Add to_u64 as syntactic sugar to switch on atoms

libcaf_core/caf/atom.hpp

@@ -38,6 +38,11 @@ enum class atom_value : uint64_t {
 /// @relates atom_value
 std::string to_string(const atom_value& x);
 
+/// @relates atom_value
+constexpr uint64_t to_u64(atom_value x) {
+  return static_cast<uint64_t>(x);
+}
+
 atom_value atom_from_string(const std::string& x);
 
 /// Creates an atom from given string literal.
@@ -58,9 +63,6 @@ struct atom_constant {
   constexpr operator atom_value() const {
     return V;
   }
-  static constexpr uint64_t uint_value() {
-    return static_cast<uint64_t>(V);
-  }
   /// Returns an instance *of this constant* (*not* an `atom_value`).
   static const atom_constant value;
 };
@@ -76,10 +78,15 @@ struct is_atom_constant<atom_constant<X>> {
 };
 
 template <atom_value V>
-std::string to_string(const atom_constant<V>&) {
+std::string to_string(atom_constant<V>) {
   return to_string(V);
 }
 
+template <atom_value V>
+constexpr uint64_t to_u64(atom_constant<V>) {
+  return static_cast<uint64_t>(V);
+}
+
 template <atom_value V>
 const atom_constant<V> atom_constant<V>::value = atom_constant<V>{};
 

libcaf_io/src/basp_broker.cpp

@@ -239,7 +239,7 @@ void basp_broker_state::deliver(const node_id& src_nid, actor_id src_aid,
     switch (static_cast<uint64_t>(msg.get_as<atom_value>(0))) {
       default:
         break;
-      case link_atom::value.uint_value(): {
+      case to_u64(link_atom::value): {
         if (src_nid != this_node()) {
           CAF_LOG_WARNING("received link message for an other node");
           return;
@@ -258,7 +258,7 @@ void basp_broker_state::deliver(const node_id& src_nid, actor_id src_aid,
         static_cast<actor_proxy*>(ptr->get())->local_link_to(src->get());
         return;
       }
-      case unlink_atom::value.uint_value(): {
+      case to_u64(unlink_atom::value): {
         if (src_nid != this_node()) {
           CAF_LOG_WARNING("received unlink message for an other node");
           return;