Use overloaded operators with QuicTime for addition, subtraction and scalar

net/quic/congestion_control/pacing_sender.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/congestion_control/pacing_sender.h"
 
 #include "net/quic/quic_flags.h"
 
 using std::min;
 
@@ skipping 73 matching lines @@
     ideal_next_packet_send_time_ = QuicTime::Zero();
     return in_flight;
   }
   // The next packet should be sent as soon as the current packet has been
   // transferred.  PacingRate is based on bytes in flight including this packet.
   QuicTime::Delta delay =
       PacingRate(bytes_in_flight + bytes).TransferTime(bytes);
   // If the last send was delayed, and the alarm took a long time to get
   // invoked, allow the connection to make up for lost time.
   if (was_last_send_delayed_) {
-    ideal_next_packet_send_time_ = ideal_next_packet_send_time_.Add(delay);
+    ideal_next_packet_send_time_ = ideal_next_packet_send_time_ + delay;
     // The send was application limited if it takes longer than the
     // pacing delay between sent packets.
     const bool application_limited =
         last_delayed_packet_sent_time_.IsInitialized() &&
-        sent_time > last_delayed_packet_sent_time_.Add(delay);
+        sent_time > last_delayed_packet_sent_time_ + delay;
     const bool making_up_for_lost_time =
         ideal_next_packet_send_time_ <= sent_time;
     // As long as we're making up time and not application limited,
     // continue to consider the packets delayed, allowing the packets to be
     // sent immediately.
     if (making_up_for_lost_time && !application_limited) {
       last_delayed_packet_sent_time_ = sent_time;
     } else {
       was_last_send_delayed_ = false;
       last_delayed_packet_sent_time_ = QuicTime::Zero();
     }
   } else {
-    ideal_next_packet_send_time_ = QuicTime::Max(
-        ideal_next_packet_send_time_.Add(delay), sent_time.Add(delay));
+    ideal_next_packet_send_time_ =
+        QuicTime::Max(ideal_next_packet_send_time_ + delay, sent_time + delay);
   }
   return in_flight;
 }
 
 void PacingSender::OnRetransmissionTimeout(bool packets_retransmitted) {
   sender_->OnRetransmissionTimeout(packets_retransmitted);
 }
 
 void PacingSender::OnConnectionMigration() {
   sender_->OnConnectionMigration();
 }
 
 QuicTime::Delta PacingSender::TimeUntilSend(
     QuicTime now,
     QuicByteCount bytes_in_flight) const {
   QuicTime::Delta time_until_send =
       sender_->TimeUntilSend(now, bytes_in_flight);
   if (burst_tokens_ > 0 || bytes_in_flight == 0) {
     // Don't pace if we have burst tokens available or leaving quiescence.
     return time_until_send;
   }
 
   if (!time_until_send.IsZero()) {
     DCHECK(time_until_send.IsInfinite());
     // The underlying sender prevents sending.
     return time_until_send;
   }
 
   // If the next send time is within the alarm granularity, send immediately.
-  if (ideal_next_packet_send_time_ > now.Add(alarm_granularity_)) {
+  if (ideal_next_packet_send_time_ > now + alarm_granularity_) {
     DVLOG(1) << "Delaying packet: "
-             << ideal_next_packet_send_time_.Subtract(now).ToMicroseconds();
+             << (ideal_next_packet_send_time_ - now).ToMicroseconds();
     was_last_send_delayed_ = true;
-    return ideal_next_packet_send_time_.Subtract(now);
+    return ideal_next_packet_send_time_ - now;
   }
 
   DVLOG(1) << "Sending packet now";
   return QuicTime::Delta::Zero();
 }
 
 QuicBandwidth PacingSender::PacingRate(QuicByteCount bytes_in_flight) const {
   if (!max_pacing_rate_.IsZero()) {
     return QuicBandwidth::FromBitsPerSecond(
         min(max_pacing_rate_.ToBitsPerSecond(),
@@ skipping 24 matching lines @@
 
 QuicByteCount PacingSender::GetSlowStartThreshold() const {
   return sender_->GetSlowStartThreshold();
 }
 
 CongestionControlType PacingSender::GetCongestionControlType() const {
   return sender_->GetCongestionControlType();
 }
 
 }  // namespace net