projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | |
| 2 | // Copyright 2010 Paul A. Bristow | |
| 3 | // | |
| 4 | // Distributed under the Boost Software License, Version 1.0. (See | |
| 5 | // accompanying file LICENSE_1_0.txt or copy at | |
| 6 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 7 | ||
| 8 | /* Temporary test program to discover which platforms support | |
| 9 | ||
| 10 | numeric_limits | |
| 11 | ||
| 12 | digits10 and | |
| 13 | ||
| 14 | new max_digits10. | |
| 15 | ||
| 16 | This is needed to produce or select a macro to avoid compilation failure in Boost.Test | |
| 17 | for platforms that do not include either or both of these. | |
| 18 | ||
| 19 | BOOST_NO_CXX11_NUMERIC_LIMITS is tested here. | |
| 20 | ||
| 21 | [Boost C++ Libraries] | |
| 22 | ||
| 23 | #5758: Boost.Test Floating-point comparison diagnostic output does not support radix 10. | |
| 24 | ||
| 25 | */ | |
| 26 | ||
| 27 | #include <boost/config.hpp> | |
| 28 | #include <boost/version.hpp> | |
| 29 | ||
| 30 | #include <iostream> | |
| 31 | #include <limits> | |
| 32 | ||
| 33 | int main() | |
| 34 | { | |
| 35 | std::cout << "Platform: " << BOOST_PLATFORM << '\n' | |
| 36 | << "Compiler: " << BOOST_COMPILER << '\n' | |
| 37 | << "STL : " << BOOST_STDLIB << '\n' | |
| 38 | << "Boost : " << BOOST_VERSION/100000 << "." | |
| 39 | << BOOST_VERSION/100 % 1000 << "." | |
| 40 | << BOOST_VERSION % 100 << std::endl; | |
| 41 | ||
| 42 | int digits10 = std::numeric_limits<double>::digits10; | |
| 43 | std::cout << "std::numeric_limits<double>::digits10 = " << digits10 << std::endl; | |
| 44 | ||
| 45 | #ifndef BOOST_NO_CXX11_NUMERIC_LIMITS | |
| 46 | // OK to use C++11 max_digits10; | |
| 47 | int max_digits10 = std::numeric_limits<double>::max_digits10; | |
| 48 | std::cout << "std::numeric_limits<double>::max_digits10 = " << max_digits10 << std::endl; | |
| 49 | #else | |
| 50 | // No support for max_digits10; so use Kahan formula instead. | |
| 51 | int max_digits10 = 2 + std::numeric_limits<double>::digits * 3010/10000; | |
| 52 | std::cout << "2 + std::numeric_limits<double>::digits * 3010/10000; = " << | |
| 53 | 2 + std::numeric_limits<double>::digits * 3010/10000; | |
| 54 | #endif | |
| 55 | ||
| 56 | ||
| 57 | } // int main() | |
| 58 | ||
| 59 | /* | |
| 60 | ||
| 61 | Output: | |
| 62 | ||
| 63 | Description: Autorun "J:\Cpp\MathToolkit\test\Math_test\Debug\ztest_max_digits10.exe" | |
| 64 | Platform: Win32 | |
| 65 | Compiler: Microsoft Visual C++ version 10.0 | |
| 66 | STL : Dinkumware standard library version 520 | |
| 67 | Boost : 1.50.0 | |
| 68 | std::numeric_limits<double>::digits10 = 15 | |
| 69 | std::numeric_limits<double>::max_digits10 = 17 | |
| 70 | ||
| 71 | 1> Description: Autorun "J:\Cpp\Misc\Debug\zztest_max_digits10.exe" | |
| 72 | 1> Platform: Win32 | |
| 73 | 1> Compiler: Microsoft Visual C++ version 12.0 | |
| 74 | 1> STL : Dinkumware standard library version 610 | |
| 75 | 1> Boost : 1.55.0 | |
| 76 | 1> std::numeric_limits<double>::digits10 = 15 | |
| 77 | 1> std::numeric_limits<double>::max_digits10 = 17 | |
| 78 | ||
| 79 | ||
| 80 | */ |