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81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
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// Copyright 2010 Paul A. Bristow
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/* Temporary test program to discover which platforms support
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numeric_limits
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digits10 and
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new max_digits10.
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This is needed to produce or select a macro to avoid compilation failure in Boost.Test
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for platforms that do not include either or both of these.
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BOOST_NO_CXX11_NUMERIC_LIMITS is tested here.
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[Boost C++ Libraries]
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#5758: Boost.Test Floating-point comparison diagnostic output does not support radix 10.
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*/
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#include <boost/config.hpp>
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#include <boost/version.hpp>
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#include <iostream>
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#include <limits>
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int main()
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{
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std::cout << "Platform: " << BOOST_PLATFORM << '\n'
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<< "Compiler: " << BOOST_COMPILER << '\n'
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<< "STL : " << BOOST_STDLIB << '\n'
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<< "Boost : " << BOOST_VERSION/100000 << "."
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<< BOOST_VERSION/100 % 1000 << "."
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<< BOOST_VERSION % 100 << std::endl;
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int digits10 = std::numeric_limits<double>::digits10;
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std::cout << "std::numeric_limits<double>::digits10 = " << digits10 << std::endl;
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#ifndef BOOST_NO_CXX11_NUMERIC_LIMITS
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// OK to use C++11 max_digits10;
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int max_digits10 = std::numeric_limits<double>::max_digits10;
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std::cout << "std::numeric_limits<double>::max_digits10 = " << max_digits10 << std::endl;
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#else
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// No support for max_digits10; so use Kahan formula instead.
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int max_digits10 = 2 + std::numeric_limits<double>::digits * 3010/10000;
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std::cout << "2 + std::numeric_limits<double>::digits * 3010/10000; = " <<
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2 + std::numeric_limits<double>::digits * 3010/10000;
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#endif
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} // int main()
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/*
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Output:
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Description: Autorun "J:\Cpp\MathToolkit\test\Math_test\Debug\ztest_max_digits10.exe"
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Platform: Win32
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Compiler: Microsoft Visual C++ version 10.0
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STL : Dinkumware standard library version 520
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Boost : 1.50.0
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std::numeric_limits<double>::digits10 = 15
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std::numeric_limits<double>::max_digits10 = 17
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1> Description: Autorun "J:\Cpp\Misc\Debug\zztest_max_digits10.exe"
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1> Platform: Win32
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1> Compiler: Microsoft Visual C++ version 12.0
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1> STL : Dinkumware standard library version 610
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1> Boost : 1.55.0
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1> std::numeric_limits<double>::digits10 = 15
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1> std::numeric_limits<double>::max_digits10 = 17
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*/
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