C++ 概念: RandomNumberDistribution
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一个
i).
RandomNumberDistribution是一个函数对象,根据返回的随机数概率密度函数p(x)或离散概率分布P(xi).
[编辑] 要求
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D是一个类的RandomNumberDistribution要求。它也应满足CopyConstructible和CopyAssignable要求.原文:Dis a class meeting theRandomNumberDistributionrequirements. It shall also satisfy theCopyConstructibleandCopyAssignablerequirements. -
T是关联result_type. -
P是相关联的param_type。它应满足CopyConstructible,CopyAssignable,EqualityComparable要求.原文:Pis the associatedparam_type. It shall satisfy theCopyConstructible,CopyAssignable, andEqualityComparablerequirements. -
d一个目的是D和x,y潜在const对象D.原文:dis an object ofDandx,yare potentially const objects ofD. -
p可能是一个恒定值,P. -
os是一个左值的std::basic_ostream的原文:osis an lvalue of std::basic_ostream. -
is是一个左值的std::basic_istream的原文:isis an lvalue of std::basic_istream.
| Expression | Type | Notes | Complexity |
|---|---|---|---|
D::result_type |
T |
An arithmetic type | compile-time |
D::param_type |
P |
compile-time | |
D() |
constant | ||
D(p) |
Same as p's construction
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d.reset() |
void |
Resets the internal state of the distribution object. After a call to this function, the next call to operator() on the distribution object will not be dependent on previous calls to operator(). |
constant |
x.param() |
P |
No worse than D(p)
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d.param(p) |
void |
No worse than D(p)
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d(g) |
T |
d(g, d.param()) |
Same as d(g, d.param())
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d(g,p) |
T |
When called with the same g and p parameter it returns a sequence of numbers distributed according to p(x;p) or P(xi; p) |
Amortized constant number of incovations of g
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x.min() |
T |
The greatest lower bound returned by operator() |
constant |
x.max() |
T |
The least upper bound returned by operator() |
constant |
x == y |
bool |
constant | |
y != y |
bool |
!(x == y) |
constant |
os << x |
Reference to the type of os |
Writes a textual representation of the distribution parameters and internal state to os as textual representation. The formatting flags and fill character of os are unchanged. |
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is >> d |
Reference to the type of is |
Restores the distribution parameters and internal state with data read from is. The formatting flags of is are unchanged. The data must have been written using a stream with the same locale, CharT and Traits template parameters, otherwise the behavior is undefined. If bad input is encountered, is.setstate(std::ios::failbit) is called, which may throw std::ios_base::failure. d is unchanged in that case. |