Callback support for unbound reference and array arguments.

Because the callback object uses const An& for the type of the Run() function in argument forwarding, the code breaks for An=T& or An=T[].  This CL adds in code to modify the parameter type to remove duplicate references, and other fun.

BUG=35223
TEST=new unittests

Review URL: http://codereview.chromium.org/6718021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@79239 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 57 insertions, 43 deletions

diff --git a/base/callback.h b/base/callback.h
index bcc3dfd..2e17ae9 100644
--- a/base/callback.h
+++ b/base/callback.h
@@ -3,6 +3,7 @@
 // DO NOT EDIT BY HAND!!!
 
 
+
 // 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.
@@ -225,7 +226,8 @@ class Callback;
 template <typename R>
 class Callback<R(void)> : public internal::CallbackBase {
  public:
-  typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*);
+  typedef R(*PolymorphicInvoke)(
+      internal::InvokerStorageBase*);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
@@ -254,7 +256,9 @@ class Callback<R(void)> : public internal::CallbackBase {
 template <typename R, typename A1>
 class Callback<R(A1)> : public internal::CallbackBase {
  public:
-  typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&);
+  typedef R(*PolymorphicInvoke)(
+      internal::InvokerStorageBase*,
+          typename internal::ParamTraits<A1>::ForwardType);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
@@ -272,7 +276,7 @@ class Callback<R(A1)> : public internal::CallbackBase {
           &invoker_holder.invoker_storage_) {
   }
 
-  R Run(const A1& a1) const {
+  R Run(typename internal::ParamTraits<A1>::ForwardType a1) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
@@ -283,8 +287,10 @@ class Callback<R(A1)> : public internal::CallbackBase {
 template <typename R, typename A1, typename A2>
 class Callback<R(A1, A2)> : public internal::CallbackBase {
  public:
-  typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&,
-                                const A2&);
+  typedef R(*PolymorphicInvoke)(
+      internal::InvokerStorageBase*,
+          typename internal::ParamTraits<A1>::ForwardType,
+          typename internal::ParamTraits<A2>::ForwardType);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
@@ -302,8 +308,8 @@ class Callback<R(A1, A2)> : public internal::CallbackBase {
           &invoker_holder.invoker_storage_) {
   }
 
-  R Run(const A1& a1,
-        const A2& a2) const {
+  R Run(typename internal::ParamTraits<A1>::ForwardType a1,
+        typename internal::ParamTraits<A2>::ForwardType a2) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
@@ -315,9 +321,11 @@ class Callback<R(A1, A2)> : public internal::CallbackBase {
 template <typename R, typename A1, typename A2, typename A3>
 class Callback<R(A1, A2, A3)> : public internal::CallbackBase {
  public:
-  typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&,
-                                const A2&,
-                                const A3&);
+  typedef R(*PolymorphicInvoke)(
+      internal::InvokerStorageBase*,
+          typename internal::ParamTraits<A1>::ForwardType,
+          typename internal::ParamTraits<A2>::ForwardType,
+          typename internal::ParamTraits<A3>::ForwardType);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
@@ -335,9 +343,9 @@ class Callback<R(A1, A2, A3)> : public internal::CallbackBase {
           &invoker_holder.invoker_storage_) {
   }
 
-  R Run(const A1& a1,
-        const A2& a2,
-        const A3& a3) const {
+  R Run(typename internal::ParamTraits<A1>::ForwardType a1,
+        typename internal::ParamTraits<A2>::ForwardType a2,
+        typename internal::ParamTraits<A3>::ForwardType a3) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
@@ -350,10 +358,12 @@ class Callback<R(A1, A2, A3)> : public internal::CallbackBase {
 template <typename R, typename A1, typename A2, typename A3, typename A4>
 class Callback<R(A1, A2, A3, A4)> : public internal::CallbackBase {
  public:
-  typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&,
-                                const A2&,
-                                const A3&,
-                                const A4&);
+  typedef R(*PolymorphicInvoke)(
+      internal::InvokerStorageBase*,
+          typename internal::ParamTraits<A1>::ForwardType,
+          typename internal::ParamTraits<A2>::ForwardType,
+          typename internal::ParamTraits<A3>::ForwardType,
+          typename internal::ParamTraits<A4>::ForwardType);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
@@ -371,10 +381,10 @@ class Callback<R(A1, A2, A3, A4)> : public internal::CallbackBase {
           &invoker_holder.invoker_storage_) {
   }
 
-  R Run(const A1& a1,
-        const A2& a2,
-        const A3& a3,
-        const A4& a4) const {
+  R Run(typename internal::ParamTraits<A1>::ForwardType a1,
+        typename internal::ParamTraits<A2>::ForwardType a2,
+        typename internal::ParamTraits<A3>::ForwardType a3,
+        typename internal::ParamTraits<A4>::ForwardType a4) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
@@ -389,11 +399,13 @@ template <typename R, typename A1, typename A2, typename A3, typename A4,
     typename A5>
 class Callback<R(A1, A2, A3, A4, A5)> : public internal::CallbackBase {
  public:
-  typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&,
-                                const A2&,
-                                const A3&,
-                                const A4&,
-                                const A5&);
+  typedef R(*PolymorphicInvoke)(
+      internal::InvokerStorageBase*,
+          typename internal::ParamTraits<A1>::ForwardType,
+          typename internal::ParamTraits<A2>::ForwardType,
+          typename internal::ParamTraits<A3>::ForwardType,
+          typename internal::ParamTraits<A4>::ForwardType,
+          typename internal::ParamTraits<A5>::ForwardType);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
@@ -411,11 +423,11 @@ class Callback<R(A1, A2, A3, A4, A5)> : public internal::CallbackBase {
           &invoker_holder.invoker_storage_) {
   }
 
-  R Run(const A1& a1,
-        const A2& a2,
-        const A3& a3,
-        const A4& a4,
-        const A5& a5) const {
+  R Run(typename internal::ParamTraits<A1>::ForwardType a1,
+        typename internal::ParamTraits<A2>::ForwardType a2,
+        typename internal::ParamTraits<A3>::ForwardType a3,
+        typename internal::ParamTraits<A4>::ForwardType a4,
+        typename internal::ParamTraits<A5>::ForwardType a5) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
 
@@ -431,12 +443,14 @@ template <typename R, typename A1, typename A2, typename A3, typename A4,
     typename A5, typename A6>
 class Callback<R(A1, A2, A3, A4, A5, A6)> : public internal::CallbackBase {
  public:
-  typedef R(*PolymorphicInvoke)(internal::InvokerStorageBase*, const A1&,
-                                const A2&,
-                                const A3&,
-                                const A4&,
-                                const A5&,
-                                const A6&);
+  typedef R(*PolymorphicInvoke)(
+      internal::InvokerStorageBase*,
+          typename internal::ParamTraits<A1>::ForwardType,
+          typename internal::ParamTraits<A2>::ForwardType,
+          typename internal::ParamTraits<A3>::ForwardType,
+          typename internal::ParamTraits<A4>::ForwardType,
+          typename internal::ParamTraits<A5>::ForwardType,
+          typename internal::ParamTraits<A6>::ForwardType);
 
   Callback() : CallbackBase(NULL, NULL) { }
 
@@ -454,12 +468,12 @@ class Callback<R(A1, A2, A3, A4, A5, A6)> : public internal::CallbackBase {
           &invoker_holder.invoker_storage_) {
   }
 
-  R Run(const A1& a1,
-        const A2& a2,
-        const A3& a3,
-        const A4& a4,
-        const A5& a5,
-        const A6& a6) const {
+  R Run(typename internal::ParamTraits<A1>::ForwardType a1,
+        typename internal::ParamTraits<A2>::ForwardType a2,
+        typename internal::ParamTraits<A3>::ForwardType a3,
+        typename internal::ParamTraits<A4>::ForwardType a4,
+        typename internal::ParamTraits<A5>::ForwardType a5,
+        typename internal::ParamTraits<A6>::ForwardType a6) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);