1 // nonfinite_facet_sstream.cpp
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)
7 // Copyright (c) 2006 Johan Rade
8 // Copyright (c) 2011 Paul A. Bristow
12 \brief Examples of nonfinite with output and input facets and stringstreams.
14 \detail Contruct a new locale with the nonfinite_num_put and nonfinite_num_get
15 facets and imbue istringstream, ostringstream and stringstreams,
16 showing output and input (and loopback for the stringstream).
20 #include <boost/math/special_functions/nonfinite_num_facets.hpp>
21 using boost::math::nonfinite_num_put;
22 using boost::math::nonfinite_num_get;
24 using boost::math::legacy;
33 using std::stringstream;
34 using std::istringstream;
35 using std::ostringstream;
38 using std::numeric_limits;
44 //[nonfinite_facets_sstream_1
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]
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.
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;
59 BOOST_ASSERT(oss.str() == "inf");
64 iss.imbue(new_locale);
66 iss >> inf; // Read from "inf"
67 cout << "Infinity input was " << iss.str() << endl;
68 BOOST_ASSERT(inf == numeric_limits<double>::infinity());
72 //[nonfinite_facets_sstream_2
75 double inf = numeric_limits<double>::infinity();
76 ss << inf; // Write out.
77 BOOST_ASSERT(ss.str() == "inf");
79 ss >> r; // Read back in.
80 BOOST_ASSERT(inf == r); // Confirms that the double values really are identical.
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.
90 //] [/nonfinite_facets_sstream_2]
97 double nan = numeric_limits<double>::quiet_NaN();
98 ss << nan; // Write out.
99 BOOST_ASSERT(ss.str() == "nan");
102 ss >> v; // Read back in.
104 cout << "NaN output was " << ss.str() << endl;
105 cout << "NaN input was " << v << endl;
107 // assert(nan == v); // Always fails because NaN == NaN fails!
108 // assert(nan == numeric_limits<double>::quiet_NaN()); asserts!
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.
121 //[nonfinite_facet_sstream_output
123 infinity output was inf
124 Infinity input was inf
125 infinity output was inf
126 infinity input was 1.#INF
128 NaN input was 1.#QNAN
130 //] [nonfinite_facet_sstream_output]