存储顺序递增
分配val的[first，last]个连续值范围内的每个元素，就像在写入每个元素之后以++ val递增。
模板：
void iota (ForwardIterator first, ForwardIterator last, T val);
参数：
first, last
Forward iterators to the initial and final positions of the sequence
to be written. The range used is [first, last), which contains all the
elements between first and last, including the element pointed by
first but not the element pointed by last.
val
Initial value for the accumulator.
返回类型：
None
// CPP program to illustrate
// std::iota
#include // std::cout
#include // std::iota
// Driver code
int main()
{
int numbers[10];
// Initailising starting value as 100
int st = 100;
std::iota(numbers, numbers + 10, st);
std::cout << "Elements are:";
for (auto i:numbers)
std::cout << ' ' << i;
std::cout << '\n';
return 0;
}
输出：
Elements are:100 101 102 103 104 105 106 107 108 109
应用：
它可用于生成连续的数字序列。
// CPP program to generate
// a sequence of numbers using std::iota
#include // std::cout
#include // std::iota
// Driver code
int main()
{
int numbers[11];
// Initailising starting value as 10
int st = 10;
std::iota(numbers, numbers + 11, st);
std::cout << "Elements are:";
for (auto i:numbers)
std::cout << ' ' << i;
std::cout << '\n';
return 0;
}
输出：
Elements are:10 11 12 13 14 15 16 17 18 19 20
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