From 95bb371b0d46fddf449f1248f2399247e0a250e2 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Thu, 10 Oct 2019 00:25:24 +0300
Subject: [PATCH] mdbx-test: fix build by non-c++17 compilers.

Change-Id: I899f1a39eb8fde3ce3821b5964885f1121e65be3
---
 test/nested.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/nested.cc b/test/nested.cc
index e6202464..e407f2eb 100644
--- a/test/nested.cc
+++ b/test/nested.cc
@@ -75,7 +75,11 @@ void testcase_nested::push_txn() {
       prng32() & (MDBX_NOSYNC | MDBX_NOMETASYNC | MDBX_MAPASYNC), &txn);
   if (unlikely(err != MDBX_SUCCESS))
     failure_perror("mdbx_txn_begin(nested)", err);
+#if __cplusplus >= 201703L
   stack.emplace(txn, serial, fifo, speculum);
+#else
+  stack.push(std::make_tuple(scoped_txn_guard(txn), serial, fifo, speculum));
+#endif
   std::swap(txn_guard, std::get<0>(stack.top()));
   log_verbose("begin level#%zu txn, serial %" PRIu64, stack.size(), serial);
 }