| /*============================================================================= |
| Copyright (c) 2003 Vaclav Vesely |
| http://spirit.sourceforge.net/ |
| |
| Use, modification and distribution is subject to 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) |
| =============================================================================*/ |
| // |
| // This example demonstrates no_actions_d directive. |
| // |
| // The no_actions_d directive ensures, that semantic actions of the inner |
| // parser would NOT be invoked. See the no_actions_scanner in the Scanner |
| // and Parsing chapter in the User's Guide. |
| // |
| //----------------------------------------------------------------------------- |
| |
| #include <cassert> |
| #include <iostream> |
| #include <boost/cstdlib.hpp> |
| #include <boost/spirit/include/classic_core.hpp> |
| |
| using namespace std; |
| using namespace boost; |
| using namespace BOOST_SPIRIT_CLASSIC_NS; |
| |
| //----------------------------------------------------------------------------- |
| |
| int main() |
| { |
| // To use the rule in the no_action_d directive we must declare it with |
| // the no_actions_scanner scanner |
| rule<no_actions_scanner<>::type> r; |
| |
| int i(0); |
| |
| // r is the rule with the semantic action |
| r = int_p[assign_a(i)]; |
| |
| parse_info<> info = parse( |
| "1", |
| |
| no_actions_d |
| [ |
| r |
| ] |
| ); |
| |
| assert(info.full); |
| // Check, that the action hasn't been invoked |
| assert(i == 0); |
| |
| return exit_success; |
| } |
| |
| //----------------------------------------------------------------------------- |