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 31