Example of bug in functions returning bool overriden in python

example/example12.cpp

@@ -27,6 +27,7 @@ public:
         return state + value;
     }
 
+    virtual bool run_bool() = 0;
     virtual void pure_virtual() = 0;
 private:
     int state;
@@ -47,6 +48,14 @@ public:
         );
     }
 
+    virtual bool run_bool() {
+        PYBIND11_OVERLOAD_PURE(
+            bool,
+            Example12,
+            run_bool
+        );
+    }
+
     virtual void pure_virtual() {
         PYBIND11_OVERLOAD_PURE(
             void,         /* Return type */
@@ -61,6 +70,10 @@ int runExample12(Example12 *ex, int value) {
     return ex->run(value);
 }
 
+bool runExample12Bool(Example12* ex) {
+    return ex->run_bool();
+}
+
 void runExample12Virtual(Example12 *ex) {
     ex->pure_virtual();
 }
@@ -75,8 +88,10 @@ void init_ex12(py::module &m) {
         .def(py::init<int>())
         /* Reference original class in function definitions */
         .def("run", &Example12::run)
+        .def("run_bool", &Example12::run_bool)
         .def("pure_virtual", &Example12::pure_virtual);
 
     m.def("runExample12", &runExample12);
+    m.def("runExample12Bool", &runExample12Bool);
     m.def("runExample12Virtual", &runExample12Virtual);
 }

example/example12.py

@@ -3,7 +3,7 @@ from __future__ import print_function
 import sys
 sys.path.append('.')
 
-from example import Example12, runExample12, runExample12Virtual
+from example import Example12, runExample12, runExample12Virtual, runExample12Bool
 
 
 class ExtendedExample12(Example12):
@@ -15,6 +15,10 @@ class ExtendedExample12(Example12):
         print('ExtendedExample12::run(%i), calling parent..' % value)
         return super(ExtendedExample12, self).run(value + 1)
 
+    def run_bool(self):
+        print('ExtendedExample12::run_bool()')
+        return False
+
     def pure_virtual(self):
         print('ExtendedExample12::pure_virtual(): %s' % self.data)
 
@@ -28,4 +32,5 @@ except Exception as e:
 
 ex12p = ExtendedExample12(10)
 print(runExample12(ex12p, 20))
+print(runExample12Bool(ex12p))
 runExample12Virtual(ex12p)

example/example12.ref

@@ -6,6 +6,8 @@ Constructing Example12..
 ExtendedExample12::run(20), calling parent..
 Original implementation of Example12::run(state=11, value=21)
 32
+ExtendedExample12::run_bool()
+False
 ExtendedExample12::pure_virtual(): Hello world
 Destructing Example12..
 Destructing Example12..