C++ STL算法iter

函数原型

template inline
void iter_swap(_FwdIt1 _Left, _FwdIt2 _Right)

通过迭代器来完成元素的交换。

参数

 _Left，_Right指向要交换的两个迭代器

#include 
#include 
#include 
#include 
#include 
#include

int main()
{	
	std::vector a{1, 2, 4, 5, 8, 10};
	std::iter_swap(std::begin(a), std::begin(a) + 4);

	std::for_each(std::begin(a), std::end(a), [](int value) {
		std::cout << value << ", ";
	});
	std::cout << std::endl;

	return -1;
}

//输出
8, 2, 4, 5, 1, 10,

函数原型

template inline
_FwdIt2 swap_ranges(const _FwdIt1 _First1, const _FwdIt1 _Last1, _FwdIt2 _First2)

first1 last1 第一个容器首、尾迭代器

first2 第二个迭代器首

#include 
#include 
#include 
#include 
#include 
#include

int main()
{	
	std::vector a{ 3, 6, 4, 7, 8, 10 };
	std::vector b{ 2, 1, 3, 4, 10 };

	std::swap_ranges(std::begin(a), std::begin(a), std::begin(b));

	std::for_each(std::begin(a), std::end(a), [](int value) {
		std::cout << value << ", ";
	});
	std::cout << std::endl;

	std::for_each(std::begin(b), std::end(b), [](int value) {
		std::cout << value << ", ";
	});
	std::cout << std::endl;

	std::vector c(a.size());
	std::swap_ranges(std::begin(a), std::end(a), std::begin(c));

	std::for_each(std::begin(a), std::end(a), [](int value) {
		std::cout << value << ", ";
	});
	std::cout << std::endl;

	std::for_each(std::begin(c), std::end(c), [](int value) {
		std::cout << value << ", ";
	});
	std::cout << std::endl;

	return -1;
}

//输出
3, 6, 4, 7, 8, 10,
2, 1, 3, 4, 10,

0, 0, 0, 0, 0, 0,
3, 6, 4, 7, 8, 10,