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- // nonfinite_legacy.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 Basic tests of nonfinite loopback with output and input facet.
- \detail Basic loopback test outputs using the so-called 'legacy' facets,
- "1.#INF" and "1.#QNAN".
- and reads back in using nonfinite input 'legacy' facet, and
- (if possible) checks if loopback OK.
- */
- #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 <iomanip>
- using std::setfill;
- using std::setw;
- #include <locale>
- using std::locale;
- #include <sstream>
- using std::stringstream;
- #include <limits>
- using std::numeric_limits;
- #include <assert.h>
- int main()
- {
- // Create a new locale with both the nonfinite facets.
- std::locale new_locale(std::locale(std::locale(),
- new boost::math::nonfinite_num_put<char>),
- new boost::math::nonfinite_num_get<char>);
- {
- stringstream ss;
- ss.imbue(new_locale);
- double inf = numeric_limits<double>::infinity();
- ss << inf; // Write out.
- double r;
- ss >> r; // Read back in.
- cout << "infinity output was " << inf << endl;
- cout << "infinity input was " << r << endl;
- BOOST_ASSERT(inf == r);
- }
- {
- stringstream ss;
- ss.imbue(new_locale);
- double nan = numeric_limits<double>::quiet_NaN();
- ss << nan; // Write out.
- double v;
- ss >> v; // Read back in.
- cout << "NaN output was " << nan << endl;
- cout << "NaN input was " << v << endl;
- // BOOST_ASSERT(nan == v); // Always fails because NaN == NaN fails!
- // BOOST_ASSERT(nan == numeric_limits<double>::quiet_NaN()); asserts!
- }
- } // int main()
- /*
- Output:
- infinity output was 1.#INF
- infinity input was 1.#INF
- NaN output was 1.#QNAN
- NaN input was 1.#QNAN
- */
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