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The main use of this form of typeid is to obtain a type_info object that describes the specified type so that it can be used in a type comparison statement For example, this form of WhatMammal( ) reports that cats don't like water:
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void WhatMammal(Mammal &ob) { cout << "ob is referencing an object of type "; cout << typeid(ob)name() << endl; if(typeid(ob) == typeid(Cat)) cout << "Cats don't like water\n"; }
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A Simple Application of Run-Time Type ID The following program hints at the power of RTTI In the program, the function called factory( ) creates instances of various types of objects derived from the class Mammal (A function that produces objects is sometimes called an object factory) The specific type of object created is determined by the outcome of a call to rand( ), C++'s random number generator Thus, there is no way to know in advance what type of object will be generated The program creates 10 objects and counts the number of each type of mammal Since any type of mammal may be generated by a call to factory( ), the program relies upon typeid to determine which type of object has actually been made
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// Demonstrating run-time type id #include <iostream> using namespace std; class Mammal { public: virtual bool lays_eggs() { return false; } // Mammal is polymorphic // }; class Cat: public Mammal { public: // }; class Platypus: public Mammal { public: bool lays_eggs() { return true; } //
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R u n - Ti m e Ty p e I D a n d t h e C a s t i n g O p e r a t o r s
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}; class Dog: public Mammal { public: // }; // A factory for objects derived from Mammal Mammal *factory() { switch(rand() % 3 ) { case 0: return new Dog; case 1: return new Cat; case 2: return new Platypus; } return 0; } int main() { Mammal *ptr; // pointer to base class int i; int c=0, d=0, p=0; // generate and count objects for(i=0; i<10; i++) { ptr = factory(); // generate an object cout << "Object is " << typeid(*ptr)name(); cout << endl; // count it if(typeid(*ptr) == typeid(Dog)) d++; if(typeid(*ptr) == typeid(Cat)) c++; if(typeid(*ptr) == typeid(Platypus)) p++; } cout cout cout cout << << << << endl; "Animals generated:\n"; " Dogs: " << d << endl; " Cats: " << c << endl;
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C++: The Complete Reference
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cout << " return 0; }
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Platypuses: " << p << endl;
Sample output is shown here
Object Object Object Object Object Object Object Object Object Object is is is is is is is is is is class class class class class class class class class class Platypus Platypus Cat Cat Platypus Cat Dog Dog Cat Platypus
Animals generated: Dogs: 2 Cats: 4 Platypuses: 4
typeid Can Be Applied to Template Classes
The typeid operator can be applied to template classes The type of an object that is an instance of a template class is in part determined by what data is used for its generic data when the object is instantiated Two instances of the same template class that are created using different data are therefore different types Here is a simple example:
// Using typeid with templates #include <iostream> using namespace std; template <class T> class myclass { T a; public: myclass(T i) { a = i; } // };
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R u n - Ti m e Ty p e I D a n d t h e C a s t i n g O p e r a t o r s
int main() { myclass<int> o1(10), o2(9); myclass<double> o3(72); cout << "Type of o1 is "; cout << typeid(o1)name() << endl; cout << "Type of o2 is "; cout << typeid(o2)name() << endl; cout << "Type of o3 is "; cout << typeid(o3)name() << endl; cout << endl; if(typeid(o1) == typeid(o2)) cout << "o1 and o2 are the same type\n"; if(typeid(o1) == typeid(o3)) cout << "Error\n"; else cout << "o1 and o3 are different types\n"; return 0; } C++
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