A constructor taking a single argument is by default an implicit conversion operator:
class C {
int I;
//...
public:
C(int i);//constructor and implicit conversion operator
//as well
};
void f() {
C c(0);
c = 5; //implicit conversion of 5 to a C object and
//then assignment
}
The compiler re-edits the above sample as if the programmer had written:
//////////////////////////////////////////////////////////////////////////////////////////
//"c=5;" transformed by the compiler into something like this:
/////////////////////////////////////////////////////////////////////////////////////////
C temp(5);//temporary object instantiated,
c = temp; //assigned using operator =
temp.C::~C(); //temp's destructor activated
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