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value constructor is sfinae-friendly

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This commit is contained in:
Andrzej Krzemienski
2016-02-19 18:41:42 +01:00
parent 5ffa3fd2f6
commit f6e09fbf9c
6 changed files with 73 additions and 7 deletions
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1
test/Jamfile.v2
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@ -39,6 +39,7 @@ import testing ;
[ run optional_test_emplace.cpp ]
[ run optional_test_minimum_requirements.cpp ]
[ run optional_test_msvc_bug_workaround.cpp ]
[ compile optional_test_sfinae_friendly_value_ctor.cpp ]
[ compile-fail optional_test_ref_convert_assign_const_int_prevented.cpp ]
[ compile-fail optional_test_fail1.cpp ]
[ compile-fail optional_test_fail3a.cpp ]

38
test/optional_test_sfinae_friendly_value_ctor.cpp Normal file
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@ -0,0 +1,38 @@
// Copyright (C) 2014 Andrzej Krzemienski.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// akrzemi1@gmail.com
#include "boost/optional/optional.hpp"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
using boost::optional;
#if (!defined BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT)
struct X {};
struct Y {};
struct Resource
{
explicit Resource(const X&) {}
};
BOOST_STATIC_ASSERT(( boost::is_constructible<Resource, const X&>::value));
BOOST_STATIC_ASSERT((!boost::is_constructible<Resource, const Y&>::value));
BOOST_STATIC_ASSERT(( boost::is_constructible<optional<Resource>, const X&>::value));
BOOST_STATIC_ASSERT((!boost::is_constructible<optional<Resource>, const Y&>::value));
#endif
int main() { }