Roll forward to cl/338482889

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I9850950db8bd84f0904ea1a413151887f52098cf

cpp/platform/impl/ios/atomic_reference.h

@@ -0,0 +1,33 @@
+#ifndef PLATFORM_IMPL_IOS_ATOMIC_REFERENCE_H_
+#define PLATFORM_IMPL_IOS_ATOMIC_REFERENCE_H_
+
+#include <atomic>
+#include <cstdint>
+
+#include "platform/api/atomic_reference.h"
+
+namespace location {
+namespace nearby {
+namespace ios {
+
+class AtomicUint32 : public api::AtomicUint32 {
+ public:
+  explicit AtomicUint32(std::int32_t value) : value_(value) {}
+  ~AtomicUint32() override = default;
+
+  std::uint32_t Get() const override {
+    return value_;
+  }
+  void Set(std::uint32_t value) override {
+    value_ = value;
+  }
+
+ private:
+  std::atomic<std::uint32_t> value_;
+};
+
+}  // namespace ios
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_IOS_ATOMIC_REFERENCE_H_