Using the post-increment operator in initialization list

Question

Can I use the post-increment operator with initialization list arguments? For example something like this:

template <class T> struct MyClass
{
  MyClass(T& val): myvar(val++) {/*body*/}
  protected: T myvar;
};

And will code in the constructor body be affected by the change?

Answer 1

Yes you can. The myvar member will have the value of val before the increment.

We should considere that val will have a type supporting the post-increment operator.

template <class T> struct MyClass
{
    MyClass(T val): myvar(val++) {/*body*/}
//          ^
protected:
    T myvar;
};

MyClass<int> foo( 1 );

// Here myvar will have the value 1

And don't forget the type of val passed to the MyClass constructor.