Object slicing

<h2 id="example">Example</h2>
struct A
{
    A(int a) : a_var(a) {}
    int a_var;
};

struct B : public A
{
    B(int a, int b) : A(a), b_var(b) {}
    int b_var;
};

B &getB()
{
    static B b(1, 2);
    return b;
}

int main()
{
    // Normal assignment by value to a
    A a(3);
    // a.a_var == 3
    a = getB();
    // a.a_var == 1, b.b_var not copied to a

B b2(3, 4);
    // b2.a_var == 3, b2.b_var == 4
    A &a2 = b2;
    // Partial assignment by value through reference to b2
    a2 = getB();
    // b2.a_var == 1, b2.b_var == 4!

return 0;
}

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Diamond_problem/kFvNb9rY">Diamond problem</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>R., Subburaj (2013). Object Oriented Programming with C++ ANSI /ISO Standard. Vikas Publishing House. p. 260-261. ISBN 978-93-259-6996-4. <a href="978-93-259-6996-4" target="_blank">978-93-259-6996-4</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Grimes, Richard (2017-04-24). Beginning C++ Programming. Birmingham: Packt Publishing Ltd. p. 309. ISBN 978-1-78712-928-3. <a href="978-1-78712-928-3" target="_blank">978-1-78712-928-3</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

Object slicing open-in-new

Object slicing