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PR libstdc++/83833 fix chi_squared_distribution::param(const param&) 

PR libstdc++/83833
	* include/bits/random.h (chi_squared_distribution::param): Update
	gamma distribution parameter.
	* testsuite/26_numerics/random/chi_squared_distribution/83833.cc: New
	test.

From-SVN: r256708
This commit is contained in:
Jonathan Wakely 2018-01-15 19:58:22 +00:00 committed by Jonathan Wakely
parent 97a78e3396
commit 8b3085e7e8
3 changed files with 51 additions and 1 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,5 +1,11 @@
2018-01-15 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/83833
* include/bits/random.h (chi_squared_distribution::param): Update
gamma distribution parameter.
* testsuite/26_numerics/random/chi_squared_distribution/83833.cc: New
test.
PR libstdc++/83830
* include/std/type_traits (has_unique_object_representations_v): Add
variable template.

7
libstdc++-v3/include/bits/random.h
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@ -2643,7 +2643,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
*/
void
param(const param_type& __param)
{ _M_param = __param; }
{
_M_param = __param;
typedef typename std::gamma_distribution<result_type>::param_type
param_type;
_M_gd.param(param_type{__param.n() / 2});
}
/**
* @brief Returns the greatest lower bound value of the distribution.

39
libstdc++-v3/testsuite/26_numerics/random/chi_squared_distribution/83833.cc Normal file
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@ -0,0 +1,39 @@
// Copyright (C) 2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do run { target c++11 } }
#include <random>
#include <testsuite_hooks.h>
void
test01()
{
std::default_random_engine r1, r2;
using chi = std::chi_squared_distribution<double>;
chi::param_type p(5);
chi d1(p);
chi d2;
d2.param(p);
VERIFY( d1(r1) == d2(r2) ); // PR libstdc++/83833
}
int
main()
{
test01();
}