std::iota

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C++
 
算法库
功能
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Functions
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修改序列操作
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Non-modifying sequence operations
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all_of
any_of
none_of		（C++11）
（C++11）
（C++11）
for_each
count
count_if
mismatch
equal
修改序列操作
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Modifying sequence operations
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分区操作
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Partitioning operations
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is_partitioned（C++11）
partition
partition_copy（C++11）
排序操作（排序的区间）
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Sorting operations (on sorted ranges)
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is_sorted（C++11）
is_sorted_until（C++11）
sort
二进制搜索操作（排序的区间）
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Binary search operations (on sorted ranges)
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设置操作（排序的区间）
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Set operations (on sorted ranges)
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堆的操作
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Heap operations
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最小/最大操作
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Minimum/maximum operations
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数字操作
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Numeric operations
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iota（C++11）
accumulate
inner_product
C库
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C library
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Defined in header <numeric>
template< class ForwardIterator, class T >
void iota( ForwardIterator first, ForwardIterator last, T value );
 （C++11 起）
[first, last)依次增加值填充的范围内，开始与value和反复评估++value.
Original:
Fills the range [first, last) with sequentially increasing values, starting with value and repetitively evaluating ++value.
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相同的操作
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Equivalent operation:
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*(d_first)   = value;
*(d_first+1) = ++value;
*(d_first+2) = ++value;
*(d_first+3) = ++value;
...

目录

[编辑] 参数

first, last -
元素的范围总和
Original:
the range of elements to sum
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value -
存储的初始值，则表达式+ +值必须很好地形成
Original:
initial value to store, the expression ++value must be well-formed
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[编辑] 返回值

（无）
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(none)
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[编辑] 复杂性

究竟last - first增量和任务.
Original:
Exactly last - first increments and assignments.
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[编辑] 可能的实现

template<class ForwardIterator, class T>
void iota(ForwardIterator first, ForwardIterator last, T value)
{
    while(first != last) {
        *first++ = value;
        ++value;
    }
}

[编辑] 为例

以下示例适用于std::random_shuffle一个向量的迭代器到std::liststd::random_shuffle可以被应用到std::list。 std::iota被用于创建矢量.
Original:
The following example applies std::random_shuffle to a vector of iterators to a std::list since std::random_shuffle cannot be applied to an std::list directly. std::iota is used to create the vector.
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#include <numeric>
#include <algorithm>
#include <list>
#include <vector>
#include <iostream>
 
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::random_shuffle(v.begin(), v.end());
 
    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';
}

Output: 

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

[编辑] 另请参阅
分配一个一定值范围内的元素
Original:
assigns a range of elements a certain value
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（函数模板） [edit]
并将结果保存在一个范围内的功能
Original:
saves the result of a function in a range
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（函数模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/algorithm/iota&oldid=30140”