std::iota
STD：：IATA
| Defined in header | | |
|---|---|---|
| template< class ForwardIterator, class T > void iota( ForwardIterator first, ForwardIterator last, T value | | (since C++11) |
填充范围[first, last)value++value...
等效操作：
二次
*(d_first) = value;
*(d_first+1) = ++value;
*(d_first+2) = ++value;
*(d_first+3) = ++value;
...
二次
参数
| first, last | - | the range of elements to fill with sequentially increasing values starting with value |
|---|---|---|
| value | - | initial value to store, the expression ++value must be well-formed |
返回值
%280%29
复杂性
一点儿没错last - first
可能的实施
%2A第一++=值；++值；}
*。
注记
例
std::shuffle的向量std::list迭代器std::shuffle不能应用于std::list直接。std::iota用于填充两个容器。
二次
#include <algorithm>
#include <iostream>
#include <list>
#include <numeric>
#include <random>
#include <vector>
int main()
{
std::list<int> l(10
std::iota(l.begin(), l.end(), -4
std::vector<std::list<int>::iterator> v(l.size()
std::iota(v.begin(), v.end(), l.begin()
std::shuffle(v.begin(), v.end(), std::mt19937{std::random_device{}()}
std::cout << "Contents of the list: ";
for(auto n: l) std::cout << n << ' ';
std::cout << '\n';
std::cout << "Contents of the list, shuffled: ";
for(auto i: v) std::cout << *i << ' ';
std::cout << '\n';
}
二次
可能的产出：
二次
Contents of the list: -4 -3 -2 -1 0 1 2 3 4 5
Contents of the list, shuffled: 0 -1 3 4 -4 1 -2 -3 2 5
二次
另见
| fill | copy-assigns the given value to every element in a range (function template) |
|---|---|
| generate | assigns the results of successive function calls to every element in a range (function template) |
© cppreference.com
在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。
