build: require gcc >= 5.3, boost >= 1.58, openssl >= 1.0.2
This effectively drops support for all versions of Ubuntu older than 16.04
Change-Id: Ie3ab7df9147e97f6467658a6399a4f9379f089c1
Refs: #4462
diff --git a/src/util/signal/scoped-connection.cpp b/src/util/signal/scoped-connection.cpp
index cbbfaba..3fed4a3 100644
--- a/src/util/signal/scoped-connection.cpp
+++ b/src/util/signal/scoped-connection.cpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
- * Copyright (c) 2013-2017 Regents of the University of California.
+ * Copyright (c) 2013-2018 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
@@ -25,14 +25,10 @@
namespace util {
namespace signal {
-#if NDN_CXX_HAVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE
static_assert(std::is_nothrow_move_constructible<ScopedConnection>::value,
"ScopedConnection must be MoveConstructible with noexcept");
-#endif // NDN_CXX_HAVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE
-ScopedConnection::ScopedConnection()
-{
-}
+ScopedConnection::ScopedConnection() = default;
ScopedConnection::ScopedConnection(const Connection& connection)
: m_connection(connection)