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- // 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 Contruct 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_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_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_ASSERT(ss.str() == "inf");
- double r;
- ss >> r; // Read back in.
- BOOST_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_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]
- */
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