From 8fc9a7e56b9f5f46868e1c44f1e59359574af9c2 Mon Sep 17 00:00:00 2001
From: Simon Rozman <simon@rozman.si>
Date: Wed, 6 Dec 2023 15:25:48 +0100
Subject: [PATCH] stream: allow invalid handle detection in cached_file

Otherwise one cannot distinguish between file open but in failed state
and file not open.

Signed-off-by: Simon Rozman <simon@rozman.si>
---
 include/stdex/stream.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/stdex/stream.hpp b/include/stdex/stream.hpp
index 4fe6f8c10..ae7d176d0 100644
--- a/include/stdex/stream.hpp
+++ b/include/stdex/stream.hpp
@@ -3167,6 +3167,11 @@ namespace stdex
 				open(filename.c_str(), mode);
 			}
 
+			///
+			/// Returns true if file has a valid handle
+			///
+			inline operator bool() const noexcept { return m_source; }
+
 		protected:
 			file m_source;
 		};