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It does not need any further information about Assign and Semicolon, since these two tokens only have one possible value: = and ; One representation of a token, therefore, might use two members token and valuetoken is a unique code that identifies the token as one of the following: Type, ID, Assign, Constant, or Semicolon For example, the unique code may be an integer value that represents ID by 85 and Semicolon by 72 value holds the particular value of the token For example, for the ID token in the previous declaration, value will contain the character string i; for the Type token, value will contain a representation for the type int The representation of the data member value is problematic Although it contains only one value for any given token, value can hold multiple data types For the ID token, value refers to a character string; for the Constant token, it refers to an integer value One possible way of representing multiple data types, of course, is to use a class The compiler writer can declare value to be of a class type that contains a member for each possible data type that value may represent Using a class as the representation for value solves the problem However, for a given token, value has only one of the multiple possible data types, and only one of the multiple class members is used The class type, however, carries the cumulative storage for all the data members that represent all the possible data types Preferably, the class would maintain storage sufficient to hold only one of the multiple possible data types at a time, not storage to hold them all A union permits just that Here is a definition for a union representing the token data type:

union TokenValue { char _cval; int _ival; char *_sval;

file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (598 / 1065) [2001-3-29 11:32:10]

double _dval; };

is to improve driving comfort and safety and traf c ow. This is achieved by creating les of vehicles where the head vehicles lead the followers by communicating their parameters (in particular their speed). In the platoon, vehicles are controlled to ensure not only short distance but also safe vehicle-to-vehicle separation. Vehicle platoon formation and maintenance can be done by the vehicles themselves, using ad hoc communications and networking and localization. Nearby vehicles rst have to discover each other, establish communications links and routes (if required), exchanged positions and headings, and apply a platoon formation algorithm. An example is depicted in Figure 2.20. In part (a), there is a platoon formation consisting of four vehicles in le. In part (b), the platoon is segmented because of the third vehicle leaving the platoon. In part (c), the fourth vehicle joins the second vehicle in le and the platoon is reconnected.

If the largest data type among the members of TokenValue is dval, the size of TokenValue is the size of an object of type double The members of a union are public members by default The name of a union can be used in a program wherever a class name can be used For example:

// object of type TokenValue TokenValue last_token; // pointer to an object of type TokenValue TokenValue *pt = new TokenValue;

The members of a union are accessed through the class member access operators ( and ->), just like class members, using a union object or a pointer to a union before the operator For example:

indexed shifter . 22(n i 1)

last_token_ival = 97; char ch = pt->_cval;

2.6 EXERCISES 1. Consider a heterogeneous network consisting of four elements: ad hoc hosts, base stations, public telephone network, and geosynchronous satellites. Provide guidelines for an ef cient hierarchical protocol that will enable communication in a networked system connecting these elements. Justify your answers.

Union members can be declared as either public, protected, or private:

union TokenValue { public: char _cval; // private: int priv; }; int main() { TokenValue tp; tp_cval = '\n'; // ok // error: main() cannot access private member // TokenValue::priv tppriv = 1024; }

A union cannot have a static data member or a member that is a reference A union cannot have a member of a class type that defines either a constructor, destructor, or copy assignment operator For example:

union illegal_members { Screen s; // error: has constructor Screen *ps; // ok static int is; // error: static member int &rfi; // error: reference member };