| // 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. |
| |
| \detail Basic loopback test outputs using nonfinite facets |
| (output and input) and reads back in, and checks if loopback OK. |
| |
| Expected to work portably on all platforms. |
| |
| */ |
| |
| #ifdef _MSC_VER |
| # pragma warning(disable : 4702) |
| # pragma warning(disable : 4127) // conditional expression is constant. |
| #endif |
| |
| #include <boost/math/special_functions/nonfinite_num_facets.hpp> |
| using boost::math::nonfinite_num_get; |
| using boost::math::nonfinite_num_put; |
| |
| #include <iostream> |
| using std::cout; |
| using std::endl; |
| |
| #include <locale> |
| using std::locale; |
| |
| #include <sstream> |
| using std::stringstream; |
| #include <limits> |
| using std::numeric_limits; |
| |
| #include <assert.h> |
| |
| int main() |
| { |
| |
| if((std::numeric_limits<double>::has_infinity == false) || (std::numeric_limits<double>::infinity() == 0)) |
| { |
| std::cout << "Infinity not supported on this platform." << std::endl; |
| return 0; |
| } |
| |
| if((std::numeric_limits<double>::has_quiet_NaN == false) || (std::numeric_limits<double>::quiet_NaN() == 0)) |
| { |
| std::cout << "NaN not supported on this platform." << std::endl; |
| return 0; |
| } |
| //locale old_locale; // Current global locale. |
| // Create tmp_locale and store the output nonfinite_num_put facet in it. |
| //locale tmp_locale(old_locale, new nonfinite_num_put<char>); |
| // Create new_locale and store the input nonfinite_num_get facet in it. |
| //locale new_locale(tmp_locale, new nonfinite_num_get<char>); |
| // Can only add one facet at a time, hence need a tmp_locale. |
| // Unless we write: |
| |
| std::locale new_locale(std::locale(std::locale(std::locale(), |
| new boost::math::nonfinite_num_put<char>), |
| new boost::math::nonfinite_num_get<char>)); |
| |
| stringstream ss; // Both input and output, so need both get and put facets. |
| |
| ss.imbue(new_locale); |
| |
| double inf = numeric_limits<double>::infinity(); |
| ss << inf; // Write out. |
| double r; |
| ss >> r; // Read back in. |
| |
| assert(inf == r); // OK MSVC <= 10.0! |
| |
| } // int main() |
| |
| /* |
| |
| Output: |
| |
| nonfinite_loopback_ok.vcxproj -> J:\Cpp\fp_facet\fp_facet\Debug\nonfinite_loopback_ok.exe |
| |
| */ |
| |
| |