src/chrome/browser/extensions/api/declarative_webrequest/request_stage.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/extensions/api/declarative_webrequest/request_stage.h"
   6
   7 #include "base/basictypes.h"
   8
   9 namespace extensions {
  10
  11 const unsigned int kActiveStages = ON_BEFORE_REQUEST |
  12                                    ON_BEFORE_SEND_HEADERS |
  13                                    ON_HEADERS_RECEIVED |
  14                                    ON_AUTH_REQUIRED;
  15
  16 // HighestBit<n> computes the highest bit of |n| in compile time, provided that
  17 // |n| is a positive compile-time constant.
  18 template <long unsigned int n>
  19 struct HighestBit {
  20   COMPILE_ASSERT(n > 0, argument_is_not_a_positive_compile_time_constant);
  21   enum { VALUE = HighestBit<(n >> 1)>::VALUE << 1 };
  22 };
  23 template <>
  24 struct HighestBit<1> {
  25   enum { VALUE = 1 };
  26 };
  27
  28 const unsigned int kLastActiveStage = HighestBit<kActiveStages>::VALUE;
  29
  30 }  // namespace extensions