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133 lines
3.5 KiB
C++
133 lines
3.5 KiB
C++
// nonfinite_facet_sstream.cpp
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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// Copyright (c) 2006 Johan Rade
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// Copyright (c) 2011 Paul A. Bristow
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/*!
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\file
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\brief Examples of nonfinite with output and input facets and stringstreams.
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\detail Contruct a new locale with the nonfinite_num_put and nonfinite_num_get
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facets and imbue istringstream, ostringstream and stringstreams,
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showing output and input (and loopback for the stringstream).
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*/
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#include <boost/math/special_functions/nonfinite_num_facets.hpp>
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using boost::math::nonfinite_num_put;
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using boost::math::nonfinite_num_get;
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using boost::math::legacy;
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#include <iostream>
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using std::cout;
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using std::endl;
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#include <locale>
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using std::locale;
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#include <sstream>
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using std::stringstream;
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using std::istringstream;
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using std::ostringstream;
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#include <limits>
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using std::numeric_limits;
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#include <assert.h>
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int main()
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{
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//[nonfinite_facets_sstream_1
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locale old_locale;
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locale tmp_locale(old_locale, new nonfinite_num_put<char>);
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locale new_locale(tmp_locale, new nonfinite_num_get<char>);
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//] [/nonfinite_facets_sstream_1]
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// Note that to add two facets, nonfinite_num_put and nonfinite_num_get,
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// you have to add one at a time, using a temporary locale.
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{
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ostringstream oss;
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oss.imbue(new_locale);
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double inf = numeric_limits<double>::infinity();
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oss << inf; // Write out.
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cout << "infinity output was " << oss.str() << endl;
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assert(oss.str() == "inf");
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}
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{
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istringstream iss;
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iss.str("inf");
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iss.imbue(new_locale);
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double inf;
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iss >> inf; // Read from "inf"
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cout << "Infinity input was " << iss.str() << endl;
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assert(inf == numeric_limits<double>::infinity());
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}
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{
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//[nonfinite_facets_sstream_2
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stringstream ss;
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ss.imbue(new_locale);
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double inf = numeric_limits<double>::infinity();
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ss << inf; // Write out.
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assert(ss.str() == "inf");
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double r;
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ss >> r; // Read back in.
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assert(inf == r); // Confirms that the double values really are identical.
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cout << "infinity output was " << ss.str() << endl;
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cout << "infinity input was " << r << endl;
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// But the string representation of r displayed will be the native type
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// because, when it was constructed, cout had NOT been imbued
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// with the new locale containing the nonfinite_numput facet.
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// So the cout output will be "1.#INF on MS platforms
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// and may be "inf" or other string representation on other platforms.
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//] [/nonfinite_facets_sstream_2]
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}
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{
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stringstream ss;
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ss.imbue(new_locale);
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double nan = numeric_limits<double>::quiet_NaN();
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ss << nan; // Write out.
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assert(ss.str() == "nan");
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double v;
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ss >> v; // Read back in.
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cout << "NaN output was " << ss.str() << endl;
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cout << "NaN input was " << v << endl;
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// assert(nan == v); // Always fails because NaN == NaN fails!
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// assert(nan == numeric_limits<double>::quiet_NaN()); asserts!
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// And the string representation will be the native type
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// because cout has NOT been imbued with a locale containing
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// the nonfinite_numput facet.
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// So the output will be "1.#QNAN on MS platforms
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// and may be "nan" or other string representation on other platforms.
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}
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} // int main()
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/*
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//[nonfinite_facet_sstream_output
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infinity output was inf
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Infinity input was inf
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infinity output was inf
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infinity input was 1.#INF
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NaN output was nan
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NaN input was 1.#QNAN
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//] [nonfinite_facet_sstream_output]
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*/
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