From 54d496a9f9cf203d545e8385026d83d3f71cf5fb Mon Sep 17 00:00:00 2001
From: cxl <cxl@f0d560ea-af0d-0410-9eb7-867de7ffcac7>
Date: Fri, 14 Aug 2020 07:54:16 +0000
Subject: [PATCH] .docs

git-svn-id: svn://ultimatepp.org/upp/trunk@14819 f0d560ea-af0d-0410-9eb7-867de7ffcac7
---
 uppsrc/Core/Callback.h                 | 2 +-
 uppsrc/Core/src.tpp/Function_en-us.tpp | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/uppsrc/Core/Callback.h b/uppsrc/Core/Callback.h
index c9578afa2..aeed8c0cd 100644
--- a/uppsrc/Core/Callback.h
+++ b/uppsrc/Core/Callback.h
@@ -1,4 +1,4 @@
-// Backward compatibility
+// Backward compatibility; use Function/Event in the new code
 
 template <class... ArgTypes>
 class CallbackN : Moveable<CallbackN<ArgTypes...>> {
diff --git a/uppsrc/Core/src.tpp/Function_en-us.tpp b/uppsrc/Core/src.tpp/Function_en-us.tpp
index 4a34e8af4..da6b2c44a 100644
--- a/uppsrc/Core/src.tpp/Function_en-us.tpp
+++ b/uppsrc/Core/src.tpp/Function_en-us.tpp
@@ -100,7 +100,9 @@ String>] is equivalent of [*C@5 Function<void (int, String)>].&]
 [s5;:Upp`:`:Gate`:`:typedef:%- [@(0.0.255) template <typename... ][*@4 ArgTypes][@(0.0.255) >
  using]_[* Gate]_`=_Function<[@(0.0.255) bool]_(ArgTypes[@(0.0.255) ...])>&]
 [s2; Creates alias for Function returning bool. For example, [*C@5 Gate<int, 
-String>] is equivalent of [*C@5 Function<bool (int, String)>].&]
+String>] is equivalent of [*C@5 Function<bool (int, String)>]. 
+Note that empty Gate returns false (because empty Function returns 
+bool(), which is false).&]
 [s3;%- &]
 [s0;%- &]
 [ {{10000@(113.42.0) [s0; [*@7;4 MemFn and THISFN]]}}&]