Use constexpr to avoid a static initializer

webrtc/modules/audio_processing/vad/vad_audio_proc.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 15 matching lines @@
 }
 #include "webrtc/modules/include/module_common_types.h"
 
 namespace webrtc {
 
 // The following structures are declared anonymous in iSAC's structs.h. To
 // forward declare them, we use this derived class trick.
 struct VadAudioProc::PitchAnalysisStruct : public ::PitchAnalysisStruct {};
 struct VadAudioProc::PreFiltBankstr : public ::PreFiltBankstr {};
 
-static const float kFrequencyResolution =
+static constexpr float kFrequencyResolution =
     kSampleRateHz / static_cast<float>(VadAudioProc::kDftSize);
-static const int kSilenceRms = 5;
+static constexpr int kSilenceRms = 5;
 
 // TODO(turajs): Make a Create or Init for VadAudioProc.
 VadAudioProc::VadAudioProc()
     : audio_buffer_(),
       num_buffer_samples_(kNumPastSignalSamples),
       log_old_gain_(-2),
       old_lag_(50),  // Arbitrary but valid as pitch-lag (in samples).
       pitch_analysis_handle_(new PitchAnalysisStruct),
       pre_filter_handle_(new PreFiltBankstr),
       high_pass_filter_(PoleZeroFilter::Create(kCoeffNumerator,
@@ skipping 218 matching lines @@
   size_t offset = kNumPastSignalSamples;
   for (size_t i = 0; i < kNum10msSubframes; i++) {
     rms[i] = 0;
     for (size_t n = 0; n < kNumSubframeSamples; n++, offset++)
       rms[i] += audio_buffer_[offset] * audio_buffer_[offset];
     rms[i] = sqrt(rms[i] / kNumSubframeSamples);
   }
 }
 
 }  // namespace webrtc