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 | |
95 | |