1 // nonfinite_legacy.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 Basic tests of nonfinite loopback with output and input facet.
14 \detail Basic loopback test outputs using the so-called 'legacy' facets,
15 "1.#INF" and "1.#QNAN".
17 and reads back in using nonfinite input 'legacy' facet, and
18 (if possible) checks if loopback OK.
22 #include <boost/math/special_functions/nonfinite_num_facets.hpp>
23 using boost::math::nonfinite_num_put;
24 using boost::math::nonfinite_num_get;
26 using boost::math::legacy;
40 using std::stringstream;
42 using std::numeric_limits;
48 // Create a new locale with both the nonfinite facets.
49 std::locale new_locale(std::locale(std::locale(),
50 new boost::math::nonfinite_num_put<char>),
51 new boost::math::nonfinite_num_get<char>);
56 double inf = numeric_limits<double>::infinity();
57 ss << inf; // Write out.
59 ss >> r; // Read back in.
61 cout << "infinity output was " << inf << endl;
62 cout << "infinity input was " << r << endl;
64 BOOST_ASSERT(inf == r);
70 double nan = numeric_limits<double>::quiet_NaN();
71 ss << nan; // Write out.
73 ss >> v; // Read back in.
75 cout << "NaN output was " << nan << endl;
76 cout << "NaN input was " << v << endl;
78 // BOOST_ASSERT(nan == v); // Always fails because NaN == NaN fails!
79 // BOOST_ASSERT(nan == numeric_limits<double>::quiet_NaN()); asserts!
88 infinity output was 1.#INF
89 infinity input was 1.#INF
90 NaN output was 1.#QNAN