| // |
| // arg_copy_test.cpp - copying a custom placeholder _1 to arg<1> |
| // |
| // Copyright 2016 Peter Dimov |
| // |
| // Distributed under 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 |
| // |
| |
| #include <boost/is_placeholder.hpp> |
| #include <boost/bind/arg.hpp> |
| |
| // |
| |
| template<int I> struct ph |
| { |
| }; |
| |
| namespace boost |
| { |
| |
| template<int I> struct is_placeholder< ::ph<I> > |
| { |
| enum _vt { value = I }; |
| }; |
| |
| } // namespace boost |
| |
| int main() |
| { |
| boost::arg<1> a1 = ph<1>(); |
| (void)a1; |
| } |