Use overloaded operators with QuicTime for addition, subtraction and scalar

net/quic/quic_sent_packet_manager.cc

 // Copyright 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/quic_sent_packet_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 746 matching lines @@
   // packet numbers will include the ACK aggregation delay.
   const TransmissionInfo& transmission_info =
       unacked_packets_.GetTransmissionInfo(ack_frame.largest_observed);
   // Ensure the packet has a valid sent time.
   if (transmission_info.sent_time == QuicTime::Zero()) {
     QUIC_BUG << "Acked packet has zero sent time, largest_observed:"
              << ack_frame.largest_observed;
     return false;
   }
 
-  QuicTime::Delta send_delta =
-      ack_receive_time.Subtract(transmission_info.sent_time);
+  QuicTime::Delta send_delta = ack_receive_time - transmission_info.sent_time;
   const int kMaxSendDeltaSeconds = 30;
   if (FLAGS_quic_socket_walltimestamps &&
       send_delta.ToSeconds() > kMaxSendDeltaSeconds) {
     // send_delta can be very high if local clock is changed mid-connection.
     LOG(WARNING) << "Excessive send delta: " << send_delta.ToSeconds()
                  << ", setting to: " << kMaxSendDeltaSeconds;
     send_delta = QuicTime::Delta::FromSeconds(kMaxSendDeltaSeconds);
   }
   rtt_stats_.UpdateRtt(send_delta, ack_frame.ack_delay_time, ack_receive_time);
 
@@ skipping 21 matching lines @@
 
 const QuicTime QuicSentPacketManager::GetRetransmissionTime() const {
   // Don't set the timer if there are no packets in flight or we've already
   // queued a tlp transmission and it hasn't been sent yet.
   if (!unacked_packets_.HasInFlightPackets() ||
       pending_timer_transmission_count_ > 0) {
     return QuicTime::Zero();
   }
   switch (GetRetransmissionMode()) {
     case HANDSHAKE_MODE:
-      return clock_->ApproximateNow().Add(GetCryptoRetransmissionDelay());
+      return clock_->ApproximateNow() + GetCryptoRetransmissionDelay();
     case LOSS_MODE:
       return loss_algorithm_->GetLossTimeout();
     case TLP_MODE: {
       // TODO(ianswett): When CWND is available, it would be preferable to
       // set the timer based on the earliest retransmittable packet.
       // Base the updated timer on the send time of the last packet.
       const QuicTime sent_time = unacked_packets_.GetLastPacketSentTime();
-      const QuicTime tlp_time = sent_time.Add(GetTailLossProbeDelay());
+      const QuicTime tlp_time = sent_time + GetTailLossProbeDelay();
       // Ensure the TLP timer never gets set to a time in the past.
       return QuicTime::Max(clock_->ApproximateNow(), tlp_time);
     }
     case RTO_MODE: {
       // The RTO is based on the first outstanding packet.
       const QuicTime sent_time = unacked_packets_.GetLastPacketSentTime();
-      QuicTime rto_time = sent_time.Add(GetRetransmissionDelay());
+      QuicTime rto_time = sent_time + GetRetransmissionDelay();
       // Wait for TLP packets to be acked before an RTO fires.
       QuicTime tlp_time =
-          unacked_packets_.GetLastPacketSentTime().Add(GetTailLossProbeDelay());
+          unacked_packets_.GetLastPacketSentTime() + GetTailLossProbeDelay();
       return QuicTime::Max(tlp_time, rto_time);
     }
   }
   DCHECK(false);
   return QuicTime::Zero();
 }
 
 const QuicTime::Delta QuicSentPacketManager::GetCryptoRetransmissionDelay()
     const {
   // This is equivalent to the TailLossProbeDelay, but slightly more aggressive
@@ skipping 12 matching lines @@
   QuicTime::Delta srtt = rtt_stats_.smoothed_rtt();
   if (srtt.IsZero()) {
     srtt = QuicTime::Delta::FromMicroseconds(rtt_stats_.initial_rtt_us());
   }
   if (enable_half_rtt_tail_loss_probe_ && consecutive_tlp_count_ == 0u) {
     return QuicTime::Delta::FromMilliseconds(
         max(kMinTailLossProbeTimeoutMs,
             static_cast<int64_t>(0.5 * srtt.ToMilliseconds())));
   }
   if (!unacked_packets_.HasMultipleInFlightPackets()) {
-    return QuicTime::Delta::Max(
-        srtt.Multiply(2),
-        srtt.Multiply(1.5).Add(
-            QuicTime::Delta::FromMilliseconds(kMinRetransmissionTimeMs / 2)));
+    return QuicTime::Delta::Max(2 * srtt,
+                                1.5 * srtt + QuicTime::Delta::FromMilliseconds(
+                                                 kMinRetransmissionTimeMs / 2));
   }
   return QuicTime::Delta::FromMilliseconds(
       max(kMinTailLossProbeTimeoutMs,
           static_cast<int64_t>(2 * srtt.ToMilliseconds())));
 }
 
 const QuicTime::Delta QuicSentPacketManager::GetRetransmissionDelay() const {
   QuicTime::Delta retransmission_delay = send_algorithm_->RetransmissionDelay();
   if (retransmission_delay.IsZero()) {
     // We are in the initial state, use default timeout values.
     retransmission_delay =
         QuicTime::Delta::FromMilliseconds(kDefaultRetransmissionTimeMs);
   } else if (retransmission_delay.ToMilliseconds() < kMinRetransmissionTimeMs) {
     retransmission_delay =
         QuicTime::Delta::FromMilliseconds(kMinRetransmissionTimeMs);
   }
 
   // Calculate exponential back off.
-  retransmission_delay = retransmission_delay.Multiply(
-      1 << min<size_t>(consecutive_rto_count_, kMaxRetransmissions));
+  retransmission_delay =
+      retransmission_delay *
+      (1 << min<size_t>(consecutive_rto_count_, kMaxRetransmissions));
 
   if (retransmission_delay.ToMilliseconds() > kMaxRetransmissionTimeMs) {
     return QuicTime::Delta::FromMilliseconds(kMaxRetransmissionTimeMs);
   }
   return retransmission_delay;
 }
 
 const RttStats* QuicSentPacketManager::GetRttStats() const {
   return &rtt_stats_;
 }
@@ skipping 113 matching lines @@
 TransmissionInfo* QuicSentPacketManager::GetMutableTransmissionInfo(
     QuicPacketNumber packet_number) {
   return unacked_packets_.GetMutableTransmissionInfo(packet_number);
 }
 
 void QuicSentPacketManager::RemoveObsoletePackets() {
   unacked_packets_.RemoveObsoletePackets();
 }
 
 }  // namespace net