1 /*============================================================================= 2 Copyright (c) 2017 Paul Fultz II 3 unpack.cpp 4 Distributed under the Boost Software License, Version 1.0. (See accompanying 5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 ==============================================================================*/ 7 #include <boost/hof/unpack.hpp> 8 9 struct foo 10 {}; 11 12 namespace boost { namespace hof { 13 14 template<> 15 struct unpack_sequence<foo> 16 { 17 template<class F, class S> applyboost::hof::unpack_sequence18 constexpr static int apply(F&&, S&&) 19 { 20 return 0; 21 } 22 }; 23 } 24 main()25int main() { 26 boost::hof::unpack(boost::hof::always(1))(foo{}); 27 } 28