Stick with 2 layouts only when pretty printing

Question

I'm pretty-printing a C++ method declaration and I want arguments list to be rendered in a compact form if it fits the line:

void method(MyLongClassName& instance, const MyClass& c);

or to be formatted in columns if it doesn't:

void method(      MyLongClassName& instance,
            const MyClass&         c,
                  int              counter);

all other layouts I want to eliminate from consideration. It seems to be simple neither with wl-pprint nor with pretty, if not hacking the sources.

Any ideas?

Answer 1

A solution to a more general problem how to choose a layout that fits to a single line or, if none, use a substitute can be found here: Optional spaces and multiple alternatives in wl-pprint-extras