ceph/src/boost/libs/proto/example/hello.cpp

   1 //[ HelloWorld
   2 ////////////////////////////////////////////////////////////////////
   3 //  Copyright 2008 Eric Niebler. Distributed under the Boost
   4 //  Software License, Version 1.0. (See accompanying file
   5 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <iostream>
   8 #include <boost/proto/core.hpp>
   9 #include <boost/proto/context.hpp>
  10 // This #include is only needed for compilers that use typeof emulation:
  11 #include <boost/typeof/std/ostream.hpp>
  12 namespace proto = boost::proto;
  13
  14 proto::terminal< std::ostream & >::type cout_ = {std::cout};
  15
  16 template< typename Expr >
  17 void evaluate( Expr const & expr )
  18 {
  19     proto::default_context ctx;
  20     proto::eval(expr, ctx);
  21 }
  22
  23 int main()
  24 {
  25     evaluate( cout_ << "hello" << ',' << " world" );
  26     return 0;
  27 }
  28 //]