为什么std :: shuffle方法在C ++ 14中被弃用？ [英] Why are std::shuffle methods being deprecated in C++14?

问题描述

根据 cppreference.com 参考网站 std :: shufle ，以下方法在c ++ 14中已被弃用：

According to the cppreference.com reference site on std::shufle, the following method is being deprecated in c++14:

template< class RandomIt >
void random_shuffle( RandomIt first, RandomIt last );

为什么我们不能再传递第三个参数， >

Why will we no longer be able to call the following function without passing a third parameter?

std::random_shuffle(v.begin(),v.end()); //no longer valid in c++14

它不像一个不同的函数减速具有默认参数集。这背后的原因是什么？

It doesn't appear as though a different function deceleration has a default parameter set. What is the reason behind this? Was there some kind of alternative added?

推荐答案

std :: random_shuffle 可以使用随机 C系列函数。这些函数对种子和其他状态使用全局状态。

std::random_shuffle may make use, under the hood, of random C family of functions. These functions use global state for seeds and other state.

所以它被弃用，因为 shuffle 会做同样的，但更好。也就是说，它使用来自C ++ 11的不使用全局状态的新的< random> 头，但是它自己的对象使用生成器，设备和分布。

So it is being deprecated because shuffle will do the same, but better. Namely, it uses the new <random> header from C++11 that doesn't use global state, but its own objects making use of generators, devices and distributions.

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