cc/base/util.h

   1 // Copyright 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 #ifndef CC_BASE_UTIL_H_
   6 #define CC_BASE_UTIL_H_
   7
   8 #include <limits>
   9
  10 #include "base/basictypes.h"
  11
  12 namespace cc {
  13
  14 template <typename T> T RoundUp(T n, T mul) {
  15   static_assert(std::numeric_limits<T>::is_integer,
  16                 "T must be an integer type");
  17   return (n > 0) ? ((n + mul - 1) / mul) * mul
  18                  : (n / mul) * mul;
  19 }
  20
  21 template <typename T> T RoundDown(T n, T mul) {
  22   static_assert(std::numeric_limits<T>::is_integer,
  23                 "T must be an integer type");
  24   return (n > 0) ? (n / mul) * mul
  25                  : (n == 0) ? 0
  26                  : ((n - mul + 1) / mul) * mul;
  27 }
  28
  29 }  // namespace cc
  30
  31 #endif  // CC_BASE_UTIL_H_