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- // 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 native nonfinite loopback.
- \detail Basic loopback test outputs using the platforms built-in facets
- and reads back in, and checks if loopback OK.
- Using MSVC this doesn't work OK:
- input produces just "1" instead of "1.#QNAN", 1.#SNAN" or 1.#IND"!
- */
- #include <iostream>
- using std::cout;
- using std::endl;
- #include <locale>
- using std::locale;
- #include <string>
- using std::string;
- #include <sstream>
- using std::stringstream;
- #include <limits>
- using std::numeric_limits;
- int main()
- {
- locale default_locale; // Current global locale.
- // Try to use the default locale first.
- // On MSVC this doesn't work.
- { // Try infinity.
- stringstream ss; // Both input and output.
- ss.imbue(default_locale); // Redundant, of course.
- string infs;
- if(numeric_limits<double>::has_infinity)
- { // Make sure infinity is specialised for type double.
- double inf = numeric_limits<double>::infinity();
- ss << inf; // Output infinity.
- infs = ss.str(); //
- }
- else
- { // Need to provide a suitable string for infinity.
- infs = "1.#INF"; // Might suit MSVC?
- ss << infs;
- }
- double r;
- ss >> r; // Read back in.
- cout << "infinity output was " << infs << endl; // "1.#INF"
- cout << "infinity input was " << r << endl; // "1"
- }
- { // Try Quiet NaN
- stringstream ss; // Both input and output.
- ss.imbue(default_locale); // Redundant, of course.
- string infs;
- if(numeric_limits<double>::has_quiet_NaN)
- { // Make sure quiet NaN is specialised for type double.
- double qnan = numeric_limits<double>::quiet_NaN();
- ss << qnan; // Output quiet_NaN.
- infs = ss.str(); //
- }
- else
- { // Need to provide a suitable string for quiet_NAN.
- infs = "1.#QNAN";
- ss << infs;
- }
- double r;
- ss >> r; // Read back in.
- cout << "quiet_NaN output was " << infs << endl; // "1.#QNAN"
- cout << "quiet_NaN input was " << r << endl; // "1#"
- }
- } // int main()
- /*
- Output (MSVC Version 10.0):
- infinity output was 1.#INF
- infinity input was 1
- quiet_NaN output was 1.#QNAN
- quiet_NaN input was 1
- */
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