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random (variate_generator<>::min, [...]): Return non-trivial values when _Engine_result_type is a floating point type and...

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2007-11-03  Paolo Carlini  <pcarlini@suse.de>
	    Kai-Uwe Bux  <bux@kubux.net>

	* include/tr1_impl/random (variate_generator<>::min, max,
	operator()()): Return non-trivial values when _Engine_result_type
	is a floating point type and result_type is an integer type.

Co-Authored-By: Kai-Uwe Bux <bux@kubux.net>

From-SVN: r129875
This commit is contained in:
Paolo Carlini 2007-11-03 23:27:55 +00:00 committed by Paolo Carlini
parent 83dffdeb44
commit 202d1d5f54
2 changed files with 41 additions and 31 deletions
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7
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,10 @@
2007-11-03 Paolo Carlini <pcarlini@suse.de>
Kai-Uwe Bux <bux@kubux.net>
* include/tr1_impl/random (variate_generator<>::min, max,
operator()()): Return non-trivial values when _Engine_result_type
is a floating point type and result_type is an integer type.
2007-11-02 Paolo Carlini <pcarlini@suse.de>
* include/bits/stl_algo.h (minmax, minmax_element): Add.

65
libstdc++-v3/include/tr1_impl/random
View File

@ -89,11 +89,11 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
result_type
min() const
{
result_type __return_value = 0;
result_type __return_value;
if (is_integral<_Engine_result_type>::value
&& is_integral<result_type>::value)
__return_value = _M_g.min();
else if (!is_integral<result_type>::value)
else
__return_value = result_type(0);
return __return_value;
}
@ -101,48 +101,51 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
result_type
max() const
{
result_type __return_value = 0;
result_type __return_value;
if (is_integral<_Engine_result_type>::value
&& is_integral<result_type>::value)
__return_value = _M_g.max();
else if (!is_integral<result_type>::value)
__return_value = result_type(1);
else
__return_value = std::numeric_limits<result_type>::max() - 1;
return __return_value;
}
/*
* Converts a value generated by the adapted random number generator
* into a value in the input domain for the dependent random number
* distribution.
*
* Because the type traits are compile time constants only the
* appropriate clause of the if statements will actually be emitted
* by the compiler.
*/
result_type
operator()();
operator()()
{
result_type __return_value;
if (is_integral<_Engine_result_type>::value
&& is_integral<result_type>::value)
__return_value = _M_g();
else if (!is_integral<_Engine_result_type>::value
&& !is_integral<result_type>::value)
__return_value = result_type(_M_g() - _M_g.min())
/ result_type(_M_g.max() - _M_g.min());
else if (is_integral<_Engine_result_type>::value
&& !is_integral<result_type>::value)
__return_value = result_type(_M_g() - _M_g.min())
/ result_type(_M_g.max() - _M_g.min() + result_type(1));
else
__return_value = (((_M_g() - _M_g.min())
/ (_M_g.max() - _M_g.min()))
* std::numeric_limits<result_type>::max());
return __return_value;
}
private:
_Engine _M_g;
};
/*
* Converts a value generated by the adapted random number generator into a
* value in the input domain for the dependent random number distribution.
*
* Because the type traits are compile time constants only the appropriate
* clause of the if statements will actually be emitted by the compiler.
*/
template<typename _Engine, typename _Distribution>
typename _Adaptor<_Engine, _Distribution>::result_type
_Adaptor<_Engine, _Distribution>::
operator()()
{
result_type __return_value = 0;
if (is_integral<_Engine_result_type>::value
&& is_integral<result_type>::value)
__return_value = _M_g();
else if (is_integral<_Engine_result_type>::value
&& !is_integral<result_type>::value)
__return_value = result_type(_M_g() - _M_g.min())
/ result_type(_M_g.max() - _M_g.min() + result_type(1));
else if (!is_integral<_Engine_result_type>::value
&& !is_integral<result_type>::value)
__return_value = result_type(_M_g() - _M_g.min())
/ result_type(_M_g.max() - _M_g.min());
return __return_value;
}
} // namespace __detail
/**