FFI::StructLayout::Function

static VALUE
function_field_get(VALUE self, VALUE pointer)
{
    StructField* f;
    
    Data_Get_Struct(self, StructField, f);

    return rbffi_Function_NewInstance(f->rbType, (*rbffi_AbstractMemoryOps.pointer->get)(MEMORY(pointer), f->offset));
}

static VALUE
function_field_put(VALUE self, VALUE pointer, VALUE proc)
{
    StructField* f;
    VALUE value = Qnil;

    Data_Get_Struct(self, StructField, f);

    if (NIL_P(proc) || rb_obj_is_kind_of(proc, rbffi_FunctionClass)) {
        value = proc;
    } else if (rb_obj_is_kind_of(proc, rb_cProc) || rb_respond_to(proc, rb_intern("call"))) {
        value = rbffi_Function_ForProc(f->rbType, proc);
    } else {
        rb_raise(rb_eTypeError, "wrong type (expected Proc or Function)");
    }

    (*rbffi_AbstractMemoryOps.pointer->put)(MEMORY(pointer), f->offset, value);

    return self;
}