Replace rtc::cricket::Settable with rtc::Maybe

webrtc/modules/audio_processing/beamformer/array_util.cc

 /*
  *  Copyright (c) 2015 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 50 matching lines @@
   RTC_DCHECK_GT(array_geometry.size(), 1u);
   const Point first_pair_direction =
       PairDirection(array_geometry[0], array_geometry[1]);
   for (size_t i = 2u; i < array_geometry.size(); ++i) {
     const Point pair_direction =
         PairDirection(array_geometry[i - 1], array_geometry[i]);
     if (!AreParallel(first_pair_direction, pair_direction)) {
       return rtc::Maybe<Point>();
     }
   }
-  return first_pair_direction;
+  return rtc::Maybe<Point>(first_pair_direction);
 }
 
 rtc::Maybe<Point> GetNormalIfPlanar(const std::vector<Point>& array_geometry) {
   RTC_DCHECK_GT(array_geometry.size(), 1u);
   const Point first_pair_direction =
       PairDirection(array_geometry[0], array_geometry[1]);
   Point pair_direction(0.f, 0.f, 0.f);
   size_t i = 2u;
   bool is_linear = true;
   for (; i < array_geometry.size() && is_linear; ++i) {
     pair_direction = PairDirection(array_geometry[i - 1], array_geometry[i]);
     if (!AreParallel(first_pair_direction, pair_direction)) {
       is_linear = false;
     }
   }
   if (is_linear) {
     return rtc::Maybe<Point>();
   }
   const Point normal_direction =
       CrossProduct(first_pair_direction, pair_direction);
   for (; i < array_geometry.size(); ++i) {
     pair_direction = PairDirection(array_geometry[i - 1], array_geometry[i]);
     if (!ArePerpendicular(normal_direction, pair_direction)) {
       return rtc::Maybe<Point>();
     }
   }
-  return normal_direction;
+  return rtc::Maybe<Point>(normal_direction);
 }
 
 rtc::Maybe<Point> GetArrayNormalIfExists(
     const std::vector<Point>& array_geometry) {
   const rtc::Maybe<Point> direction = GetDirectionIfLinear(array_geometry);
   if (direction) {
-    return Point(direction->y(), -direction->x(), 0.f);
+    return rtc::Maybe<Point>(Point(direction->y(), -direction->x(), 0.f));
   }
   const rtc::Maybe<Point> normal = GetNormalIfPlanar(array_geometry);
   if (normal && normal->z() < kMaxDotProduct) {
     return normal;
   }
   return rtc::Maybe<Point>();
 }
 
 Point AzimuthToPoint(float azimuth) {
   return Point(std::cos(azimuth), std::sin(azimuth), 0.f);
 }
 
 }  // namespace webrtc