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libs/math/example/nonfinite_legacy.cpp

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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;
+
+    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;
+
+    // assert(nan == v); // Always fails because NaN == NaN fails!
+    // 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
+
+*/
+