Pass bound values as const values to the bound function

base/bind_unittest.nc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is a "No Compile Test" suite.
 // http://dev.chromium.org/developers/testing/no-compile-tests
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/macros.h"
@@ skipping 128 matching lines @@
 // First, non-const reference parameters are disallowed by the Google
 // style guide. Second, since we are doing argument forwarding it becomes
 // very tricky to avoid copies, maintain const correctness, and not
 // accidentally have the function be modifying a temporary, or a copy.
 void WontCompile() {
   Parent p;
   Callback<int(Parent&)> ref_arg_cb = Bind(&UnwrapParentRef);
   ref_arg_cb.Run(p);
 }
 
-#elif defined(NCTEST_DISALLOW_BIND_TO_NON_CONST_REF_PARAM)  // [r"fatal error: static_assert failed \"do not bind functions with nonconst ref\""]
+#elif defined(NCTEST_DISALLOW_BIND_TO_NON_CONST_REF_PARAM)  // [r"fatal error: binding value of type 'const base::Parent' to reference to type 'base::Parent' drops 'const' qualifier"]
 
 // Binding functions with reference parameters, unsupported.
 //
 // See comment in NCTEST_DISALLOW_NON_CONST_REF_PARAM
 void WontCompile() {
   Parent p;
   Callback<int()> ref_cb = Bind(&UnwrapParentRef, p);
   ref_cb.Run();
 }
 
@@ skipping 37 matching lines @@
 #elif defined(NCTEST_DISALLOW_ASSIGN_DIFFERENT_TYPES)  // [r"fatal error: no viable conversion from 'Callback<MakeUnboundRunType<void \(\*\)\(int\)>>' to 'Callback<void \(\)>'"]
 
 // Bind result cannot be assigned to Callbacks with a mismatching type.
 void WontCompile() {
   Closure callback_mismatches_bind_type = Bind(&VoidPolymorphic1<int>);
 }
 
 #endif
 
 }  // namespace base