Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 580 insertions, 0 deletions

diff --git a/third_party/libwebrtc/api/stats/rtc_stats.h b/third_party/libwebrtc/api/stats/rtc_stats.h
new file mode 100644
index 0000000000..72775243c7
--- /dev/null
+++ b/third_party/libwebrtc/api/stats/rtc_stats.h
@@ -0,0 +1,580 @@
+/*
+ *  Copyright 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 API_STATS_RTC_STATS_H_
+#define API_STATS_RTC_STATS_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <map>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/units/timestamp.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/system/rtc_export.h"
+#include "rtc_base/system/rtc_export_template.h"
+
+namespace webrtc {
+
+class RTCStatsMemberInterface;
+
+// Abstract base class for RTCStats-derived dictionaries, see
+// https://w3c.github.io/webrtc-stats/.
+//
+// All derived classes must have the following static variable defined:
+//   static const char kType[];
+// It is used as a unique class identifier and a string representation of the
+// class type, see https://w3c.github.io/webrtc-stats/#rtcstatstype-str*.
+// Use the `WEBRTC_RTCSTATS_IMPL` macro when implementing subclasses, see macro
+// for details.
+//
+// Derived classes list their dictionary members, RTCStatsMember<T>, as public
+// fields, allowing the following:
+//
+// RTCFooStats foo("fooId", Timestamp::Micros(GetCurrentTime()));
+// foo.bar = 42;
+// foo.baz = std::vector<std::string>();
+// foo.baz->push_back("hello world");
+// uint32_t x = *foo.bar;
+//
+// Pointers to all the members are available with `Members`, allowing iteration:
+//
+// for (const RTCStatsMemberInterface* member : foo.Members()) {
+//   printf("%s = %s\n", member->name(), member->ValueToString().c_str());
+// }
+class RTC_EXPORT RTCStats {
+ public:
+  RTCStats(const std::string& id, Timestamp timestamp)
+      : id_(id), timestamp_(timestamp) {}
+  ABSL_DEPRECATED("Use constructor with Timestamp instead")
+  RTCStats(std::string id, int64_t timestamp_us)
+      : RTCStats(std::move(id), Timestamp::Micros(timestamp_us)) {}
+
+  virtual ~RTCStats() {}
+
+  virtual std::unique_ptr<RTCStats> copy() const = 0;
+
+  const std::string& id() const { return id_; }
+  // Time relative to the UNIX epoch (Jan 1, 1970, UTC), in microseconds.
+  ABSL_DEPRECATED("Use .timestamp().us() instead")
+  int64_t timestamp_us() const { return timestamp_.us(); }
+  Timestamp timestamp() const { return timestamp_; }
+
+  // Returns the static member variable `kType` of the implementing class.
+  virtual const char* type() const = 0;
+  // Returns a vector of pointers to all the `RTCStatsMemberInterface` members
+  // of this class. This allows for iteration of members. For a given class,
+  // `Members` always returns the same members in the same order.
+  std::vector<const RTCStatsMemberInterface*> Members() const;
+  // Checks if the two stats objects are of the same type and have the same
+  // member values. Timestamps are not compared. These operators are exposed for
+  // testing.
+  bool operator==(const RTCStats& other) const;
+  bool operator!=(const RTCStats& other) const;
+
+  // Creates a JSON readable string representation of the stats
+  // object, listing all of its members (names and values).
+  std::string ToJson() const;
+
+  // Downcasts the stats object to an `RTCStats` subclass `T`. DCHECKs that the
+  // object is of type `T`.
+  template <typename T>
+  const T& cast_to() const {
+    RTC_DCHECK_EQ(type(), T::kType);
+    return static_cast<const T&>(*this);
+  }
+
+ protected:
+  // Gets a vector of all members of this `RTCStats` object, including members
+  // derived from parent classes. `additional_capacity` is how many more members
+  // shall be reserved in the vector (so that subclasses can allocate a vector
+  // with room for both parent and child members without it having to resize).
+  virtual std::vector<const RTCStatsMemberInterface*>
+  MembersOfThisObjectAndAncestors(size_t additional_capacity) const;
+
+  std::string const id_;
+  Timestamp timestamp_;
+};
+
+// All `RTCStats` classes should use these macros.
+// `WEBRTC_RTCSTATS_DECL` is placed in a public section of the class definition.
+// `WEBRTC_RTCSTATS_IMPL` is placed outside the class definition (in a .cc).
+//
+// These macros declare (in _DECL) and define (in _IMPL) the static `kType` and
+// overrides methods as required by subclasses of `RTCStats`: `copy`, `type` and
+// `MembersOfThisObjectAndAncestors`. The |...| argument is a list of addresses
+// to each member defined in the implementing class. The list must have at least
+// one member.
+//
+// (Since class names need to be known to implement these methods this cannot be
+// part of the base `RTCStats`. While these methods could be implemented using
+// templates, that would only work for immediate subclasses. Subclasses of
+// subclasses also have to override these methods, resulting in boilerplate
+// code. Using a macro avoids this and works for any `RTCStats` class, including
+// grandchildren.)
+//
+// Sample usage:
+//
+// rtcfoostats.h:
+//   class RTCFooStats : public RTCStats {
+//    public:
+//     WEBRTC_RTCSTATS_DECL();
+//
+//     RTCFooStats(const std::string& id, int64_t timestamp_us);
+//
+//     RTCStatsMember<int32_t> foo;
+//     RTCStatsMember<int32_t> bar;
+//   };
+//
+// rtcfoostats.cc:
+//   WEBRTC_RTCSTATS_IMPL(RTCFooStats, RTCStats, "foo-stats"
+//       &foo,
+//       &bar);
+//
+//   RTCFooStats::RTCFooStats(const std::string& id, int64_t timestamp_us)
+//       : RTCStats(id, timestamp_us),
+//         foo("foo"),
+//         bar("bar") {
+//   }
+//
+#define WEBRTC_RTCSTATS_DECL()                                          \
+ protected:                                                             \
+  std::vector<const webrtc::RTCStatsMemberInterface*>                   \
+  MembersOfThisObjectAndAncestors(size_t local_var_additional_capacity) \
+      const override;                                                   \
+                                                                        \
+ public:                                                                \
+  static const char kType[];                                            \
+                                                                        \
+  std::unique_ptr<webrtc::RTCStats> copy() const override;              \
+  const char* type() const override
+
+#define WEBRTC_RTCSTATS_IMPL(this_class, parent_class, type_str, ...)          \
+  const char this_class::kType[] = type_str;                                   \
+                                                                               \
+  std::unique_ptr<webrtc::RTCStats> this_class::copy() const {                 \
+    return std::make_unique<this_class>(*this);                                \
+  }                                                                            \
+                                                                               \
+  const char* this_class::type() const { return this_class::kType; }           \
+                                                                               \
+  std::vector<const webrtc::RTCStatsMemberInterface*>                          \
+  this_class::MembersOfThisObjectAndAncestors(                                 \
+      size_t local_var_additional_capacity) const {                            \
+    const webrtc::RTCStatsMemberInterface* local_var_members[] = {             \
+        __VA_ARGS__};                                                          \
+    size_t local_var_members_count =                                           \
+        sizeof(local_var_members) / sizeof(local_var_members[0]);              \
+    std::vector<const webrtc::RTCStatsMemberInterface*>                        \
+        local_var_members_vec = parent_class::MembersOfThisObjectAndAncestors( \
+            local_var_members_count + local_var_additional_capacity);          \
+    RTC_DCHECK_GE(                                                             \
+        local_var_members_vec.capacity() - local_var_members_vec.size(),       \
+        local_var_members_count + local_var_additional_capacity);              \
+    local_var_members_vec.insert(local_var_members_vec.end(),                  \
+                                 &local_var_members[0],                        \
+                                 &local_var_members[local_var_members_count]); \
+    return local_var_members_vec;                                              \
+  }
+
+// A version of WEBRTC_RTCSTATS_IMPL() where "..." is omitted, used to avoid a
+// compile error on windows. This is used if the stats dictionary does not
+// declare any members of its own (but perhaps its parent dictionary does).
+#define WEBRTC_RTCSTATS_IMPL_NO_MEMBERS(this_class, parent_class, type_str) \
+  const char this_class::kType[] = type_str;                                \
+                                                                            \
+  std::unique_ptr<webrtc::RTCStats> this_class::copy() const {              \
+    return std::make_unique<this_class>(*this);                             \
+  }                                                                         \
+                                                                            \
+  const char* this_class::type() const { return this_class::kType; }        \
+                                                                            \
+  std::vector<const webrtc::RTCStatsMemberInterface*>                       \
+  this_class::MembersOfThisObjectAndAncestors(                              \
+      size_t local_var_additional_capacity) const {                         \
+    return parent_class::MembersOfThisObjectAndAncestors(0);                \
+  }
+
+// Non-standard stats members can be exposed to the JavaScript API in Chrome
+// e.g. through origin trials. The group ID can be used by the blink layer to
+// determine if a stats member should be exposed or not. Multiple non-standard
+// stats members can share the same group ID so that they are exposed together.
+enum class NonStandardGroupId {
+  // Group ID used for testing purposes only.
+  kGroupIdForTesting,
+  // I2E:
+  // https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/hE2B1iItPDk
+  kRtcAudioJitterBufferMaxPackets,
+  // I2E:
+  // https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/YbhMyqLXXXo
+  kRtcStatsRelativePacketArrivalDelay,
+};
+
+// Certain stat members should only be exposed to the JavaScript API in
+// certain circumstances as to avoid passive fingerprinting.
+enum class StatExposureCriteria : uint8_t {
+  // The stat should always be exposed. This is the default.
+  kAlways,
+  // The stat exposes hardware capabilities and thus should has limited exposure
+  // to JavaScript. The requirements for exposure are written in the spec at
+  // https://w3c.github.io/webrtc-stats/#limiting-exposure-of-hardware-capabilities.
+  kHardwareCapability,
+  // The stat is non-standard so user agents should filter these.
+  kNonStandard,
+};
+
+// Interface for `RTCStats` members, which have a name and a value of a type
+// defined in a subclass. Only the types listed in `Type` are supported, these
+// are implemented by `RTCStatsMember<T>`. The value of a member may be
+// undefined, the value can only be read if `is_defined`.
+class RTCStatsMemberInterface {
+ public:
+  // Member value types.
+  enum Type {
+    kBool,    // bool
+    kInt32,   // int32_t
+    kUint32,  // uint32_t
+    kInt64,   // int64_t
+    kUint64,  // uint64_t
+    kDouble,  // double
+    kString,  // std::string
+
+    kSequenceBool,    // std::vector<bool>
+    kSequenceInt32,   // std::vector<int32_t>
+    kSequenceUint32,  // std::vector<uint32_t>
+    kSequenceInt64,   // std::vector<int64_t>
+    kSequenceUint64,  // std::vector<uint64_t>
+    kSequenceDouble,  // std::vector<double>
+    kSequenceString,  // std::vector<std::string>
+
+    kMapStringUint64,  // std::map<std::string, uint64_t>
+    kMapStringDouble,  // std::map<std::string, double>
+  };
+
+  virtual ~RTCStatsMemberInterface() {}
+
+  const char* name() const { return name_; }
+  virtual Type type() const = 0;
+  virtual bool is_sequence() const = 0;
+  virtual bool is_string() const = 0;
+  virtual bool is_defined() const = 0;
+  // Is this part of the stats spec? Used so that chromium can easily filter
+  // out anything unstandardized.
+  bool is_standardized() const {
+    return exposure_criteria() != StatExposureCriteria::kNonStandard;
+  }
+  // Non-standard stats members can have group IDs in order to be exposed in
+  // JavaScript through experiments. Standardized stats have no group IDs.
+  virtual std::vector<NonStandardGroupId> group_ids() const { return {}; }
+  // The conditions for exposing the statistic to JavaScript. Stats with
+  // criteria that is not kAlways has some restriction and should be filtered
+  // in accordance to the spec.
+  virtual StatExposureCriteria exposure_criteria() const {
+    return StatExposureCriteria::kAlways;
+  }
+  // Type and value comparator. The names are not compared. These operators are
+  // exposed for testing.
+  bool operator==(const RTCStatsMemberInterface& other) const {
+    return IsEqual(other);
+  }
+  bool operator!=(const RTCStatsMemberInterface& other) const {
+    return !(*this == other);
+  }
+  virtual std::string ValueToString() const = 0;
+  // This is the same as ValueToString except for kInt64 and kUint64 types,
+  // where the value is represented as a double instead of as an integer.
+  // Since JSON stores numbers as floating point numbers, very large integers
+  // cannot be accurately represented, so we prefer to display them as doubles
+  // instead.
+  virtual std::string ValueToJson() const = 0;
+
+  template <typename T>
+  const T& cast_to() const {
+    RTC_DCHECK_EQ(type(), T::StaticType());
+    return static_cast<const T&>(*this);
+  }
+
+ protected:
+  explicit RTCStatsMemberInterface(const char* name) : name_(name) {}
+
+  virtual bool IsEqual(const RTCStatsMemberInterface& other) const = 0;
+
+  const char* const name_;
+};
+
+// Template implementation of `RTCStatsMemberInterface`.
+// The supported types are the ones described by
+// `RTCStatsMemberInterface::Type`.
+template <typename T>
+class RTCStatsMember : public RTCStatsMemberInterface {
+ public:
+  explicit RTCStatsMember(const char* name)
+      : RTCStatsMemberInterface(name), value_() {}
+  RTCStatsMember(const char* name, const T& value)
+      : RTCStatsMemberInterface(name), value_(value) {}
+  RTCStatsMember(const char* name, T&& value)
+      : RTCStatsMemberInterface(name), value_(std::move(value)) {}
+  explicit RTCStatsMember(const RTCStatsMember<T>& other)
+      : RTCStatsMemberInterface(other.name_), value_(other.value_) {}
+  explicit RTCStatsMember(RTCStatsMember<T>&& other)
+      : RTCStatsMemberInterface(other.name_), value_(std::move(other.value_)) {}
+
+  static Type StaticType();
+  Type type() const override { return StaticType(); }
+  bool is_sequence() const override;
+  bool is_string() const override;
+  bool is_defined() const override { return value_.has_value(); }
+  std::string ValueToString() const override;
+  std::string ValueToJson() const override;
+
+  template <typename U>
+  inline T ValueOrDefault(U default_value) const {
+    return value_.value_or(default_value);
+  }
+
+  // Assignment operators.
+  T& operator=(const T& value) {
+    value_ = value;
+    return value_.value();
+  }
+  T& operator=(const T&& value) {
+    value_ = std::move(value);
+    return value_.value();
+  }
+
+  // Value getters.
+  T& operator*() {
+    RTC_DCHECK(value_);
+    return *value_;
+  }
+  const T& operator*() const {
+    RTC_DCHECK(value_);
+    return *value_;
+  }
+
+  // Value getters, arrow operator.
+  T* operator->() {
+    RTC_DCHECK(value_);
+    return &(*value_);
+  }
+  const T* operator->() const {
+    RTC_DCHECK(value_);
+    return &(*value_);
+  }
+
+ protected:
+  bool IsEqual(const RTCStatsMemberInterface& other) const override {
+    if (type() != other.type() ||
+        is_standardized() != other.is_standardized() ||
+        exposure_criteria() != other.exposure_criteria())
+      return false;
+    const RTCStatsMember<T>& other_t =
+        static_cast<const RTCStatsMember<T>&>(other);
+    return value_ == other_t.value_;
+  }
+
+ private:
+  absl::optional<T> value_;
+};
+
+namespace rtc_stats_internal {
+
+typedef std::map<std::string, uint64_t> MapStringUint64;
+typedef std::map<std::string, double> MapStringDouble;
+
+}  // namespace rtc_stats_internal
+
+#define WEBRTC_DECLARE_RTCSTATSMEMBER(T)                                    \
+  template <>                                                               \
+  RTC_EXPORT RTCStatsMemberInterface::Type RTCStatsMember<T>::StaticType(); \
+  template <>                                                               \
+  RTC_EXPORT bool RTCStatsMember<T>::is_sequence() const;                   \
+  template <>                                                               \
+  RTC_EXPORT bool RTCStatsMember<T>::is_string() const;                     \
+  template <>                                                               \
+  RTC_EXPORT std::string RTCStatsMember<T>::ValueToString() const;          \
+  template <>                                                               \
+  RTC_EXPORT std::string RTCStatsMember<T>::ValueToJson() const;            \
+  extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)             \
+      RTCStatsMember<T>
+
+WEBRTC_DECLARE_RTCSTATSMEMBER(bool);
+WEBRTC_DECLARE_RTCSTATSMEMBER(int32_t);
+WEBRTC_DECLARE_RTCSTATSMEMBER(uint32_t);
+WEBRTC_DECLARE_RTCSTATSMEMBER(int64_t);
+WEBRTC_DECLARE_RTCSTATSMEMBER(uint64_t);
+WEBRTC_DECLARE_RTCSTATSMEMBER(double);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::string);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::vector<bool>);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::vector<int32_t>);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::vector<uint32_t>);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::vector<int64_t>);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::vector<uint64_t>);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::vector<double>);
+WEBRTC_DECLARE_RTCSTATSMEMBER(std::vector<std::string>);
+WEBRTC_DECLARE_RTCSTATSMEMBER(rtc_stats_internal::MapStringUint64);
+WEBRTC_DECLARE_RTCSTATSMEMBER(rtc_stats_internal::MapStringDouble);
+
+// For stats with restricted exposure.
+template <typename T, StatExposureCriteria E>
+class RTCRestrictedStatsMember : public RTCStatsMember<T> {
+ public:
+  explicit RTCRestrictedStatsMember(const char* name)
+      : RTCStatsMember<T>(name) {}
+  RTCRestrictedStatsMember(const char* name, const T& value)
+      : RTCStatsMember<T>(name, value) {}
+  RTCRestrictedStatsMember(const char* name, T&& value)
+      : RTCStatsMember<T>(name, std::move(value)) {}
+  RTCRestrictedStatsMember(const RTCRestrictedStatsMember<T, E>& other)
+      : RTCStatsMember<T>(other) {}
+  RTCRestrictedStatsMember(RTCRestrictedStatsMember<T, E>&& other)
+      : RTCStatsMember<T>(std::move(other)) {}
+
+  StatExposureCriteria exposure_criteria() const override { return E; }
+
+  T& operator=(const T& value) { return RTCStatsMember<T>::operator=(value); }
+  T& operator=(const T&& value) {
+    return RTCStatsMember<T>::operator=(std::move(value));
+  }
+
+ private:
+  static_assert(E != StatExposureCriteria::kAlways,
+                "kAlways is the default exposure criteria. Use "
+                "RTCStatMember<T> instead.");
+};
+
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<bool, StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<int32_t,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<uint32_t,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<int64_t,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<uint64_t,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<double, StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::string,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::vector<bool>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::vector<int32_t>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::vector<uint32_t>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::vector<int64_t>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::vector<uint64_t>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::vector<double>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::vector<std::string>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::map<std::string, uint64_t>,
+                             StatExposureCriteria::kHardwareCapability>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCRestrictedStatsMember<std::map<std::string, double>,
+                             StatExposureCriteria::kHardwareCapability>;
+
+// Using inheritance just so that it's obvious from the member's declaration
+// whether it's standardized or not.
+template <typename T>
+class RTCNonStandardStatsMember
+    : public RTCRestrictedStatsMember<T, StatExposureCriteria::kNonStandard> {
+ public:
+  explicit RTCNonStandardStatsMember(const char* name)
+      : RTCRestrictedStatsBase(name) {}
+  RTCNonStandardStatsMember(const char* name,
+                            std::initializer_list<NonStandardGroupId> group_ids)
+      : RTCRestrictedStatsBase(name), group_ids_(group_ids) {}
+  RTCNonStandardStatsMember(const char* name, const T& value)
+      : RTCRestrictedStatsBase(name, value) {}
+  RTCNonStandardStatsMember(const char* name, T&& value)
+      : RTCRestrictedStatsBase(name, std::move(value)) {}
+  RTCNonStandardStatsMember(const RTCNonStandardStatsMember<T>& other)
+      : RTCRestrictedStatsBase(other), group_ids_(other.group_ids_) {}
+  RTCNonStandardStatsMember(RTCNonStandardStatsMember<T>&& other)
+      : RTCRestrictedStatsBase(std::move(other)),
+        group_ids_(std::move(other.group_ids_)) {}
+
+  std::vector<NonStandardGroupId> group_ids() const override {
+    return group_ids_;
+  }
+
+  T& operator=(const T& value) {
+    return RTCRestrictedStatsMember<
+        T, StatExposureCriteria::kNonStandard>::operator=(value);
+  }
+  T& operator=(const T&& value) {
+    return RTCRestrictedStatsMember<
+        T, StatExposureCriteria::kNonStandard>::operator=(std::move(value));
+  }
+
+ private:
+  using RTCRestrictedStatsBase =
+      RTCRestrictedStatsMember<T, StatExposureCriteria::kNonStandard>;
+  std::vector<NonStandardGroupId> group_ids_;
+};
+
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<bool>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<int32_t>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<uint32_t>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<int64_t>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<uint64_t>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<double>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::string>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::vector<bool>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::vector<int32_t>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::vector<uint32_t>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::vector<int64_t>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::vector<uint64_t>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::vector<double>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::vector<std::string>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::map<std::string, uint64_t>>;
+extern template class RTC_EXPORT_TEMPLATE_DECLARE(RTC_EXPORT)
+    RTCNonStandardStatsMember<std::map<std::string, double>>;
+
+}  // namespace webrtc
+
+#endif  // API_STATS_RTC_STATS_H_