Using 64bit unsigned int for comparison

Author: joto

include/osmium/index/relations_map.hpp

@@ -356,7 +356,8 @@ namespace osmium {
              */
             void add(const osmium::unsigned_object_id_type member_id, const osmium::unsigned_object_id_type relation_id) {
                 assert(m_valid && "You can't use the RelationsMap any more after calling build_index()");
-                if (member_id <= std::numeric_limits<uint32_t>::max() && relation_id <= std::numeric_limits<uint32_t>::max()) {
+                constexpr const osmium::unsigned_object_id_type max32 = std::numeric_limits<uint32_t>::max();
+                if (member_id <= max32 && relation_id <= max32) {
                     m_map32.set(member_id, relation_id);
                 } else {
                     m_map64.set(member_id, relation_id);