Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/src/google/protobuf/stubs/casts.h

Index: third_party/protobuf/src/google/protobuf/stubs/casts.h
diff --git a/third_party/protobuf/src/google/protobuf/stubs/casts.h b/third_party/protobuf/src/google/protobuf/stubs/casts.h
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--- a/third_party/protobuf/src/google/protobuf/stubs/casts.h
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@@ -1,133 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2014 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef GOOGLE_PROTOBUF_CASTS_H__
-#define GOOGLE_PROTOBUF_CASTS_H__
-
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/type_traits.h>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-// Use implicit_cast as a safe version of static_cast or const_cast
-// for upcasting in the type hierarchy (i.e. casting a pointer to Foo
-// to a pointer to SuperclassOfFoo or casting a pointer to Foo to
-// a const pointer to Foo).
-// When you use implicit_cast, the compiler checks that the cast is safe.
-// Such explicit implicit_casts are necessary in surprisingly many
-// situations where C++ demands an exact type match instead of an
-// argument type convertable to a target type.
-//
-// The From type can be inferred, so the preferred syntax for using
-// implicit_cast is the same as for static_cast etc.:
-//
-//   implicit_cast<ToType>(expr)
-//
-// implicit_cast would have been part of the C++ standard library,
-// but the proposal was submitted too late.  It will probably make
-// its way into the language in the future.
-template<typename To, typename From>
-inline To implicit_cast(From const &f) {
-  return f;
-}
-
-// When you upcast (that is, cast a pointer from type Foo to type
-// SuperclassOfFoo), it's fine to use implicit_cast<>, since upcasts
-// always succeed.  When you downcast (that is, cast a pointer from
-// type Foo to type SubclassOfFoo), static_cast<> isn't safe, because
-// how do you know the pointer is really of type SubclassOfFoo?  It
-// could be a bare Foo, or of type DifferentSubclassOfFoo.  Thus,
-// when you downcast, you should use this macro.  In debug mode, we
-// use dynamic_cast<> to double-check the downcast is legal (we die
-// if it's not).  In normal mode, we do the efficient static_cast<>
-// instead.  Thus, it's important to test in debug mode to make sure
-// the cast is legal!
-//    This is the only place in the code we should use dynamic_cast<>.
-// In particular, you SHOULDN'T be using dynamic_cast<> in order to
-// do RTTI (eg code like this:
-//    if (dynamic_cast<Subclass1>(foo)) HandleASubclass1Object(foo);
-//    if (dynamic_cast<Subclass2>(foo)) HandleASubclass2Object(foo);
-// You should design the code some other way not to need this.
-
-template<typename To, typename From>     // use like this: down_cast<T*>(foo);
-inline To down_cast(From* f) {                   // so we only accept pointers
-  // Ensures that To is a sub-type of From *.  This test is here only
-  // for compile-time type checking, and has no overhead in an
-  // optimized build at run-time, as it will be optimized away
-  // completely.
-  if (false) {
-    implicit_cast<From*, To>(0);
-  }
-
-#if !defined(NDEBUG) && !defined(GOOGLE_PROTOBUF_NO_RTTI)
-  assert(f == NULL || dynamic_cast<To>(f) != NULL);  // RTTI: debug mode only!
-#endif
-  return static_cast<To>(f);
-}
-
-template<typename To, typename From>    // use like this: down_cast<T&>(foo);
-inline To down_cast(From& f) {
-  typedef typename remove_reference<To>::type* ToAsPointer;
-  // Ensures that To is a sub-type of From *.  This test is here only
-  // for compile-time type checking, and has no overhead in an
-  // optimized build at run-time, as it will be optimized away
-  // completely.
-  if (false) {
-    implicit_cast<From*, ToAsPointer>(0);
-  }
-
-#if !defined(NDEBUG) && !defined(GOOGLE_PROTOBUF_NO_RTTI)
-  // RTTI: debug mode only!
-  assert(dynamic_cast<ToAsPointer>(&f) != NULL);
-#endif
-  return *static_cast<ToAsPointer>(&f);
-}
-
-template<typename To, typename From>
-inline To bit_cast(const From& from) {
-  GOOGLE_COMPILE_ASSERT(sizeof(From) == sizeof(To),
-                        bit_cast_with_different_sizes);
-  To dest;
-  memcpy(&dest, &from, sizeof(dest));
-  return dest;
-}
-
-}  // namespace internal
-
-// We made these internal so that they would show up as such in the docs,
-// but we don't want to stick "internal::" in front of them everywhere.
-using internal::implicit_cast;
-using internal::down_cast;
-using internal::bit_cast;
-
-}  // namespace protobuf
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_CASTS_H__