*/
#include "stencil.hh"
+#include "protected-scm.hh"
-static SCM heads;
+static Protected_scm heads (SCM_EOL);
void register_stencil_head (SCM symbol)
{
- if (!heads)
- heads = scm_permanent_object (scm_cons (SCM_EOL, SCM_EOL));
-
scm_set_object_property_x (symbol, ly_symbol2scm ("stencil-head?"), SCM_BOOL_T);
- scm_set_cdr_x (heads, scm_cons (symbol, scm_cdr (heads)));
+ heads = scm_cons (symbol, heads);
}
bool
is_stencil_head (SCM symbol)
{
- return scm_object_property (symbol, ly_symbol2scm ("stencil-head?"))
- == SCM_BOOL_T;
+ return to_boolean (scm_object_property (symbol, ly_symbol2scm ("stencil-head?")));
}
SCM
all_stencil_heads ()
{
- return scm_cdr (heads);
+ return heads;
}
-