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https://github.com/saitohirga/WSJT-X.git
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66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
// Copyright John Maddock 2007.
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// Copyright Paul A. Bristow 2010
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <iostream>
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using std::cout; using std::endl;
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#include <cerrno> // for ::errno
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//[policy_eg_2
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#include <boost/math/special_functions/gamma.hpp>
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using boost::math::tgamma;
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int main()
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{
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// using namespace boost::math::policies; // or
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using boost::math::policies::errno_on_error;
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using boost::math::policies::make_policy;
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using boost::math::policies::pole_error;
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using boost::math::policies::domain_error;
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using boost::math::policies::overflow_error;
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using boost::math::policies::evaluation_error;
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errno = 0;
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std::cout << "Result of tgamma(30000) is: "
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<< boost::math::tgamma(
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30000,
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make_policy(
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domain_error<errno_on_error>(),
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pole_error<errno_on_error>(),
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overflow_error<errno_on_error>(),
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evaluation_error<errno_on_error>()
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)
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) << std::endl;
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// Check errno was set:
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std::cout << "errno = " << errno << std::endl;
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// and again with evaluation at a pole:
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std::cout << "Result of tgamma(-10) is: "
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<< boost::math::tgamma(
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-10,
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make_policy(
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domain_error<errno_on_error>(),
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pole_error<errno_on_error>(),
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overflow_error<errno_on_error>(),
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evaluation_error<errno_on_error>()
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)
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) << std::endl;
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// Check errno was set:
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std::cout << "errno = " << errno << std::endl;
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}
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//] //[/policy_eg_2]
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/*
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Output:
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Result of tgamma(30000) is: 1.#INF
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errno = 34
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Result of tgamma(-10) is: 1.#QNAN
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errno = 33
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*/
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