From 2ad86d28a5a46a082327ba84a636112b18101db0 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 10 Sep 2018 12:36:42 +1000
Subject: [PATCH] posix/except: add try_call

---
 posix/except.hpp | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/posix/except.hpp b/posix/except.hpp
index ca59dc94..ec393748 100644
--- a/posix/except.hpp
+++ b/posix/except.hpp
@@ -7,9 +7,9 @@
  *     Danny Robson <danny@nerdcruft.net>
  */
 
-#ifndef CRUFT_UTIL_POSIX_EXCEPT_HPP
-#define CRUFT_UTIL_POSIX_EXCEPT_HPP
+#pragma once
 
+#include <functional>
 #include <stdexcept>
 
 namespace cruft::posix {
@@ -25,6 +25,18 @@ namespace cruft::posix {
         int code (void) const;
         static int last_code (void);
 
+        template <typename FunctionT, typename ...Args>
+        static auto
+        try_call (FunctionT &&func, Args&& ...args)
+        {
+            return try_value (
+                std::invoke (
+                    std::forward<FunctionT> (func),
+                    std::forward<Args> (args)...
+                )
+            );
+        }
+
         static void try_code (void);
         static void try_code (int code);
 
@@ -67,5 +79,3 @@ namespace cruft::posix {
         int m_code;
     };
 };
-
-#endif