Issue 4127 - [emscripten] Convert subscription classes to C++ - Part 2

compiled/bindings.ipp

 #pragma once
 
 #include <cstdint>
 #include <cstdio>
 #include <cstdlib>
 #include <exception>
 #include <map>
 #include <string>
 #include <type_traits>
 #include <utility>
@@ skipping 423 matching lines @@
       else
       {
         result += "    var type = HEAP32[result + " + std::to_string(offset)+ " >> 2];\n";
         result += "    if (type in " + cls.name + "_mapping)\n";
         result += "      result = new (exports[" + cls.name + "_mapping[type]])(result);\n";
         result += "    else\n";
         result += "      throw new Error('Unexpected " + cls.name + " type: ' + type);\n";
       }
 
       result += "  }\n";
+      result += "  else\n";
+      result += "    result = null;\n";

[Wladimir Palant, 2017/03/16 18:31:23]

This isn't strictly necessary but expecting 0 as return value in unit tests
turned out a bit awkward.

       return result;
     }
     else
       throw std::runtime_error("Unexpected return type for " + std::string(call.name));
   }
 
   const std::string wrapCall(const FunctionInfo& call)
   {
     char buffer[20];
     bool hasStringArgs = false;
@@ skipping 284 matching lines @@
 
     std::vector<std::pair<int, std::string>> mapping;
     for (const auto& item : list)
       mapping.emplace_back(item.first, item.second);
 
     bindings_internal::register_differentiator(
         bindings_internal::TypeInfo<ClassType>(), offset, mapping);
     return *this;
   }
 };