1 files changed, 111 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/warn/Wparentheses-22.C b/gcc/testsuite/g++.dg/warn/Wparentheses-22.C
new file mode 100644
index 000000000..395953dd4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wparentheses-22.C
@@ -0,0 +1,111 @@
+// { dg-do compile }
+// { dg-options "-Wparentheses" }
+
+// Warnings for assignments used as truth-values when using classes.
+// Like Wparentheses-1.C, but with a class.
+
+int foo (int);
+
+class C
+{
+ public:
+  C()
+    : b(0)
+  { }
+
+  // Use default assignment constructor.
+
+  // Provide conversion to bool so that an instance of this class will
+  // work as a condition.
+  operator bool() const
+  { return b != 0; }
+
+ private:
+  int b;
+};
+
+C a, b, c;
+bool d;
+
+void
+bar (void)
+{
+  if (a = b) // { dg-warning "assignment" "correct warning" }
+    foo (0);
+  if ((a = b))
+    foo (1);
+  if (a = a) // { dg-warning "assignment" "correct warning" }
+    foo (2);
+  if ((a = a))
+    foo (3);
+  if (b = c) // { dg-warning "assignment" "correct warning" }
+    foo (4);
+  else
+    foo (5);
+  if ((b = c))
+    foo (6);
+  else
+    foo (7);
+  if (b = b) // { dg-warning "assignment" "correct warning" }
+    foo (8);
+  else
+    foo (9);
+  if ((b = b))
+    foo (10);
+  else
+    foo (11);
+  while (c = b) // { dg-warning "assignment" "correct warning" }
+    foo (12);
+  while ((c = b))
+    foo (13);
+  while (c = c) // { dg-warning "assignment" "correct warning" }
+    foo (14);
+  while ((c = c))
+    foo (15);
+  do foo (16); while (a = b); // { dg-warning "assignment" "correct warning" }
+  do foo (17); while ((a = b));
+  do foo (18); while (a = a); // { dg-warning "assignment" "correct warning" }
+  do foo (19); while ((a = a));
+  for (;c = b;) // { dg-warning "assignment" "correct warning" }
+    foo (20);
+  for (;(c = b);)
+    foo (21);
+  for (;c = c;) // { dg-warning "assignment" "correct warning" }
+    foo (22);
+  for (;(c = c);)
+    foo (23);
+  d = a = b; // { dg-warning "assignment" "correct warning" }
+  foo (24);
+  d = (a = b);
+  foo (25);
+  d = a = a; // { dg-warning "assignment" "correct warning" }
+  foo (26);
+  d = (a = a);
+  foo (27);
+  if (C(a))
+    foo (28);
+}
+
+bool
+bar1 (void)
+{
+  return a = b; // { dg-warning "assignment" "correct warning" }
+}
+
+bool
+bar2 (void)
+{
+  return (a = b);
+}
+
+bool
+bar3 (void)
+{
+  return a = a; // { dg-warning "assignment" "correct warning" }
+}
+
+bool
+bar4 (void)
+{
+  return (a = a);
+}