From 7d79d5298f56c4768a90df629b689d1bc3ebbb31 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 17 Jan 2019 15:48:05 +0300
Subject: Add function_wrapper::cast() that cleanly cast to an incompatible
 function type

---
 odb/details/function-wrapper.ixx | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'odb/details/function-wrapper.ixx')

diff --git a/odb/details/function-wrapper.ixx b/odb/details/function-wrapper.ixx
index d73d578..9ec19ec 100644
--- a/odb/details/function-wrapper.ixx
+++ b/odb/details/function-wrapper.ixx
@@ -36,5 +36,15 @@ namespace odb
       swap (const_cast<function_wrapper<F>&> (x));
       return *this;
     }
+
+    template <typename F>
+    template <typename R>
+    inline R function_wrapper<F>::
+    cast () const
+    {
+      union { F* f; R r; } r;
+      r.f = function;
+      return r.r;
+    }
   }
 }
-- 
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