1/*
2 Copyright (c) Marshall Clow 2011-2012.
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7 For more information, see http://www.boost.org
8*/
9
10#include <iostream>
11
12#include <boost/config.hpp>
13#include <boost/algorithm/gather.hpp>
14
15#define BOOST_TEST_MAIN
16#include <boost/test/unit_test.hpp>
17
18#include <string>
19#include <vector>
20#include <list>
21
22#include "iterator_test.hpp"
23
24namespace ba = boost::algorithm;
25
26template <typename Container>
27void print ( const char *prompt, const Container &c ) {
28 std::cout << prompt << " { ";
29 std::copy ( c.begin (), c.end (), std::ostream_iterator<typename Container::value_type>(std::cout, " "));
30 std::cout << std::endl;
31 }
32
33template <typename Iterator, typename Predicate>
34void test_iterators ( Iterator first, Iterator last, Predicate comp, std::size_t offset ) {
35// Create the pivot point
36 Iterator off = first;
37 std::advance(off, offset);
38
39// Gather the elements
40 std::pair<Iterator, Iterator> res = ba::gather ( first, last, off, comp );
41
42// We should now have three sequences, any of which may be empty:
43// * [begin .. result.first) - items that do not satisfy the predicate
44// * [result.first .. result.second) - items that do satisfy the predicate
45// * [result.second .. end) - items that do not satisfy the predicate
46 Iterator iter = first;
47 for ( ; iter != res.first; ++iter )
48 BOOST_CHECK ( !comp ( *iter ));
49 for ( ; iter != res.second; ++iter)
50 BOOST_CHECK ( comp ( *iter ));
51 for ( ; iter != last; ++iter )
52 BOOST_CHECK ( !comp ( *iter ));
53 }
54
55template <typename Container, typename Predicate>
56void test_iterator_types ( const Container &c, Predicate comp, std::size_t offset ) {
57 typedef std::vector<typename Container::value_type> vec;
58
59 typedef bidirectional_iterator<typename vec::iterator> BDI;
60 typedef random_access_iterator<typename vec::iterator> RAI;
61
62 vec v;
63 v.assign ( c.begin (), c.end ());
64 test_iterators ( BDI ( v.begin ()), BDI ( v.end ()), comp, offset );
65 v.assign ( c.begin (), c.end ());
66 test_iterators ( RAI ( v.begin ()), RAI ( v.end ()), comp, offset );
67 }
68
69
70template <typename T>
71struct less_than {
72public:
73// typedef T argument_type;
74// typedef bool result_type;
75
76 less_than ( T foo ) : val ( foo ) {}
77 less_than ( const less_than &rhs ) : val ( rhs.val ) {}
78
79 bool operator () ( const T &v ) const { return v < val; }
80private:
81 less_than ();
82 less_than operator = ( const less_than &rhs );
83 T val;
84 };
85
86bool is_even ( int i ) { return i % 2 == 0; }
87bool is_ten ( int i ) { return i == 10; }
88
89void test_sequence1 () {
90 std::vector<int> v;
91
92 for ( int i = 5; i < 15; ++i )
93 v.push_back ( i );
94 test_iterator_types ( v, less_than<int>(10), 0 ); // at beginning
95 test_iterator_types ( v, less_than<int>(10), 5 );
96 test_iterator_types ( v, less_than<int>(10), v.size () - 1 ); // at end
97
98 test_iterator_types ( v, is_even, 0 );
99 test_iterator_types ( v, is_even, 5 );
100 test_iterator_types ( v, is_even, v.size () - 1 );
101
102// Exactly one element in the sequence matches
103 test_iterator_types ( v, is_ten, 0 );
104 test_iterator_types ( v, is_ten, 5 );
105 test_iterator_types ( v, is_ten, v.size () - 1 );
106
107// Everything in the sequence matches
108 test_iterator_types ( v, less_than<int>(99), 0 );
109 test_iterator_types ( v, less_than<int>(99), 5 );
110 test_iterator_types ( v, less_than<int>(99), v.size () - 1 );
111
112// Nothing in the sequence matches
113 test_iterator_types ( v, less_than<int>(0), 0 );
114 test_iterator_types ( v, less_than<int>(0), 5 );
115 test_iterator_types ( v, less_than<int>(0), v.size () - 1 );
116
117// All the elements in the sequence are the same
118 v.clear ();
119 for ( int i = 0; i < 11; ++i )
120 v.push_back ( 10 );
121
122// Everything in the sequence matches
123 test_iterator_types ( v, is_ten, 0 );
124 test_iterator_types ( v, is_ten, 5 );
125 test_iterator_types ( v, is_ten, v.size () - 1 );
126
127// Nothing in the sequence matches
128 test_iterator_types ( v, less_than<int>(5), 0 );
129 test_iterator_types ( v, less_than<int>(5), 5 );
130 test_iterator_types ( v, less_than<int>(5), v.size () - 1 );
131
132 }
133
134
135BOOST_AUTO_TEST_CASE( test_main )
136{
137 test_sequence1 ();
138}
139