Long constructor initialization lists

Question

How do you deal with them? I have some classes (usually classes that hold stats etc.) with some 20+ variable members, and the initialization lists end up very long, extending beyond the page width if I don't manually wrap around. Do you try and break down such classes or do you deal with this in some other way?

It doesn't look very tidy, but sometimes I write the variables in the list on top of each other like so:

myConstructor(var1, var2, var3, ..., varN) :
 member1(var1),
 member2(var2),
 member3(var3),
 ...
 memberN(varN)

Answer 1

the initialization lists end up very long, extending beyond the page width if I don't manually wrap around

One way is to refactor: for example, instead of passing in 4 primitive variables ("top", "left", "width", and "height"), just pass in one compound variable ("rectangle").

Alternatively, just to do with source code layout:

class Foo
{
    int m_a;
    int m_b;
    int m_c;
public:
    Foo(
        int a,
        int b,
        int c
        )
        : m_a(a)
        , m_b(b)
        , m_c(c)
    {
    }
};