Add m-esr52 at 52.6.0

1 files changed, 101 insertions, 0 deletions

diff --git a/security/sandbox/chromium/base/bind.h b/security/sandbox/chromium/base/bind.h
new file mode 100644
index 000000000..770e45706
--- /dev/null
+++ b/security/sandbox/chromium/base/bind.h
@@ -0,0 +1,101 @@
+// 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.
+
+#ifndef BASE_BIND_H_
+#define BASE_BIND_H_
+
+#include "base/bind_internal.h"
+#include "base/callback_internal.h"
+
+// -----------------------------------------------------------------------------
+// Usage documentation
+// -----------------------------------------------------------------------------
+//
+// See base/callback.h for documentation.
+//
+//
+// -----------------------------------------------------------------------------
+// Implementation notes
+// -----------------------------------------------------------------------------
+//
+// If you're reading the implementation, before proceeding further, you should
+// read the top comment of base/bind_internal.h for a definition of common
+// terms and concepts.
+//
+// RETURN TYPES
+//
+// Though Bind()'s result is meant to be stored in a Callback<> type, it
+// cannot actually return the exact type without requiring a large amount
+// of extra template specializations. The problem is that in order to
+// discern the correct specialization of Callback<>, Bind would need to
+// unwrap the function signature to determine the signature's arity, and
+// whether or not it is a method.
+//
+// Each unique combination of (arity, function_type, num_prebound) where
+// function_type is one of {function, method, const_method} would require
+// one specialization.  We eventually have to do a similar number of
+// specializations anyways in the implementation (see the Invoker<>,
+// classes).  However, it is avoidable in Bind if we return the result
+// via an indirection like we do below.
+//
+// TODO(ajwong): We might be able to avoid this now, but need to test.
+//
+// It is possible to move most of the static_assert into BindState<>, but it
+// feels a little nicer to have the asserts here so people do not need to crack
+// open bind_internal.h.  On the other hand, it makes Bind() harder to read.
+
+namespace base {
+
+template <typename Functor, typename... Args>
+base::Callback<
+    typename internal::BindState<
+        typename internal::FunctorTraits<Functor>::RunnableType,
+        typename internal::FunctorTraits<Functor>::RunType,
+        typename internal::CallbackParamTraits<Args>::StorageType...>
+            ::UnboundRunType>
+Bind(Functor functor, const Args&... args) {
+  // Type aliases for how to store and run the functor.
+  using RunnableType = typename internal::FunctorTraits<Functor>::RunnableType;
+  using RunType = typename internal::FunctorTraits<Functor>::RunType;
+
+  // Use RunnableType::RunType instead of RunType above because our
+  // checks below for bound references need to know what the actual
+  // functor is going to interpret the argument as.
+  using BoundRunType = typename RunnableType::RunType;
+
+  using BoundArgs =
+      internal::TakeTypeListItem<sizeof...(Args),
+                                 internal::ExtractArgs<BoundRunType>>;
+
+  // Do not allow binding a non-const reference parameter. Non-const reference
+  // parameters are disallowed by the Google style guide.  Also, binding a
+  // non-const reference parameter can make for subtle bugs because the
+  // invoked function will receive a reference to the stored copy of the
+  // argument and not the original.
+  static_assert(!internal::HasNonConstReferenceItem<BoundArgs>::value,
+                "do not bind functions with nonconst ref");
+
+  const bool is_method = internal::HasIsMethodTag<RunnableType>::value;
+
+  // For methods, we need to be careful for parameter 1.  We do not require
+  // a scoped_refptr because BindState<> itself takes care of AddRef() for
+  // methods. We also disallow binding of an array as the method's target
+  // object.
+  static_assert(!internal::BindsArrayToFirstArg<is_method, Args...>::value,
+                "first bound argument to method cannot be array");
+  static_assert(
+      !internal::HasRefCountedParamAsRawPtr<is_method, Args...>::value,
+      "a parameter is a refcounted type and needs scoped_refptr");
+
+  using BindState = internal::BindState<
+      RunnableType, RunType,
+      typename internal::CallbackParamTraits<Args>::StorageType...>;
+
+  return Callback<typename BindState::UnboundRunType>(
+      new BindState(internal::MakeRunnable(functor), args...));
+}
+
+}  // namespace base
+
+#endif  // BASE_BIND_H_