From 75e360b8b3147ee7ef3e3dd932cc874fb8a06de8 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Mon, 28 Sep 2020 17:21:12 +0300
Subject: [PATCH] mdbx++: add `std::hash<>` specialization for `mdbx::slice`.

Change-Id: I4402122f0f088bfa8eea753df931537cfe935086
---
 mdbx.h++ | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mdbx.h++ b/mdbx.h++
index 6d0b64d5..7046369d 100644
--- a/mdbx.h++
+++ b/mdbx.h++
@@ -4624,6 +4624,15 @@ inline std::string to_string(const ::MDBX_error_t &errcode) {
 
 } // namespace mdbx
 
+namespace std {
+template <> struct hash<mdbx::slice> {
+  MDBX_CXX14_CONSTEXPR size_t
+  operator()(mdbx::slice const &slice) const noexcept {
+    return slice.hash_value();
+  }
+};
+} // namespace std
+
 #ifdef _MSC_VER
 #pragma warning(pop)
 #endif