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1 | // nonfinite_facet_sstream.cpp |
2 | ||
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt | |
5 | // or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | // Copyright (c) 2006 Johan Rade | |
8 | // Copyright (c) 2011 Paul A. Bristow | |
9 | ||
10 | /*! | |
11 | \file | |
12 | \brief Examples of nonfinite with output and input facets and stringstreams. | |
13 | ||
f67539c2 | 14 | \detail Construct a new locale with the nonfinite_num_put and nonfinite_num_get |
7c673cae FG |
15 | facets and imbue istringstream, ostringstream and stringstreams, |
16 | showing output and input (and loopback for the stringstream). | |
17 | ||
18 | */ | |
19 | ||
20 | #include <boost/math/special_functions/nonfinite_num_facets.hpp> | |
21 | using boost::math::nonfinite_num_put; | |
22 | using boost::math::nonfinite_num_get; | |
23 | ||
24 | using boost::math::legacy; | |
25 | ||
26 | #include <iostream> | |
27 | using std::cout; | |
28 | using std::endl; | |
29 | #include <locale> | |
30 | using std::locale; | |
31 | ||
32 | #include <sstream> | |
33 | using std::stringstream; | |
34 | using std::istringstream; | |
35 | using std::ostringstream; | |
36 | ||
37 | #include <limits> | |
38 | using std::numeric_limits; | |
39 | ||
40 | #include <assert.h> | |
41 | ||
42 | int main() | |
43 | { | |
44 | //[nonfinite_facets_sstream_1 | |
45 | locale old_locale; | |
46 | locale tmp_locale(old_locale, new nonfinite_num_put<char>); | |
47 | locale new_locale(tmp_locale, new nonfinite_num_get<char>); | |
48 | //] [/nonfinite_facets_sstream_1] | |
49 | ||
50 | // Note that to add two facets, nonfinite_num_put and nonfinite_num_get, | |
51 | // you have to add one at a time, using a temporary locale. | |
52 | ||
53 | { | |
54 | ostringstream oss; | |
55 | oss.imbue(new_locale); | |
56 | double inf = numeric_limits<double>::infinity(); | |
57 | oss << inf; // Write out. | |
58 | cout << "infinity output was " << oss.str() << endl; | |
92f5a8d4 | 59 | BOOST_ASSERT(oss.str() == "inf"); |
7c673cae FG |
60 | } |
61 | { | |
62 | istringstream iss; | |
63 | iss.str("inf"); | |
64 | iss.imbue(new_locale); | |
65 | double inf; | |
66 | iss >> inf; // Read from "inf" | |
67 | cout << "Infinity input was " << iss.str() << endl; | |
92f5a8d4 | 68 | BOOST_ASSERT(inf == numeric_limits<double>::infinity()); |
7c673cae FG |
69 | } |
70 | ||
71 | { | |
72 | //[nonfinite_facets_sstream_2 | |
73 | stringstream ss; | |
74 | ss.imbue(new_locale); | |
75 | double inf = numeric_limits<double>::infinity(); | |
76 | ss << inf; // Write out. | |
92f5a8d4 | 77 | BOOST_ASSERT(ss.str() == "inf"); |
7c673cae FG |
78 | double r; |
79 | ss >> r; // Read back in. | |
92f5a8d4 | 80 | BOOST_ASSERT(inf == r); // Confirms that the double values really are identical. |
7c673cae FG |
81 | |
82 | cout << "infinity output was " << ss.str() << endl; | |
83 | cout << "infinity input was " << r << endl; | |
84 | // But the string representation of r displayed will be the native type | |
85 | // because, when it was constructed, cout had NOT been imbued | |
86 | // with the new locale containing the nonfinite_numput facet. | |
87 | // So the cout output will be "1.#INF on MS platforms | |
88 | // and may be "inf" or other string representation on other platforms. | |
89 | ||
90 | //] [/nonfinite_facets_sstream_2] | |
91 | } | |
92 | ||
93 | { | |
94 | stringstream ss; | |
95 | ss.imbue(new_locale); | |
96 | ||
97 | double nan = numeric_limits<double>::quiet_NaN(); | |
98 | ss << nan; // Write out. | |
92f5a8d4 | 99 | BOOST_ASSERT(ss.str() == "nan"); |
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100 | |
101 | double v; | |
102 | ss >> v; // Read back in. | |
103 | ||
104 | cout << "NaN output was " << ss.str() << endl; | |
105 | cout << "NaN input was " << v << endl; | |
106 | ||
107 | // assert(nan == v); // Always fails because NaN == NaN fails! | |
108 | // assert(nan == numeric_limits<double>::quiet_NaN()); asserts! | |
109 | ||
110 | // And the string representation will be the native type | |
111 | // because cout has NOT been imbued with a locale containing | |
112 | // the nonfinite_numput facet. | |
113 | // So the output will be "1.#QNAN on MS platforms | |
114 | // and may be "nan" or other string representation on other platforms. | |
115 | } | |
116 | ||
117 | } // int main() | |
118 | ||
119 | ||
120 | /* | |
121 | //[nonfinite_facet_sstream_output | |
122 | ||
123 | infinity output was inf | |
124 | Infinity input was inf | |
125 | infinity output was inf | |
126 | infinity input was 1.#INF | |
127 | NaN output was nan | |
128 | NaN input was 1.#QNAN | |
129 | ||
130 | //] [nonfinite_facet_sstream_output] | |
131 | */ | |
132 |