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| author | Paolo Carlini <pcarlini@suse.de> | 2007-11-03 23:27:55 +0000 |
|---|---|---|
| committer | Paolo Carlini <paolo@gcc.gnu.org> | 2007-11-03 23:27:55 +0000 |
| commit | 202d1d5f54c5cb27b90358ac754acbea5697e40a (patch) | |
| tree | ed31fce3c8c55d5b58038fb0e13e19cd1a5645c4 /libstdc++-v3/include | |
| parent | 83dffdeb44589d502a1e21fc19380bc27e7dfc54 (diff) | |
| download | gcc-202d1d5f54c5cb27b90358ac754acbea5697e40a.zip gcc-202d1d5f54c5cb27b90358ac754acbea5697e40a.tar.gz gcc-202d1d5f54c5cb27b90358ac754acbea5697e40a.tar.bz2 | |
random (variate_generator<>::min, [...]): Return non-trivial values when _Engine_result_type is a floating point type and...
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
Diffstat (limited to 'libstdc++-v3/include')
| -rw-r--r-- | libstdc++-v3/include/tr1_impl/random | 65 |
1 files changed, 34 insertions, 31 deletions
diff --git a/libstdc++-v3/include/tr1_impl/random b/libstdc++-v3/include/tr1_impl/random index 4ce7d8b..02ad85a 100644 --- a/libstdc++-v3/include/tr1_impl/random +++ b/libstdc++-v3/include/tr1_impl/random @@ -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 /** |