是否有一些类似于 srand()
的函数,我需要调用它来确保 std::random_shuffle()
总是产生不同的结果?即如果我用相同的数据多次调用它,我希望每次的顺序都不同.我如何确保这一点?
Is there some function, similar to srand()
, that I need to call to make sure that std::random_shuffle()
always produces different results? i.e. if I call it several times with the same data, I want the order to be different every time. How can I make sure of that?
std::random_shuffle
有两种形式.一个接受 2 个参数(开始/结束迭代器),一个接受 3 个参数(开始/结束迭代器和一个随机生成器).
std::random_shuffle
has two forms. One that takes 2 arguments (begin/end iterators), and one that takes 3 (begin/end iterator and a random generator).
第一种形式使用 std::rand()
,因此您将使用 std::srand()
为其随机数生成器提供种子.您也可以使用 3 参数版本并自己提供 RNG.
The first form uses std::rand()
, so you would use std::srand()
to seed it's random number generator. You can also use the 3-argument version and provide the RNG yourself.
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