git subrepo clone (merge) https://github.com/free-audio/clap-helpers.git deps/clap-juce-extensions/clap-libs/clap-helpers

subrepo:
  subdir:   "deps/clap-juce-extensions/clap-libs/clap-helpers"
  merged:   "2bb43c187"
upstream:
  origin:   "https://github.com/free-audio/clap-helpers.git"
  branch:   "main"
  commit:   "2bb43c187"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"

deps/clap-juce-extensions/clap-libs/clap-helpers/include/clap/helpers/param-queue.hh

@@ -0,0 +1,71 @@
+#pragma once
+
+#include <array>
+#include <atomic>
+#include <cassert>
+#include <cstddef>
+
+namespace clap { namespace helpers {
+   template <typename T, size_t CAPACITY>
+   class ParamQueue {
+   public:
+      using value_type = T;
+
+      ParamQueue() = default;
+
+      void push(const T &value) {
+         while (!tryPush(value))
+            ;
+      }
+
+      bool tryPush(const T &value) {
+         int w = _writeOffset;        // write element
+         int wn = (w + 1) % CAPACITY; // next write element
+
+         if (wn == _readOffset)
+            return false;
+
+         _data[w] = value;
+         _writeOffset = wn;
+         return true;
+      }
+
+      bool tryPeek(T &value) {
+         int r = _readOffset;
+         if (r == _writeOffset)
+            return false; // empty
+
+         value = _data[r];
+         return true;
+      }
+
+      void consume() {
+         int r = _readOffset;
+         if (r == _writeOffset) {
+            assert(false && "consume should not have been called");
+            return; // empty
+         }
+
+         int rn = (r + 1) % CAPACITY;
+         _readOffset = rn;
+      }
+
+      bool tryPop(T &value) {
+         if (!tryPeek(value))
+            return false;
+
+         consume();
+         return true;
+      }
+
+      void reset() {
+         _writeOffset = 0;
+         _readOffset = 0;
+      }
+
+   private:
+      std::array<T, CAPACITY> _data;
+      std::atomic<int> _writeOffset = {0};
+      std::atomic<int> _readOffset = {0};
+   };
+}} // namespace clap::helpers