ceph/src/boost/libs/spirit/test/lex/set_token_value_phoenix.cpp

   1 //  Copyright (c) 2009 Carl Barron
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #include <string>
   7 #include <iostream>
   8
   9 #include <boost/detail/lightweight_test.hpp>
  10 #include <boost/spirit/include/lex.hpp>
  11 #include <boost/spirit/include/lex_lexertl.hpp>
  12 #include <boost/spirit/include/phoenix.hpp>
  13
  14 namespace lex = boost::spirit::lex;
  15 namespace phoenix = boost::phoenix;
  16
  17 ///////////////////////////////////////////////////////////////////////////////
  18 struct square_impl
  19 {
  20     template <class>
  21     struct result { typedef int type; };
  22
  23     template <class A>
  24     int operator () (const A &x) const
  25     { return (x) * (x); }
  26 };
  27
  28 phoenix::function<square_impl> const square = square_impl();
  29
  30 ///////////////////////////////////////////////////////////////////////////////
  31 template <class Lexer>
  32 struct test_tokens : lex::lexer<Lexer>
  33 {
  34     test_tokens()
  35     {
  36         a = "a";
  37         this->self = a [lex::_val = square(*lex::_start)];
  38     }
  39
  40     lex::token_def<int> a;
  41 };
  42
  43 struct catch_result
  44 {
  45     template <class Token>
  46     bool operator() (Token const& x) const
  47     {
  48         BOOST_TEST(x.value().which() == 1);
  49         BOOST_TEST(boost::get<int>(x.value()) == 9409);  // 9409 == 'a' * 'a'
  50         return true;
  51     }
  52 };
  53
  54 ///////////////////////////////////////////////////////////////////////////////
  55 int main()
  56 {
  57     typedef lex::lexertl::token<std::string::iterator
  58       , boost::mpl::vector<int> > token_type;
  59
  60     std::string in = "a";
  61     std::string::iterator first(in.begin());
  62
  63     test_tokens<lex::lexertl::actor_lexer<token_type> > the_lexer;
  64     BOOST_TEST(lex::tokenize(first, in.end(), the_lexer, catch_result()));
  65
  66     return boost::report_errors();
  67 }