fix unused value() call

Author: dgehringer

include/sqsgen/io/config/combined.h

@@ -50,15 +50,16 @@ namespace sqsgen::io::config {
                                   std::vector<sublattice> const& composition) {
     using result_t = parse_result<seed_t>;
     auto num_sublattices = sublattice_mode == SUBLATTICE_MODE_INTERACT ? 1 : composition.size();
-    if (auto seed = get_either_optional<key, std::uint64_t, seed_t>(document); seed.has_value()) {
+    if (accessor<Document>::contains(document, key.data)) {
+      auto seed = get_either<key, std::uint64_t, seed_t>(document);
       if (iteration_mode == ITERATION_MODE_SYSTEMATIC)
         return parse_error::from_msg<key, CODE_BAD_ARGUMENT>(
             "You cannot specify a seed if you have set the iteration mode to \"systematic\". The "
             "seed is only used for random iterations, but in systematic mode there is no "
             "randomness involved.");
       else
         // here we have random mode with a value
-        return seed.value().template collapse<seed_t>(
+        return seed.template collapse<seed_t>(
             [num_sublattices](std::uint64_t&& value) -> result_t {
               return seed_t(num_sublattices, std::make_optional(value));
             },

js/wasm/sqsgen.cpp

@@ -179,6 +179,7 @@ EMSCRIPTEN_BINDINGS(m) {
   register_optional<val>();
   register_optional<std::string>();
   register_optional<std::size_t>();
+  register_optional<std::uint64_t>();
   register_optional<double>();
 
   enum_<sqsgen::Prec>("Prec")