stringstream
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stringstream是字符串流。它将流与存储在内存中的string对象绑定起来。
在多种数据类型之间实现自动格式化
1 stringstream对象的使用
#include<sstream>#include<iostream>using namespace std;int main(){ string line,word; while(getline(cin,line)) { stringstream stream(line); cout<<stream.str()<<endl; while(stream>>word){cout<<word<<endl;}//stream相当于cin } return 0;}
输入:shanghai no1 school 1989
输出:shanghi no1 school 1989
shanghai
no1
school
1989
2stringstream提供的转换和格式化
#include<sstream>#include<iostream>using namespace std;int main(){ int val1 = 512,val2 =1024; stringstream ss; ss<<"val1: "<<val1<<endl //“val1: "此处有空格,字符串流是通过空格判断一个字符串的结束 <<"val2: "<<val2<<endl; cout<<ss.str(); string dump; int a,b; ss>>dump>>a >>dump>>b; cout<<a<<" "<<b<<endl; return 0;}
输出为:val1: 512
val2: 1024
512 1024
3其他注意
stringstream不会主动释放内存(或许是为了提高效率),但如果你要在程序中用同一个流,反复读写大量的数据,将会造成大量的内存消 耗,因些这时候,需要适时地清除一下缓冲 (用 stream.str(“”) )
#include <cstdlib>#include<iostream>#include<sstream>using namespace std;int main(){ stringstream ss; string s; ss<<"shanghai no1 school"; ss>>s; cout<<"size of stream = "<<ss.str().length()<<endl; cout<<"s: "<<s<<endl; ss.str(""); cout<<"size of stream = "<<ss.str().length()<<endl;}
输出:
size of stream = 19
s: shanghai
size of stream = 0
4. istringstream, ostringstream, stringstream用法示例
http://blog.chinaunix.net/uid-22214341-id-397883.html
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