ceph/src/boost/libs/phoenix/test/function/lazy_argument_tests.cpp

   1 ////////////////////////////////////////////////////////////////////////////
   2 // lazy_argument_tests.cpp
   3 //
   4 // lazy argument tests passing lazy function as argument.
   5 //
   6 ////////////////////////////////////////////////////////////////////////////
   7 /*=============================================================================
   8     Copyright (c) 2001-2007 Joel de Guzman
   9     Copyright (c) 2015 John Fletcher
  10
  11     Distributed under the Boost Software License, Version 1.0. (See accompanying
  12     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  13 ==============================================================================*/
  14
  15 #include <boost/phoenix/core/limits.hpp>
  16
  17 #include <boost/detail/lightweight_test.hpp>
  18 #include <boost/phoenix/core.hpp>
  19 #include <boost/phoenix/function.hpp>
  20
  21 namespace example {
  22       struct G {
  23
  24             template <typename Sig>
  25             struct result;
  26
  27             template <typename This, typename A0>
  28             struct result<This(A0)>
  29                : boost::remove_reference<A0>
  30             {};
  31
  32             template <typename T>
  33             T operator()(T t) const { return ++t; }
  34
  35       };
  36 }
  37
  38 typedef boost::phoenix::function<example::G> GG;
  39 boost::phoenix::function<example::G> gg;
  40
  41 template <typename F,typename T>
  42 T h(F f, T const& t)
  43 {
  44   return f(t)();
  45 }
  46
  47 int main()
  48 {
  49   BOOST_TEST( h(gg,1) == 2);
  50   BOOST_TEST(( h<GG,int>(gg,1) == 2));
  51
  52   return boost::report_errors();
  53 }