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class Foo
{
private:
    int iX;
public:
    Foo() { iX = 5; };
 
    int getData()          
    {                            
        return iX;  
    }
 
    Foo& operator=(const Foo &RHS);
};
 
Foo& Foo::operator=(const Foo &RHS)
{
    if(this != &RHS)
    {    // the if this test prevents an object from copying to itself (ie. RHS = RHS;)
        this->iX = RHS.iX;     // this is suitable for this class, but can be more complex when
                               // copying an object in a different much larger class
    }
 
    return (*this);            // returning an object allows chaining, like a = b = c; statements
}

/usr/bin/../lib/gcc/i586-linux-gnu/4.9/../../../i386-linux-gnu/crt1.o: In function `_start':
/build/glibc-5CYv_T/glibc-2.19/csu/../sysdeps/i386/start.S:111: undefined reference to `main'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Standard output is empty