1///////////////////////////////////////////////////////////////////////////////
2// test_assert_with_placeholder.hpp
3//
4// Copyright 2008 Eric Niebler. Distributed under the Boost
5// Software License, Version 1.0. (See accompanying file
6// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7
8#include <boost/xpressive/xpressive.hpp>
9#include <boost/xpressive/regex_actions.hpp>
10#include <boost/test/unit_test.hpp>
11
12using namespace boost::xpressive;
13
14placeholder<int> const _cnt = {.proto_expr_: {}};
15
16struct count_a_impl
17{
18 typedef void result_type;
19
20 void operator()(int &cnt) const
21 {
22 ++cnt;
23 }
24};
25
26boost::xpressive::function<count_a_impl>::type const count_a = {.child0: {}};
27
28struct check_a_impl
29{
30 typedef bool result_type;
31
32 bool operator()(int &cnt, int val) const
33 {
34 if(cnt < val)
35 {
36 ++cnt;
37 return true;
38 }
39 return false;
40 }
41};
42
43boost::xpressive::function<check_a_impl>::type const check_a = {.child0: {}};
44
45void test_assert_with_placeholder()
46{
47 int cnt = 0;
48 std::string a_str("a_aaaaa___a_aa_aaa_");
49 const sregex expr1(*(as_xpr('a')[count_a(_cnt)] | '_'));
50 const sregex expr2(*(as_xpr('a')[check(check_a(_cnt, 5))] | '_'));
51
52 sregex_iterator iter1(a_str.begin(), a_str.end(), expr1,
53 let(_cnt = cnt));
54 BOOST_CHECK_EQUAL(iter1->str(0), a_str);
55 BOOST_CHECK_EQUAL(cnt, 12);
56
57 cnt = 0;
58 sregex_iterator iter2(a_str.begin(), a_str.end(), expr2,
59 let(_cnt = cnt));
60
61 BOOST_CHECK_EQUAL(iter2->str(0), std::string("a_aaaa"));
62 BOOST_CHECK_EQUAL(cnt, 5);
63}
64
65using namespace boost::unit_test;
66///////////////////////////////////////////////////////////////////////////////
67// init_unit_test_suite
68//
69test_suite* init_unit_test_suite( int argc, char* argv[] )
70{
71 test_suite *test = BOOST_TEST_SUITE("test that custom assertions can use argument placeholders");
72
73 test->add(BOOST_TEST_CASE(&test_assert_with_placeholder));
74
75 return test;
76}
77

source code of boost/libs/xpressive/test/test_assert_with_placeholder.cpp