I was looking at my C++ textbook at an example of a Linked List function for inserting a new node in the list which is below…. Void NumberList::insertNode(double num) { ListNode *newNode; //A new node ListNode *nodePtr; //To transverse the list ListNode *previousNode = nullptr; //The previous node //Allocate a new node and store num ..
Category : insert
I understand the general differences between insert and emplace_back for std::vector and std::list. Normally, I would just use emplace_back any time I want to append an element. For some applications, I need to append the element and have an iterator pointing to that newly appended element. So typically, I’ve been doing something like: // for ..
In Item 41 from Effective Modern C++, the following is one of the situations that give a chance for emplacement functions to be more performant than the insertion conterparts: The container is unlikely to reject the new value as a duplicate the reason being that, given the arguments to the constructor of the oject whose ..
I want to exec the sql with dynamci params I can find the codes like the following in pqxx4 work txn(*conn); pqxx::result r = txn.prepared("insert into t (a,b,c,d,e) values (1,2,$1,$2,$3)")(person_name)(age)(sex).exec(); txn.commit(); but I use the pqxx of version 7, the code can’t support. so How to exec the sql with dynamic params in pqxx7? Source: ..
I am trying to implement template multimap Binary Tree container in C++. The elements in this container are Node class pointers, which have pointer to the right element (if the key value is more than previous element’s key), to the left element (if the key value is less than previous element’s key) and extra (if ..
After searching old posts, I still haven’t found how to solve the problem I have with std::move I have a list & a map of <string, list from the same type>. I fill the list in data and then I want to insert the data to the map, but the list in the map stays ..
I have a function: void DBMAP::addM(Volkov_1* b) { setMAP.insert(pair<int, Volkov_1*>(*b->x, b)); } This function passes data from set to multimap. And she copes with her duty, but there is a moment of double ownership. It is necessary not to pass the existing pointer, but to copy. I don’t understand how to implement this. I ask ..
I have an array that inserts a value and shifts elements. Although it compiles, I have some warnings. Here is my code: #include <iostream> void display_array(int arr[], int max_length = 10); void insert_array(int arr[], int insert_num, int index_num, int max_length = 10); int main() { int arr_length = 10; int new_score, index; int test_scores[arr_length] = ..
So I built a BST based off of the example in class. My peers’ trees all work fine, however, I am getting a segmentation fault when I add a second element. I have isolated the error coming from this line – ‘if(current->left == NULL){‘ I am not sure why it is resulting in a segmentation ..
Hello I am not able to print my bst tree with error :Thread 1: EXC_BAD_ACCESS (code=2, address=0x7ffeef3ffff8) on each line of my display function. I thought it was because my left node was null in my tests so I put a comment on that line but it is still not working. Can you please help. ..
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