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我想了解C++中stringstream的細節。但是當我嘗試重新輸入stringstream對象時(「< <」),我發現了一個麻煩。 (即obj的內容仍然保持不變)。我的代碼如下。輸出顯示在評論中。C++:爲什麼重新輸入stringstream不起作用?內容保持不變
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main()
{
stringstream sso;
cout <<"orginal: " << sso.str() <<endl; //orginal:"empty"
sso << "A" << " " << "B" << " " << "C";
cout <<"flowin:" << sso.str() <<endl; //flowin:A B C
string r1, r2, r3;
sso >> r1 >> r2 >> r3;
cout << "flowout:" << r1 << r2 << r3 << endl;//flowout:ABC
cout << "base: " << sso.str() << endl; //base: A B C
cout << "----problem here-----" << endl;
sso << "D" << " " << "E" << " " << "F";
cout <<"flowin:" << sso.str() <<endl; //flowin:A B C
cout << "----this works-----" << endl;
sso.clear(); //clear flag
sso.str(""); //clear content
sso << "D" << " " << "E" << " " << "F";
cout <<"flowin:" << sso.str() <<endl; //flowin:D E F
return 0;
}
爲什麼?我不明白「---這裏---問題---」的結果。爲什麼sso不接受新的輸入?
Apprecited,
非常感謝。 :) –