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add normal_distribution::stddev

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This commit is contained in:
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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41
sprout/random/additive_combine.hpp
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@ -16,18 +16,27 @@ namespace sprout {
template<typename MLCG1, typename MLCG2>
class additive_combine_engine {
public:
typedef MLCG1 first_base;
typedef MLCG2 second_base;
typedef typename first_base::result_type result_type;
typedef MLCG1 base1_type;
typedef MLCG2 base2_type;
typedef base1_type first_base;
typedef base2_type second_base;
typedef typename base1_type::result_type result_type;
private:
static SPROUT_CONSTEXPR result_type static_min() SPROUT_NOEXCEPT {
return 1;
}
static SPROUT_CONSTEXPR result_type static_max() SPROUT_NOEXCEPT {
return base1_type::modulus - 1;
}
public:
struct private_constructor_tag {};
private:
first_base mlcg1_;
second_base mlcg2_;
base1_type mlcg1_;
base2_type mlcg2_;
private:
SPROUT_CONSTEXPR additive_combine_engine(
first_base const& mlcg1,
second_base const& mlcg2,
base1_type const& mlcg1,
base2_type const& mlcg2,
private_constructor_tag
)
: mlcg1_(mlcg1)
@ -38,7 +47,7 @@ namespace sprout {
return sprout::random::random_result<additive_combine_engine>(
rnd2.result() < rnd1.result()
? rnd1.result() - rnd2.result()
: rnd1.result() - rnd2.result() + first_base::modulus - 1
: rnd1.result() - rnd2.result() + base1_type::modulus - 1
,
additive_combine_engine(
rnd1.engine(),
@ -60,19 +69,25 @@ namespace sprout {
: mlcg1_(seed1)
, mlcg2_(seed2)
{}
SPROUT_CONSTEXPR result_type min() const {
SPROUT_CONSTEXPR result_type min() const SPROUT_NOEXCEPT {
return 1;
}
SPROUT_CONSTEXPR result_type max() const {
return first_base::modulus - 1;
SPROUT_CONSTEXPR result_type max() const SPROUT_NOEXCEPT {
return base1_type::modulus - 1;
}
SPROUT_CONSTEXPR sprout::random::random_result<additive_combine_engine> operator()() const {
return generate(mlcg1_(), mlcg2_());
}
friend SPROUT_CONSTEXPR bool operator==(additive_combine_engine const& lhs, additive_combine_engine const& rhs) {
SPROUT_CONSTEXPR base1_type const& base1() const SPROUT_NOEXCEPT {
return mlcg1_;
}
SPROUT_CONSTEXPR base2_type const& base2() const SPROUT_NOEXCEPT {
return mlcg2_;
}
friend SPROUT_CONSTEXPR bool operator==(additive_combine_engine const& lhs, additive_combine_engine const& rhs) SPROUT_NOEXCEPT {
return lhs.mlcg1_ == rhs.mlcg1_ && lhs.mlcg2_ == rhs.mlcg2_;
}
friend SPROUT_CONSTEXPR bool operator!=(additive_combine_engine const& lhs, additive_combine_engine const& rhs) {
friend SPROUT_CONSTEXPR bool operator!=(additive_combine_engine const& lhs, additive_combine_engine const& rhs) SPROUT_NOEXCEPT {
return !(lhs == rhs);
}
template<typename Elem, typename Traits>