[英]How can I declare a stack reference in C++11?
我正在實現堆棧參考。 但是我得到了“分段錯誤(核心已轉儲)”的錯誤。 我在Ubuntu 14.04上使用g ++(Ubuntu 4.8.2-19ubuntu1)4.8.2。 非常感謝。
該代碼在下面列出。
#include<iostream>
#include<stack>
using namespace std;
int main() {
stack<int>* S;
S->push(4);
return 0;
}
盡可能停止使用new
。
#include <iostream>
#include <stack>
int main() {
std::stack<int> s;
s.push(4);
return 0;
}
通常不建議使用代表對象所有權的“裸”指針,因為它容易出錯。 要么使用自動變量,要么使用庫提供的智能指針。
#include <stack>
#include <memory>
int main()
{
// On the stack, local scope. This is the fastest;
// unlike Java we don't have to "new" everything.
std::stack<int> s1;
s1.push(4);
// Dynamically allocated, gets auto-deleted when the
// last copy of the smartpointer goes out of scope.
// Has some overhead, but not much.
// Requires some extra plumbing if used on arrays.
auto s2 = std::make_shared<std::stack<int>>();
auto s2_copy(s2); // can be copied
s2->push(4);
// Dynamically allocated, gets auto-deleted when the
// smartpointer goes out of scope. No overhead, but
// cannot be copied / shared.
// Works out-of-the-box with arrays as well.
auto s3 = std::make_unique<std::stack<int>>();
s3->push(4);
}
您必須創建對象,然后可以指向它。
#include<iostream>
#include<stack>
using namespace std;
int main() {
stack<int> s;
stack<int>& S = s;
S.push(4);
return 0;
}
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