o.value()==5)
+    o.reset()
+    assert(not o.has_value())
+
+def operator_test():
+    """
+    >>> operator_test()
+    """
+    cdef optional[int] o1, o2
+
+    # operator bool
+    assert(not o1)
+    o1 = 5
+    assert(o1)
+
+    # operator *
+    assert(deref(o1) == 5)
+
+    # operator =,==,!=,>,<,>=,<=
+    assert(not o1 == o2)
+    assert(o1 != o2)
+    o2 = o1
+    assert(o1 == o2)
+    assert(not o1 > o2)
+    assert(not o1 < o2)
+    assert(o1 >= o2)
+    assert(o1 <= o2)
+
+    # operators =,== for other types (all related operators are identical)
+    o1 = 6
+    assert(o1 == 6)
+    o2 = nullopt
+    assert(o2 == nullopt)
+
+def misc_methods_test():
+    """
+    >>> misc_methods_test()
+    """
+
+    # make_optional
+    cdef optional[int] o
+    o = make_optional[int](5)
+    assert(o == 5)
+
+    # swap
+    o.swap(optional[int](6))
+    assert(o == 6)
+
+    # emplace
+    cdef optional[pair[int,int]] op
+    cdef pair[int,int]* val_ptr = &op.emplace(1,2)
+    assert(op.has_value())
+    assert(op.value() == pair[int,int](1,2))
+    assert(&op.value() == val_ptr) # check returned reference
+