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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// Boost.Range library
//
// Copyright Neil Groves 2007. 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)
//
// For more information, see http://www.boost.org/libs/range/
//
#ifndef BOOST_RANGE_ADAPTOR_REPLACED_IF_IMPL_HPP_INCLUDED
#define BOOST_RANGE_ADAPTOR_REPLACED_IF_IMPL_HPP_INCLUDED
#include <boost/config.hpp>
#include <boost/range/adaptor/argument_fwd.hpp>
#include <boost/range/iterator_range.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/value_type.hpp>
#include <boost/iterator/iterator_adaptor.hpp>
#include <boost/iterator/transform_iterator.hpp>
namespace boost
{
namespace range_detail
{
template< class Pred, class Value >
class replace_value_if
{
public:
typedef const Value& result_type;
typedef const Value& first_argument_type;
replace_value_if(const Pred& pred, const Value& to)
: m_pred(pred), m_to(to)
{
}
const Value& operator()(const Value& x) const
{
return m_pred(x) ? m_to : x;
}
private:
Pred m_pred;
Value m_to;
};
template< class Pred, class R >
class replaced_if_range :
public boost::iterator_range<
boost::transform_iterator<
replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type >,
BOOST_DEDUCED_TYPENAME range_iterator<R>::type > >
{
private:
typedef replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type > Fn;
typedef boost::iterator_range<
boost::transform_iterator<
replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type >,
BOOST_DEDUCED_TYPENAME range_iterator<R>::type > > base_t;
public:
typedef BOOST_DEDUCED_TYPENAME range_value<R>::type value_type;
replaced_if_range( R& r, const Pred& pred, value_type to )
: base_t( make_transform_iterator( boost::begin(r), Fn(pred, to) ),
make_transform_iterator( boost::end(r), Fn(pred, to) ) )
{ }
};
template< class Pred, class T >
class replace_if_holder
{
public:
replace_if_holder( const Pred& pred, const T& to )
: m_pred(pred), m_to(to)
{ }
const Pred& pred() const { return m_pred; }
const T& to() const { return m_to; }
private:
Pred m_pred;
T m_to;
};
template< class Pred, class InputRng >
inline replaced_if_range<Pred, InputRng>
operator|( InputRng& r,
const replace_if_holder<Pred, BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f )
{
return replaced_if_range<Pred, InputRng>(r, f.pred(), f.to());
}
template< class Pred, class InputRng >
inline replaced_if_range<Pred, const InputRng>
operator|( const InputRng& r,
const replace_if_holder<Pred, BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f )
{
return replaced_if_range<Pred, const InputRng>(r, f.pred(), f.to());
}
} // 'range_detail'
using range_detail::replaced_if_range;
namespace adaptors
{
namespace
{
const range_detail::forwarder2TU<range_detail::replace_if_holder>
replaced_if =
range_detail::forwarder2TU<range_detail::replace_if_holder>();
}
template<class Pred, class InputRange>
inline replaced_if_range<Pred, InputRange>
replace_if(InputRange& rng, Pred pred,
BOOST_DEDUCED_TYPENAME range_value<InputRange>::type to)
{
return range_detail::replaced_if_range<Pred, InputRange>(rng, pred, to);
}
template<class Pred, class InputRange>
inline replaced_if_range<Pred, const InputRange>
replace_if(const InputRange& rng, Pred pred,
BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type to)
{
return range_detail::replaced_if_range<Pred, const InputRange>(rng, pred, to);
}
} // 'adaptors'
} // 'boost'
#endif // include guard
|
