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hana/example/core/disable.cpp
2014-07-16 16:26:23 -04:00

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C++

/*
@copyright Louis Dionne 2014
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#include <boost/hana/core.hpp>
#include <boost/hana/detail/static_assert.hpp>
#include <boost/hana/ext/std/tuple.hpp>
#include <boost/hana/list/list.hpp>
using namespace boost::hana;
namespace boost { namespace hana {
template <>
struct Foldable::instance<StdTuple> : disable { };
}}
int main() {
// Usually, List should provide Foldable.
BOOST_HANA_STATIC_ASSERT(instantiates<List, StdTuple>);
BOOST_HANA_STATIC_ASSERT(!instantiates<Foldable, StdTuple>);
}