From cb539ffc879d8a6a6398bc9620bf0680598c918a Mon Sep 17 00:00:00 2001
From: Bryan Matsuo <bryan.matsuo@gmail.com>
Date: Thu, 12 Nov 2015 01:46:30 -0800
Subject: [PATCH] lmdb: hack to avoid windows compilation error involving
 mdb_filehandle_t

Relates to #33

The type is a pointer on Windows and comparing a pointer to the value -1
is non-trivial in Go.  The comparison has been replaced with a concise
but delicate hack that is untested as of yet.
---
 lmdb/env.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lmdb/env.go b/lmdb/env.go
index d718dc1d..70fc5ff2 100644
--- a/lmdb/env.go
+++ b/lmdb/env.go
@@ -102,7 +102,7 @@ func (env *Env) FD() (uintptr, error) {
 	if err != nil {
 		return 0, err
 	}
-	if mf == C.mdb_filehandle_t(-1) {
+	if uintptr(mf) == ^uintptr(0) {
 		return 0, errNotOpen
 	}
 	return uintptr(mf), nil