57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
/*=============================================================================
|
|
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 <boost/assert.hpp>
|
|
#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
|
|
]
|
|
);
|
|
|
|
BOOST_ASSERT(info.full);
|
|
// Check, that the action hasn't been invoked
|
|
BOOST_ASSERT(i == 0);
|
|
|
|
return exit_success;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|