我正在尝试使用ptr_vector来存储一些指针,但是一旦我的main方法出现错误。
这是我的代码:
int main(void)
{
boost::ptr_vector<string> temp;
string s1 = "hi";
string s2 = "hello";
temp.push_back(&s1);
temp.push_back(&s2);
return 0;
}
这是我收到的错误消息:
Critical error detected c0000374
Windows has triggered a breakpoint in Path_Tree.exe.
This may be due to a corruption of the heap, which indicates a bug in Path_Tree.exe or any of the DLLs it has loaded.
This may also be due to the user pressing F12 while Path_Tree.exe has focus.
The output window may have more diagnostic information.
The program '[7344] Path_Tree.exe: Native' has exited with code 0 (0x0).
我究竟做错了什么?
谢谢!
最佳答案
ptr_vector
拥有您为其赋予的指针所指向的对象的所有权(意味着在完成对它们的调用后,它会在这些指针上调用delete
)。如果只需要一个指针 vector ,请使用:
int main()
{
std::vector<string*> temp;
//s1 and s2 manage their own lifetimes
//(and will be destructed at the end of the scope)
string s1 = "hi";
string s2 = "hello";
//temp[0] and temp[1] point to s1 and s2 respectively
temp.push_back(&s1);
temp.push_back(&s2);
return 0;
}
否则,您应该使用new分配您的字符串,然后push_back得到的指针:
int main()
{
boost::ptr_vector<string> temp;
temp.push_back(new string("hi"));
temp.push_back(new string("hello"));
return 0;
}
如果只需要一个字符串容器,则通常是字符串 vector :
int main()
{
std::vector<string> temp;
//s1 and s2 manage their own lifetimes
//(and will be destructed at the end of the scope)
string s1 = "hi";
string s2 = "hello";
//temp[0] and temp[1] refer to copies of s1 and s2.
//The vector manages the lifetimes of these copies,
//and will destroy them when it goes out of scope.
temp.push_back(s1);
temp.push_back(s2);
return 0;
}
ptr_vector
旨在使具有值语义的多态对象更容易。如果您的字符串最初不是多态的,那么就完全不需要ptr_vector
了。关于c++ - ptr_vector没有正确释放,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/11972133/