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add normal_distribution::stddev

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bolero-MURAKAMI 2012-11-16 13:40:19 +09:00
parent 225c11b505
commit f37e8a9088
19 changed files with 261 additions and 211 deletions
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21
sprout/random/linear_feedback_shift.hpp
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@ -29,16 +29,17 @@ namespace sprout {
static_assert(k < w, "k < w");
static_assert(0 < 2 * q && 2 * q < k, "0 < 2 * q && 2 * q < k");
static_assert(0 < s && s <= k - q, "0 < s && s <= k - q");
public:
static SPROUT_CONSTEXPR result_type static_min() SPROUT_NOEXCEPT {
return 0;
}
static SPROUT_CONSTEXPR result_type static_max() SPROUT_NOEXCEPT {
return wordmask();
}
private:
static SPROUT_CONSTEXPR UIntType wordmask() {
return sprout::detail::low_bits_mask_t<w>::sig_bits;
}
static SPROUT_CONSTEXPR result_type static_min() {
return 0;
}
static SPROUT_CONSTEXPR result_type static_max() {
return wordmask();
}
static SPROUT_CONSTEXPR UIntType init_seed_1(UIntType const& x0) {
return x0 < (1 << (w - k)) ? x0 + (1 << (w - k)) : x0;
}
@ -64,19 +65,19 @@ namespace sprout {
explicit SPROUT_CONSTEXPR linear_feedback_shift_engine(UIntType const& x0)
: x_(init_seed(x0))
{}
SPROUT_CONSTEXPR result_type min() const {
SPROUT_CONSTEXPR result_type min() const SPROUT_NOEXCEPT {
return static_min();
}
SPROUT_CONSTEXPR result_type max() const {
SPROUT_CONSTEXPR result_type max() const SPROUT_NOEXCEPT {
return static_max();
}
SPROUT_CONSTEXPR sprout::random::random_result<linear_feedback_shift_engine> operator()() const {
return generate(((x_ & ((wordmask() << (w - k)) & wordmask())) << s) ^ ((((x_ << q) ^ x_) & wordmask()) >> (k - s)));
}
friend SPROUT_CONSTEXPR bool operator==(linear_feedback_shift_engine const& lhs, linear_feedback_shift_engine const& rhs) {
friend SPROUT_CONSTEXPR bool operator==(linear_feedback_shift_engine const& lhs, linear_feedback_shift_engine const& rhs) SPROUT_NOEXCEPT {
return lhs.x_ == rhs.x_;
}
friend SPROUT_CONSTEXPR bool operator!=(linear_feedback_shift_engine const& lhs, linear_feedback_shift_engine const& rhs) {
friend SPROUT_CONSTEXPR bool operator!=(linear_feedback_shift_engine const& lhs, linear_feedback_shift_engine const& rhs) SPROUT_NOEXCEPT {
return !(lhs == rhs);
}
template<typename Elem, typename Traits>