我可以更改分配参数吗? [英] Can I change a distribution parameters?

问题描述

<随机> 创建该对象时，我要定义一个时间间隔. 创建后可以更改此间隔吗?

There is uniform_int_distribution in < random > When I creating that I define an interval. Can I change this interval after the creation?

例如

std::uniform_int_distribution distr(0, 10);
// can I change an interval here ?    

推荐答案

只需为变量分配新的分布:

Just assign a new distribution to the variable:

std::uniform_int_distribution<int> distr(0, 10);

distr = std::uniform_int_distribution<int>(5, 13);

或者，为此创建一个参数(@awesomeyi回答需要创建分发对象，但这仍然需要param_type对象创建)

Or, create a parameter for that (@awesomeyi answer required distribution object creation, this still requires param_type object creation)

std::uniform_int_distribution<int> distr(0, 10); 

distr.param(std::uniform_int_distribution<int>::param_type(5, 13));

证明param_type可以工作(对于@stefan):

Proof that param_type will work (for @stefan):

P是关联的param_type.它应满足 CopyConstructible，CopyAssignable和EqualityComparable 要求.它还具有采用以下相同参数的构造函数: 与D的构造函数相同的类型，并具有成员函数 与D的参数返回获取器相同

P is the associated param_type. It shall satisfy the CopyConstructible, CopyAssignable, and EqualityComparable requirements. It also has constructors that take the same arguments of the same types as the constructors of D and has member functions identical to the parameter-returning getters of D

http://en.cppreference.com/w/cpp/concept/RandomNumberDistribution

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