istringstream在C ++ [英] istringstream in C++

问题描述

我相信我只是在这里做一些蠢事，但我不能弄清楚它是什么。当我尝试运行此代码：

I'm sure I'm just doing something stupid here, but I can't quite figure out what it is. When I try to run this code:

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int main(int argc, char *argv[])
{
 string s("hello");

 istringstream input(s, istringstream::in);

 string s2;
 input >> s2;

 cout << s;
}

我收到此错误：

malloc: *** error for object 0x100016200: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

我可以想到的唯一的事情是我在堆栈上分配了s2，但我认为字符串在堆上管理自己的内容。

The only thing I can think of is that I allocated s2 on the stack, but I thought strings manage their own content on the heap. Any help here would be appreciated.

感谢，

helixed

EDIT：修复main的最后一行，其中 cout< s 本应该是 cout<< s2 。如果我将s2初始化为hi，但没有其他错误，它运行没有错误。这是一个奇怪的gcc编译问题？

Fixed the last line of main, where cout << s should have been cout << s2. It runs without error if I initialized s2 to "hi", but not otherwise. Is this just a weird gcc compilation problem?

推荐答案

适用于我。

但我从来没有这样做：

istringstream input(s, istringstream::in); 

尝试

istringstream input(s); 

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