set集合find()函数运用实例

find函数

语法:find

1 2	iterator find(const key_type& __x); const_iterator find(const key_type& __x) const;

find()返回一个指向被查找到元素的迭代器

源代码

// _GLIBCXX_RESOLVE_LIB_DEFECTS

// 214. set::find() missing const overload

//@{

/**

* @brief Tries to locate an element in a %set.

* @param x Element to be located.

* @return Iterator pointing to sought-after element, or end() if not

* found.

* This function takes a key and tries to locate the element with which

* the key matches. If successful the function returns an iterator

* pointing to the sought after element. If unsuccessful it returns the

* past-the-end ( @c end() ) iterator.

iterator

find(const key_type& __x)

{ return _M_t.find(__x); }

const_iterator

find(const key_type& __x) const

{ return _M_t.find(__x); }

测试代码

// 梁笔记

// https://zouzhongliang.com

#include <iostream>

#include <set>

using namespace std;

int main()

{

set<int> s1;

s1.insert(10);

s1.insert(12);

s1.insert(13);

s1.insert(9);

//iterator find(const key_type& __x);

set<int>::iterator iter = s1.find(9);

cout<<*iter<<endl;

//const_iterator find(const key_type& __x) const;

set<int>::const_iterator iter1 = s1.find(9);

cout<<*iter1<<endl;

}

测试结果：