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Fix issue: recursive_wrapper is not nothrow move constructible

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Antony Polukhin
2017-01-22 12:29:58 +03:00
parent fd2a03827f
commit 82f0ef1c1a
1 changed files with 4 additions and 2 deletions
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6
include/boost/variant/recursive_wrapper_fwd.hpp
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@@ -4,7 +4,7 @@
//-----------------------------------------------------------------------------
//
// Copyright (c) 2002 Eric Friedman, Itay Maman
// Copyright (c) 2016 Antony Polukhin
// Copyright (c) 2016-2017 Antony Polukhin
//
// Portions Copyright (C) 2002 David Abrahams
//
@@ -66,7 +66,9 @@ template <class T, class U> struct is_constructible<recursive_wrapper<T>, const
template <class T, class U> struct is_constructible<recursive_wrapper<T>, recursive_wrapper<U>& > : boost::false_type{};
template <class T, class U> struct is_constructible<recursive_wrapper<T>, const recursive_wrapper<U>& > : boost::false_type{};
template <class T> struct is_nothrow_move_constructible<recursive_wrapper<T> > : boost::true_type{};
// recursive_wrapper is not nothrow move constructible, because it's constructor does dynamic memory allocation.
// This specialisation is required to workaround GCC6 issue: https://svn.boost.org/trac/boost/ticket/12680
template <class T> struct is_nothrow_move_constructible<recursive_wrapper<T> > : boost::false_type{};
///////////////////////////////////////////////////////////////////////////////
// metafunction is_recursive_wrapper (modeled on code by David Abrahams)