From e8cf1d6b9a1f22d3de8fbc94311be7a6b31d395a Mon Sep 17 00:00:00 2001
From: Patrick Pelissier <patrick.pelissier@gmail.com>
Date: Wed, 14 Feb 2018 21:12:38 +0100
Subject: [PATCH] Update doc

---
 README.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/README.md b/README.md
index b789c860..fe1e1e54 100644
--- a/README.md
+++ b/README.md
@@ -3291,6 +3291,17 @@ Example:
     #define f(...) M_APPLY(f, M_IF_DEFAULT1(0, __VA_ARGS__))
 This need to be called within a M_APPLY macro.
    
+##### M\_DEFAULT\_ARGS(nbExpectedArg, (defaultArgumentlist), argumentList )
+
+Helper macro to redefine a function with one or more default values.
+defaultArgumentlist is a list of the default value to complete the
+list argumentList to reach the number nbExpectedArg arguments.
+Example:
+    int f(int a, int b, long p, void *q);
+    #define f(...) f(M_DEFAULT_ARGS(4, (0, 1, NULL), __VA_ARGS__))
+The last 3 arguments have their default value as 0 (for b),
+1 (for p) and NULL (for q).
+
 ##### M\_NOTEQUAL(x, y)
 
 Return 1 if x != y, 0 otherwise (resolution is performed at preprocessing time).