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
|
// nonfinite_facet_sstream.cpp
// 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)
// Copyright (c) 2006 Johan Rade
// Copyright (c) 2011 Paul A. Bristow
/*!
\file
\brief Examples of nonfinite with output and input facets and stringstreams.
\detail Construct a new locale with the nonfinite_num_put and nonfinite_num_get
facets and imbue istringstream, ostringstream and stringstreams,
showing output and input (and loopback for the stringstream).
*/
#include <boost/math/special_functions/nonfinite_num_facets.hpp>
using boost::math::nonfinite_num_put;
using boost::math::nonfinite_num_get;
using boost::math::legacy;
#include <iostream>
using std::cout;
using std::endl;
#include <locale>
using std::locale;
#include <sstream>
using std::stringstream;
using std::istringstream;
using std::ostringstream;
#include <limits>
using std::numeric_limits;
#include <assert.h>
int main()
{
//[nonfinite_facets_sstream_1
locale old_locale;
locale tmp_locale(old_locale, new nonfinite_num_put<char>);
locale new_locale(tmp_locale, new nonfinite_num_get<char>);
//] [/nonfinite_facets_sstream_1]
// Note that to add two facets, nonfinite_num_put and nonfinite_num_get,
// you have to add one at a time, using a temporary locale.
{
ostringstream oss;
oss.imbue(new_locale);
double inf = numeric_limits<double>::infinity();
oss << inf; // Write out.
cout << "infinity output was " << oss.str() << endl;
BOOST_MATH_ASSERT(oss.str() == "inf");
}
{
istringstream iss;
iss.str("inf");
iss.imbue(new_locale);
double inf;
iss >> inf; // Read from "inf"
cout << "Infinity input was " << iss.str() << endl;
BOOST_MATH_ASSERT(inf == numeric_limits<double>::infinity());
}
{
//[nonfinite_facets_sstream_2
stringstream ss;
ss.imbue(new_locale);
double inf = numeric_limits<double>::infinity();
ss << inf; // Write out.
BOOST_MATH_ASSERT(ss.str() == "inf");
double r;
ss >> r; // Read back in.
BOOST_MATH_ASSERT(inf == r); // Confirms that the double values really are identical.
cout << "infinity output was " << ss.str() << endl;
cout << "infinity input was " << r << endl;
// But the string representation of r displayed will be the native type
// because, when it was constructed, cout had NOT been imbued
// with the new locale containing the nonfinite_numput facet.
// So the cout output will be "1.#INF on MS platforms
// and may be "inf" or other string representation on other platforms.
//] [/nonfinite_facets_sstream_2]
}
{
stringstream ss;
ss.imbue(new_locale);
double nan = numeric_limits<double>::quiet_NaN();
ss << nan; // Write out.
BOOST_MATH_ASSERT(ss.str() == "nan");
double v;
ss >> v; // Read back in.
cout << "NaN output was " << ss.str() << endl;
cout << "NaN input was " << v << endl;
// assert(nan == v); // Always fails because NaN == NaN fails!
// assert(nan == numeric_limits<double>::quiet_NaN()); asserts!
// And the string representation will be the native type
// because cout has NOT been imbued with a locale containing
// the nonfinite_numput facet.
// So the output will be "1.#QNAN on MS platforms
// and may be "nan" or other string representation on other platforms.
}
} // int main()
/*
//[nonfinite_facet_sstream_output
infinity output was inf
Infinity input was inf
infinity output was inf
infinity input was 1.#INF
NaN output was nan
NaN input was 1.#QNAN
//] [nonfinite_facet_sstream_output]
*/
|
