lib: default_arg_strict becomes macro.

* lib.h (default_arg_strict): Inline function converted to
macro, so that we can suppress the evaluation of the default
expression if it is not required. The default_arg_strict idiom
is being used all over the stream library now. The common
default value expressions like std_out are macros that access
the dynamic variable by symbol. We don't want to be wastefully
doing that on each stream operation, whether or not a stream
argument has been supplied.

1 files changed, 1 insertions, 4 deletions

diff --git a/lib.h b/lib.h
index 07ff1edf..7f227b53 100644
--- a/lib.h
+++ b/lib.h
@@ -1286,10 +1286,7 @@ INLINE val default_null_arg(val arg)
   return if3(missingp(arg), nil, arg);
 }
 
-INLINE val default_arg_strict(val arg, val dfl)
-{
-  return if3(missingp(arg), dfl, arg);
-}
+#define default_arg_strict(arg, dfl) if3(missingp(arg), dfl, arg)
 
 #define list_collect_decl(OUT, PTAIL)           \
   val OUT = nil;                                \