Value::UInt64
Value::asUInt64() const
{
   switch ( type_ )
   {
   case nullValue:
      return 0;
   case intValue:
      JSON_ASSERT_MESSAGE( value_.int_ >= 0, "Negative integer can not be converted to UInt64" );
      return value_.int_;
   case uintValue:
      return value_.uint_;
   case realValue:
      JSON_ASSERT_MESSAGE( value_.real_ >= 0  &&  value_.real_ <= maxUInt64,  "Real out of UInt64 range" );
      return UInt( value_.real_ );
   case booleanValue:
      return value_.bool_ ? 1 : 0;
   case stringValue:
   case arrayValue:
   case objectValue:
      JSON_FAIL_MESSAGE( "Type is not convertible to UInt64" );
   default:
      JSON_ASSERT_UNREACHABLE;
   }
   return 0; // unreachable;
}

Value::Int
Value::asInt() const
{
    switch ( type_ )
    {
    case nullValue:
        return 0;
    case intValue:
        JSON_ASSERT_MESSAGE( value_.int_ >= minInt  &&  value_.int_ <= maxInt, "unsigned integer out of signed int range" );
        return Int(value_.int_);
    case uintValue:
#ifdef MODIFY_FUNCTION_SIGN
        // do nothing
#else
        JSON_ASSERT_MESSAGE(value_.uint_ <= UInt(maxInt), "unsigned integer out of signed int range");
#endif
        return Int(value_.uint_);
    case realValue:
        JSON_ASSERT_MESSAGE( value_.real_ >= minInt  &&  value_.real_ <= maxInt, "Real out of signed integer range" );
        return Int( value_.real_ );
    case booleanValue:
        return value_.bool_ ? 1 : 0;
    case stringValue:
    case arrayValue:
    case objectValue:
        JSON_FAIL_MESSAGE( "Type is not convertible to int" );
    default:
        JSON_ASSERT_UNREACHABLE;
    }
    return 0; // unreachable;
}

String Value::asString() const {
  switch (type()) {
  case nullValue:
    return "";
  case stringValue: {
    if (value_.string_ == nullptr)
      return "";
    unsigned this_len;
    char const* this_str;
    decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
                         &this_str);
    return String(this_str, this_len);
  }
  case booleanValue:
    return value_.bool_ ? "true" : "false";
  case intValue:
    return valueToString(value_.int_);
  case uintValue:
    return valueToString(value_.uint_);
  case realValue:
    return valueToString(value_.real_);
  default:
    JSON_FAIL_MESSAGE("Type is not convertible to string");
  }
}

bool Value::asBool() const {
  switch (type_) {
  case booleanValue:
    return value_.bool_;
  case nullValue:
    return false;
  case intValue:
    return value_.int_ ? true : false;
  case uintValue:
    return value_.uint_ ? true : false;
  case realValue:
    // This is kind of strange. Not recommended.
    return (value_.real_ != 0.0) ? true : false;
  default:
    break;
  }
  JSON_FAIL_MESSAGE("Value is not convertible to bool.");
}

std::string 
Value::asString() const
{
   switch ( type_ )
   {
   case nullValue:
      return "";
   case stringValue:
      return value_.string_ ? value_.string_ : "";
   case booleanValue:
      return value_.bool_ ? "true" : "false";
   case intValue:
   case uintValue:
   case realValue:
   case arrayValue:
   case objectValue:
      JSON_FAIL_MESSAGE( "Type is not convertible to string" );
   default:
      JSON_ASSERT_UNREACHABLE;
   }
   return ""; // unreachable
}