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Tip of the Day
Language: C++
Expertise: Beginner
Apr 4, 2005



Application Security Testing: An Integral Part of DevOps

Detect an Operator Overloading a Class

How can you detect if a class overloads a particular operator when you don't have the source for the class? You can define the operator globally so that it accepts all user defined types:

class no_operator {};

class Any
   Any(...){cout<<"this is a placeholder for all kinds of UDTs"};

Disclaimer : ellipsis does not ensure type safety.

no_operator& operator+(const Any &,const Any &) 
   cout << "operator not present"<<endl;
   no_operator tmp;
   return tmp;
The above operator will be invoked for an add operation involving at least one UDT—if the operator + is not overloaded in the UDT. For example:

class Foo {
   Foo & operator +(const Foo& a)
   cout<<"operator ovverloaded"<<endl;
   return *this;


int i;
Foo FooObj;

FooObj+i;   //will call Foo::operator+
i+FooObj;   //will call global operator+ since friend Foo&
// operator +(int i, const Foo& a) is not defined
This can be detected as follows:

if(strcmp(typeid(FooObj+i).name(),"class Foo")==0)
   cout<< "OVERLOADED" << endl;
   else cout <<"NOT OVERLOADED"<<endl; 
Vishakha Vaidya
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