How to get around the warning “rvalue used as lvalue”?

Question

I\'m using this tutorial, but when I compile the code from it:

D3DXMatrixLookAtLH(
    &matView,
    &D3DXVECTOR3(0.0f, 10.0f, 0.0f), // warning C423         


        

Answer 1

You are taking the address of a temporary. You can't do that. Declare your vectors beforehand:

D3DXVECTOR3 a(0.0f, 10.0f, 0.0f)
            ,b(0.0f, 0.0f, 0.0f)
            ,c(0.0f, 0.0f, 1.0f);
D3DXMatrixLookAtLH(&matView, &a, &b, &c);

Note that I ignored your "without additional lines of code?" requirement, because that's a stupid requirement.