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1 | // Copyright (C) 2005, Fernando Luis Cacciola Carballal. |
2 | // | |
3 | // Use, modification, and distribution is subject to the Boost Software | |
4 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | // See http://www.boost.org/libs/optional for documentation. | |
8 | // | |
9 | // You are welcome to contact the author at: | |
10 | // fernando_cacciola@hotmail.com | |
11 | // | |
12 | #ifndef BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP | |
13 | #define BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP | |
14 | ||
15 | #include <istream> | |
16 | #include <ostream> | |
17 | ||
18 | #include "boost/none.hpp" | |
19 | #include "boost/optional/optional.hpp" | |
20 | ||
21 | ||
22 | namespace boost | |
23 | { | |
24 | ||
25 | template<class CharType, class CharTrait> | |
26 | inline | |
27 | std::basic_ostream<CharType, CharTrait>& | |
28 | operator<<(std::basic_ostream<CharType, CharTrait>& out, none_t) | |
29 | { | |
30 | if (out.good()) | |
31 | { | |
32 | out << "--"; | |
33 | } | |
34 | ||
35 | return out; | |
36 | } | |
37 | ||
38 | template<class CharType, class CharTrait, class T> | |
39 | inline | |
40 | std::basic_ostream<CharType, CharTrait>& | |
41 | operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v) | |
42 | { | |
43 | if (out.good()) | |
44 | { | |
45 | if (!v) | |
46 | out << "--" ; | |
47 | else out << ' ' << *v ; | |
48 | } | |
49 | ||
50 | return out; | |
51 | } | |
52 | ||
53 | template<class CharType, class CharTrait, class T> | |
54 | inline | |
55 | std::basic_istream<CharType, CharTrait>& | |
56 | operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v) | |
57 | { | |
58 | if (in.good()) | |
59 | { | |
60 | int d = in.get(); | |
61 | if (d == ' ') | |
62 | { | |
63 | T x; | |
64 | in >> x; | |
65 | #ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES | |
66 | v = boost::move(x); | |
67 | #else | |
68 | v = x; | |
69 | #endif | |
70 | } | |
71 | else | |
72 | { | |
73 | if (d == '-') | |
74 | { | |
75 | d = in.get(); | |
76 | ||
77 | if (d == '-') | |
78 | { | |
79 | v = none; | |
80 | return in; | |
81 | } | |
82 | } | |
83 | ||
84 | in.setstate( std::ios::failbit ); | |
85 | } | |
86 | } | |
87 | ||
88 | return in; | |
89 | } | |
90 | ||
91 | } // namespace boost | |
92 | ||
93 | #endif | |
94 |