MaxWrapper: Add choices param (list of symbols <-> bitset)

source/include/FluidMaxWrapper.hpp

@@ -822,6 +822,41 @@ class FluidMaxWrapper
     }
   };
 
+  template <size_t N>
+  struct Setter<ChoicesT, N>
+  {
+
+    static t_max_err set(FluidMaxWrapper<Client>* x, t_object* /*attr*/,
+                         long ac, t_atom* av)
+    {
+      while (x->mInPerform) {} // spin-wait
+
+      x->messages().reset();
+      auto desc = x->params().template descriptorAt<N>();
+
+      typename ChoicesT::type a{ac ? 0u : desc.defaultValue};
+
+
+      for (index i = 0; i < static_cast<index>(ac); i++)
+      {
+          t_symbol* s = atom_getsym(av + i);
+          index pos = desc.lookup(s->s_name);
+          if(pos == -1)
+          {
+            object_error((t_object*)x,"%s: unrecognised choice",s->s_name);
+            continue;
+          }
+          a.set(pos,1);
+      }
+
+      x->params().template set<N>(std::move(a), x->verbose() ? &x->messages() : nullptr);
+
+      object_attr_touch((t_object*) x, gensym("latency"));
+      return MAX_ERR_NONE;
+    }
+  };
+
+
   //////////////////////////////////////////////////////////////////////////////
 
   // Getter
@@ -870,6 +905,33 @@ class FluidMaxWrapper
       return MAX_ERR_NONE;
     }
   };
+
+  template <size_t N>
+  struct Getter<ChoicesT,N>
+  {
+    static constexpr index argSize = paramDescriptor<N>().fixedSize;
+
+    static t_max_err get(FluidMaxWrapper<Client>* x, t_object* /*attr*/,
+                         long* ac, t_atom** av)
+    {
+
+      typename ChoicesT::type& a = x->params().template get<N>();
+      auto desc = x->params().template descriptorAt<N>();
+
+      index argSize = a.count();
+
+      char alloc;
+      atom_alloc_array(argSize, ac, av, &alloc);
+
+      for (index i = 0, arg = 0; i < desc.numOptions; i++)
+      {
+        if(a[i])
+          ParamAtomConverter::toAtom(*av + arg++,desc.strings[i]);
+      }
+
+      return MAX_ERR_NONE;
+    }
+  };
 
   //////////////////////////////////////////////////////////////////////////////
 
@@ -1830,6 +1892,8 @@ class FluidMaxWrapper
   static t_symbol* maxAttrType(FFTParamsT) { return gensym("atom"); }
   static t_symbol* maxAttrType(StringT) { return USESYM(symbol); }
   static t_symbol* maxAttrType(LongArrayT) { return gensym("atom"); }
+  static t_symbol* maxAttrType(ChoicesT) { return gensym("atom"); }
+
 
   template <typename T>
   static std::enable_if_t<IsSharedClient<typename T::type>::value, t_symbol*>