C ++ STL中的set :: erase()函数
C++STLset::erase()函数
set::erase()函数是预定义的函数，用于删除集合中的元素。
原型：
set<T> st; //声明
set<T>::iterator it; //迭代器声明
st.erase( const T item); //原型1-
or
st.erase(iterator position) //原型2-参数：
const T item; //原型1-
Or
Iterator position //原型2-返回类型：
size_type //原型1-
Or
void //原型2-用法：该函数用于根据元素的值或元素在集合中的迭代器位置来擦除它
示例
For a set of integer,
set<int> st;
set<int>::iterator it;
st.insert(4);
st.insert(5);
set content:
4
5
st.erase(4);
set content:
5
st.erase(st.begin()); //擦除5-
set content:
empty set包含的头文件：
#include <iostream>
#include <set>
OR
#include <bits/stdc++.h>C++实现：
#include <bits/stdc++.h>
using namespace std;
void printSet(set<int> st){
set<int>:: iterator it;
cout<<"Set contents are:\n";
for(it=st.begin();it!=st.end();it++)
cout<<*it<<" ";
cout<<endl;
}
int main(){
cout<<"Example of erase function\n";
set<int> st;
set<int>:: iterator it;
cout<<"inserting 4\n";
st.insert(4);
cout<<"inserting 6\n";
st.insert(6);
cout<<"inserting 10\n";
st.insert(10);
printSet(st); //打印当前设置
cout<<"erasing 6..\n";
st.erase(6); //原型1-
cout<<"After erasing 6...\n";
printSet(st);
cout<<"erasing first element of the set now\n";
st.erase(st.begin());//原型2-
cout<<"after erasing first element of set now\n";
printSet(st);
return 0;
}输出结果
Example of erase function inserting 4 inserting 6 inserting 10 Set contents are: 4 6 10 erasing 6.. After erasing 6... Set contents are: 4 10 erasing first element of the set now after erasing first element of set now Set contents are: 10