stack

问题 my program should implement a threadsafe stack in c++ I get an error when I want to start the programm: Debug assertion Failed! ...\vector Line 1201 Expression: vector subscript out of range I absolutely don't know what's wrong with the code #include <condition_variable> #include <iostream> #include <memory> #include <mutex> #include <thread> #include <vector> #define NUM_ELEMENTS 10 using namespace std; class Stack { protected: vector<int> stack; int topOfStack; int maxSize; mutable mutex

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed last year . Can anyone help me to make a new menu to delete all the books that have been entered? And how to make the title, name, and language can be entered with space? I've searched other questions about it, many of them using getline. But i don't understand how to use it on class like this. (Sorry my grammar

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . Follow-Up: Please head over to this question where there are actually some useful answers. 回答1: Instead of objects, think of "simpler"

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . Recently I was trying to do some performance benchmarks, comparing std::stack<int, std::vector<int>> and my own simple implementation

问题 I'm trying to implement a stack on the heap using a linked list. However, for using the 'list' function I need to create a deep copy of the linked list, which i'm not completely sure how it's done. Here's a part of my code: class Stack { private: struct Node { int data; Node *next; }; Node *stackTop; public: Stack() {stackTop = nullptr;} Stack(const Stack& original); ~Stack(); bool isEmpty() const; int top() const; int pop(); void push(int newItem); }; Stack::~Stack() { delete stackTop; }

问题 I have been working with a web application. It was running fun until I changed tables which were behind the app. I checked my code, and it looked fine to me. But I am keep getting this error, and not sure why. Can someone help? [InvalidOperationException: Stack empty.] System.Collections.Generic.Stack`1.Pop() +8625191 System.Web.UI.RenderTraceListenerList.EndRendering(TextWriter writer, Object renderedObject) +90 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer,

问题 Hello I have a problem to returned variable from my pop function. I will be happy if you could help me. The function receives a pointer to the top of the list and should return the answer but I have a problem with a pointer to the list and intger the answer. Function Code - int pop(Node* top) { Node* tmp = top; int ans = tmp->next; top = top->next; delete tmp; return ans; } Node - struct Node { int num; Node* next; } Node* top = new Node; 回答1: The line int ans = tmp->next; appears to be the

问题 I could not understand that how can be the pointers same when the text size is equal. It seems like firstStringObj::c_str() overwrittes the previous one's pointer. #include <iostream> #include <string> #include <string> #include <stdio.h> std::string getConstCharAndModifyItWithANewString( const char* constchar ) { std::string stringAtStack( constchar ); stringAtStack += "::isModified"; return stringAtStack; } int main() { const char* firstConstCharPointer =

问题 I'm studying buffer overflow and solving some wargames. There was a problem that all of the stack memory above the buffer is set to 0 except return address of main, which will be: buffer [0000000...][RET][000000...] and I can overwrite that RET. So I found some hints for solving this problem. It was to use LD_PRELOAD. Some people said that LD_PRELOAD's value is in somewhere of stack not only in environment variable area of stack. So I set LD_PRELOAD and search it and found it using gdb. $

问题 I've seen this way of implementing a queue with two stacks: https://stackoverflow.com/a/2050402/494094 And I've read that this way the queue is immutable and thread-safe. What's the point that separates this from a normal queue and makes it immutable and thread-safe? I'd really appreciate it if someone could explain it in a simple, non-professional way. 回答1: How to implement a queue using two stacks? explains more and has some code. If you do this in a low-level way you will have two memory