C9 Lectures: Stephan T. Lavavej - Standard Template Library (STL) 2笔记

来源：互联网发布：java获取编码方式编辑：程序博客网时间：2024/06/06 02:50
#include <functional>//c++11#include<algorithm>//包括，remove and erase#include<iostream>#include<map>#include <ostream>#include<unordered_map>#include <string>#include <vector>using namespace std;/*-----------------------map的基本使用int main(){map<int,string> m;m[1]="one";m[2]="two";m[4]="four";m[3]="three";m[2]="TWO!";//cout<<m[2]<<endl;//right:for (auto i=m.begin();i!=m.end();++i){cout<<i->first<<" "<<i->second<<endl;}m.clear();}-------------------------------*//*------------------------------------------map在函数中的调用相关，不明问题1void foo(const map<int,string> &m){//m[7]="seven";//false;m is constcout<<m[3]<<endl;//                                               wrong:DONT KNOW !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!map<int,string>::const_iterator i=m.find(3);if (i==m.end()){cout<<"Not Found"<<endl;} else{cout<<i->second<<endl;}}int main(){map<int,string> m;m[1]="one";m[2]="two";m[4]="four";m[3]="three";m[2]="TWO!";//cout<<m[2]<<endl;//right:foo(m);for (auto i=m.begin();i!=m.end();++i){cout<<i->first<<" "<<i->second<<endl;}m.clear();}---------------------------------------*//*--------------------------------------boost库中的map ,按照hash_value判断，问题1,什么是hash_valueint main(){unordered_map<int,string> m;m[1]="one";m[2]="two";m[4]="four";m[3]="three";m[2]="TWO!";//cout<<m[2]<<endl;//right:for (auto i=m.begin();i!=m.end();++i){cout<<i->first<<" "<<i->second<<endl;}m.clear();}-------------------------*//*----------------------------c++11 包含 functional头文件后的使用，以后补充int main(){map<int,string,greater<int>> m;m[1]="one";m[2]="two";m[4]="four";m[3]="three";m[2]="TWO!";//cout<<m[2]<<endl;//right:for (auto i=m.begin();i!=m.end();++i){cout<<i->first<<" "<<i->second<<endl;}m.clear();}-------------------------------*//*-----------------------------使用functional 和 algorithm，对函数内容进行删减int main(){vector<int> v;v.push_back(11);v.push_back(22);v.push_back(33);v.push_back(44);v.push_back(55);v.erase(remove_if(v.begin(),v.end(),[](int e){return e%2==1;}),v.end());for (auto i=v.begin();i!=v.end();++i){cout<<*i<<endl;}v.clear();}--------------------------------------*/
0 0