1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
// Copyright David Abrahams 2003.
// Distributed under 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)
#include <boost/iterator/iterator_adaptor.hpp>
#include <boost/static_assert.hpp>
#include "static_assert_same.hpp"
#include <boost/type_traits/broken_compiler_spec.hpp>
#include <boost/iterator/detail/minimum_category.hpp>
struct X { int a; };
BOOST_TT_BROKEN_COMPILER_SPEC(X)
struct Xiter : boost::iterator_adaptor<Xiter,X*>
{
Xiter();
Xiter(X* p) : boost::iterator_adaptor<Xiter, X*>(p) {}
};
void take_xptr(X*) {}
void operator_arrow_test()
{
// check that the operator-> result is a pointer for lvalue iterators
X x;
take_xptr(Xiter(&x).operator->());
}
template <class T, class U, class Min>
struct static_assert_min_cat
: static_assert_same<
typename boost::detail::minimum_category<T,U>::type, Min
>
{};
void category_test()
{
using namespace boost;
using namespace boost::detail;
BOOST_STATIC_ASSERT((
!boost::is_convertible<
std::input_iterator_tag
, input_output_iterator_tag>::value));
BOOST_STATIC_ASSERT((
!boost::is_convertible<
std::output_iterator_tag
, input_output_iterator_tag>::value));
BOOST_STATIC_ASSERT((
boost::is_convertible<
input_output_iterator_tag
, std::input_iterator_tag>::value));
BOOST_STATIC_ASSERT((
boost::is_convertible<
input_output_iterator_tag
, std::output_iterator_tag>::value));
#if 0 // This seems wrong; we're not advertising
// input_output_iterator_tag are we?
BOOST_STATIC_ASSERT((
boost::is_convertible<
std::forward_iterator_tag
, input_output_iterator_tag>::value));
#endif
int test = static_assert_min_cat<
std::input_iterator_tag,input_output_iterator_tag, std::input_iterator_tag
>::value;
test = static_assert_min_cat<
input_output_iterator_tag,std::input_iterator_tag, std::input_iterator_tag
>::value;
#if 0
test = static_assert_min_cat<
input_output_iterator_tag,std::forward_iterator_tag, input_output_iterator_tag
>::value;
#endif
test = static_assert_min_cat<
std::input_iterator_tag,std::forward_iterator_tag, std::input_iterator_tag
>::value;
test = static_assert_min_cat<
std::input_iterator_tag,std::random_access_iterator_tag, std::input_iterator_tag
>::value;
#if 0 // This would be wrong: a random access iterator is not
// neccessarily writable, as is an output iterator.
test = static_assert_min_cat<
std::output_iterator_tag,std::random_access_iterator_tag, std::output_iterator_tag
>::value;
#endif
(void)test;
}
int main()
{
category_test();
operator_arrow_test();
return 0;
}
|
