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Templates, Exceptions, and RTTI
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data The compiler will automatically generate the correct type of object according to the type you specify when the object is created The general form of a generic class declaration is shown here template <class Ttype> class class-name { // } Here, Ttype is the placeholder type name that will be specified when a class is instantiated If necessary, you may define more than one generic data type using a comma-separated list Once you have created a generic class, you create a specific instance of that class using the following general form: class-name <type> ob; Here, type is the type name of the data that the class will be operating upon Member functions of a generic class are, themselves, automatically generic They need not be explicitly specified as such using template In the following program, a generic stack class is created that implements a standard last-in, first-out stack Thus, it can be used to provide a stack for any type of object In the example shown here, a character stack, an integer stack, and a floating-point stack are created
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// Demonstrate a generic stack class #include <iostream> using namespace std; const int SIZE = 100; // This creates the generic class stack template <class SType> class stack { SType stck[SIZE]; int tos; public: stack(); ~stack(); void push(SType i); SType pop(); }; // stack's constructor function template <class SType> stack<SType>::stack() {
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tos = 0; cout << "Stack Initialized\n"; } /* stack's destructor function This function is not required It is included for illustration only */ template <class SType> stack<SType>::~stack() { cout << "Stack Destroyed\n"; } // Push an object onto the stack template <class SType> void stack<SType>::push(SType i) { if(tos==SIZE) { cout << "Stack is full\n"; return; } stck[tos] = i; tos++; } // Pop an object off the stack template <class SType> SType stack<SType>::pop() { if(tos==0) { cout << "Stack underflow\n"; return 0; } tos--; return stck[tos]; } int main() { stack<int> a; // create integer stack stack<double> b; // create a double stack stack<char> c; // create a character stack
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int i; // use the integer and double stacks apush(1); bpush(993); apush(2); bpush(-1223); cout cout cout cout << << << << apop() apop() bpop() bpop() << << << << " "; " "; " "; "\n";
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// demonstrate the character stack for(i=0; i<10; i++) cpush((char) 'A'+i); for(i=0; i<10; i++) cout << cpop(); cout << "\n"; return 0; } C++
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As you can see, the declaration of a generic class is similar to that of a generic function The generic data type is used in the class declaration and in its member functions It is not until an object of the stack is declared that the actual data type is determined When a specific instance of stack is declared, the compiler automatically generates all the necessary functions and data to handle the actual data In this example, three different types of stacks are declared (One for ints, one for doubles, and one for chars) Pay special attention to these declarations:
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stack<int> a; // create integer stack stack<double> b; // create a double stack stack<char> c; // create a character stack
Notice how the desired data type is passed inside the angle brackets By changing the type of data specified when stack objects are created, you can change the type of data stored in that stack For example, you could create another stack that stores character pointers by using this declaration:
stack<char *> chrptrstck;
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You can also create stacks to store data types that you create For example, suppose you want to store address information using this structure:
struct char char char char char } addr { name[40]; street[40]; city[30]; state[3]; zip[12];
Then, to use stack to generate a stack that will store objects of type addr, use a declaration like this:
stack<addr> obj;
A template class can have more than one generic data type Simply declare all the data types required by the class in a comma-separated list within the template specification For example, the following short example creates a class that uses two generic data types
/* This example uses two generic data types in a class definition */ #include <iostream> using namespace std; template <class Type1, class Type2> class myclass { Type1 i; Type2 j; public: myclass(Type1 a, Type2 b) { i = a; j = b; } void show() { cout << i << ' ' << j << '\n'; } }; int main() { myclass<int, double> ob1(10, 023); myclass<char, char *> ob2('X', "This is a test");
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