Hi,
Right now, the most common pattern for a LY_DEFINE is somewhat repetitive:
LY_DEFINE (ly_name, "ly:name",
req, opt, var, (SCM arg1, SCM arg2, ...),
R"(doc...)")
{
LY_ASSERT_TYPE (is_scm<Cpp_type> (arg1), 1);
Cpp_type arg1_cpp = from_scm<Cpp_type> (arg1);
auto *const smob = LY_ASSERT_SMOB (Smob_type, arg2, 2);
// process the arguments ...
return to_scm (result);
}
We have this really all over the code base.
Does C++ provide tools for making this simpler? I'm thinking that
something like
LY_DEFINE (ly_grob_relative_coordinate, ..., (Grob *g, Grob *refp, Axis
a), ...)
{
...
return ret;
}
would be equivalent to
LY_DEFINE (ly_grob_relative_coordinate, ..., (SCM g_scm, SCM refp_scm,
SCM axis_scm), ...)
{
auto *const g = LY_ASSERT_SMOB (Grob, g_scm, 1);
auto *const refp = LY_ASSERT_SMOB (Grob, refp_scm, 2);
LY_ASSERT_TYPE (is_scm<Axis>, axis_scm, 3);
Axis a = from_scm<Axis> (axis_scm);
...
return to_scm (ret);
}
If this is feasible, I might be willing to spend time on it in the future,
although not very soon.
If it is not feasible, being told it before I try could save me time. I'm
not yet very familiar with C++ templating techniques.
Thanks,
Jean
