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Andrzej Krzemienski
33 lines
806 B
C++
33 lines
806 B
C++
// Copyright (C) 2021 Andrzej Krzemienski.
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//
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/lib/optional for documentation.
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//
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// You are welcome to contact the author at:
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// akrzemi1@gmail.com
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template <typename U>
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struct wrapper {};
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template <typename /*Tag*/, typename U>
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int get(wrapper<U> const&) { return 0; }
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#include "boost/optional/optional.hpp"
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namespace boost
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{
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struct any_type_in_boost_namespace {};
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}
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class tag; // user-defined tag
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int main()
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{
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// the following tests if boost::get for optional<> does
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// not interfere with the global get
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return get<tag>(wrapper<boost::any_type_in_boost_namespace>());
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}
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