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