Move webrtc/{base => rtc_base}

webrtc/base/mod_ops.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_BASE_MOD_OPS_H_
 #define WEBRTC_BASE_MOD_OPS_H_
 
-#include <limits>
-#include <type_traits>
 
-#include "webrtc/base/checks.h"
-
-namespace webrtc {
-
-template <unsigned long M>                                    // NOLINT
-inline unsigned long Add(unsigned long a, unsigned long b) {  // NOLINT
-  RTC_DCHECK_LT(a, M);
-  unsigned long t = M - b % M;  // NOLINT
-  unsigned long res = a - t;    // NOLINT
-  if (t > a)
-    return res + M;
-  return res;
-}
-
-template <unsigned long M>                                         // NOLINT
-inline unsigned long Subtract(unsigned long a, unsigned long b) {  // NOLINT
-  RTC_DCHECK_LT(a, M);
-  unsigned long sub = b % M;  // NOLINT
-  if (a < sub)
-    return M - (sub - a);
-  return a - sub;
-}
-
-// Calculates the forward difference between two wrapping numbers.
-//
-// Example:
-// uint8_t x = 253;
-// uint8_t y = 2;
-//
-// ForwardDiff(x, y) == 5
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-//          |----->----->----->----->----->
-//
-// ForwardDiff(y, x) == 251
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-// -->----->                              |----->---
-//
-template <typename T, T M>
-inline T ForwardDiff(T a, T b) {
-  static_assert(std::is_unsigned<T>::value,
-                "Type must be an unsigned integer.");
-  RTC_DCHECK_LT(a, M);
-  RTC_DCHECK_LT(b, M);
-  return a <= b ? b - a : M - (a - b);
-}
-
-template <typename T>
-inline T ForwardDiff(T a, T b) {
-  static_assert(std::is_unsigned<T>::value,
-                "Type must be an unsigned integer.");
-  return b - a;
-}
-
-// Calculates the reverse difference between two wrapping numbers.
-//
-// Example:
-// uint8_t x = 253;
-// uint8_t y = 2;
-//
-// ReverseDiff(y, x) == 5
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-//          <-----<-----<-----<-----<-----|
-//
-// ReverseDiff(x, y) == 251
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-// ---<-----|                             |<-----<--
-//
-template <typename T, T M>
-inline T ReverseDiff(T a, T b) {
-  static_assert(std::is_unsigned<T>::value,
-                "Type must be an unsigned integer.");
-  RTC_DCHECK_LT(a, M);
-  RTC_DCHECK_LT(b, M);
-  return b <= a ? a - b : M - (b - a);
-}
-
-template <typename T>
-inline T ReverseDiff(T a, T b) {
-  static_assert(std::is_unsigned<T>::value,
-                "Type must be an unsigned integer.");
-  return a - b;
-}
-
-// Calculates the minimum distance between to wrapping numbers.
-//
-// The minimum distance is defined as min(ForwardDiff(a, b), ReverseDiff(a, b))
-template <typename T, T M>
-inline T MinDiff(T a, T b) {
-  static_assert(std::is_unsigned<T>::value,
-                "Type must be an unsigned integer.");
-  return std::min(ForwardDiff<T, M>(a, b), ReverseDiff<T, M>(a, b));
-}
-
-template <typename T>
-inline T MinDiff(T a, T b) {
-  static_assert(std::is_unsigned<T>::value,
-                "Type must be an unsigned integer.");
-  return std::min(ForwardDiff(a, b), ReverseDiff(a, b));
-}
-
-}  // namespace webrtc
+// This header is deprecated and is just left here temporarily during
+// refactoring. See https://bugs.webrtc.org/7634 for more details.
+#include "webrtc/rtc_base/mod_ops.h"
 
 #endif  // WEBRTC_BASE_MOD_OPS_H_