is the action of adding an element at the end of a container.
push-back is the action of adding an element at the end of a container.
Questions tagged [push-back]
420 questions
-2
votes
2 answers
speeding vector push_back
I am trying to speed vector::push_back when capacity cant be predicted
When reserve is available a vector push_back writes the new element at the end of the container, and then the end marker is moved. After all reserve is used, push_back may…
Saint-Martin
- 306
- 3
- 16
-2
votes
1 answer
C++ how to push_back() members of vector struct
I got this struct:
struct human{
int ma;
double su;
string nev;
};
And this part in main() :
vector t;
fstream inf("in.txt");
I want read in the information from file by using this :
while(!inf.eof())
{
…
EmpiresKnight
- 1
- 1
-2
votes
2 answers
Dynamically resizing and filling a vector of vectors in C++
I have a vector that will have an unknown number of rows and 3 columns. The vector should be constructed as follows: a statistical test is made, if it pass a threshold the vector should store infos about it.
What I am doing is:
vector< vector < int…
Ninja Warrior
- 47
- 8
-2
votes
1 answer
Funny behavior when pushing onto list in c++
I give up, I simply want to know why push_back is not working as intended. Forget how bad or over complicated my code is.
I have a python program which reads a buffer, and displays it line by line from a list. If the last line is not complete,…
-2
votes
1 answer
Push_back function for Class defined vector
I have a vector that takes in class values of a class called Bug which stores a mass and number of legs for each instance. I'm having trouble using the push_back function, and suspect it's just a syntax issue, but can't figure out exactly what I'm…
Cayden
- 29
- 5
-2
votes
1 answer
Vector push_back error when compiling
Compiling this segment of code involving using the push_back function for vectors ends up in an error.
for (int i=0; i<=n; i++)
{
if(i==0)
{
Profit[i].push_back(0);
Weight[i].push_back(0);
Name[i].push_back("");
…
Megumi Ai
- 89
- 2
- 9
-2
votes
2 answers
How to use push_back with double* pointer
I have the following function in c++
void LocatePulseEdges(int points, double* signal_x, double* signal_y, double* derivative, double threshold, double* left_edge, double* right_edge){
for (int i=0; i
Thanos
- 594
- 2
- 7
- 28
-2
votes
2 answers
std::vector push_back results in access Violation
Story: I'm making a shared library exposing C code as a wrapper to a C++ static library compiled in VS 2008, so I'm tied to that compiler. In my library I'm trying to do a very simple dictionary to pass data through the shared library boundaries.…
jabozzo
- 591
- 1
- 6
- 17
-2
votes
1 answer
I cant modify any private fields through public methods from class Artist. I tried adding reference( &) before function names but crashes
addAlbum should add Albums to a certain artist but push_back() doesnt work.
as you can see in the picture i cannot modify any private field from Artist class through public methods
https://i.stack.imgur.com/Imwf2.png
Is this because i didnt write a…
Marian Iconaru
- 199
- 4
- 12
-2
votes
2 answers
How to push an array into a hash in ruby
I didn't find in the internet something that answers specifically my question.
I have a hash as follows:
hash = {[1111, 4, 20]}
And i want to push another array ([3333, 2, 70]) to that hash to get something like:
hash = {[1111, 4, 20], [3333, 2,…
Rails Rails
- 143
- 1
- 13
-2
votes
3 answers
Why push_back doesn't push a copy of the source obj?
My code is just like below:
class CDemo {
public:
CDemo()
: str(NULL){
};
~CDemo() {
if (str)
delete[] str;
};
char* str;
};
void testVector() {
CDemo c;
c.str = new char[32];
…
wuchang
- 3,003
- 8
- 42
- 66
-2
votes
1 answer
C++ postfix incrementation during list push_back
I have a code flush[*it % 4].push_back(*(it++) /= 4); and it was meant to push_back the new value(old value/4) before incrementing the it iterator, is it right like this or how to do it the fastest way to get value from iterator, divide it by 4,…
Lukas Salich
- 959
- 2
- 12
- 30
-3
votes
1 answer
C++ vector push_back function
So I am pretty new to coding and am having some issues with storing user input into a vector using the push_back function. can some one tell me what I am doing wrong?
vector user_nums;
switch(selection){
case 'P':
case…
Patrick Gillen
- 11
- 2
-3
votes
1 answer
Storing variables in a vector using push_back
I'm trying to store partial sums in a vector, using push_back and a for loop, however push_back causes an infinite loop for some reason.
cin >> n;
vector partialSums(n);
for (i = 1; i <= partialSums.size(); ++i) {
sum = sum + i;
…
Michel
- 3
- 3
-3
votes
1 answer
vector.push_back doesn't work! [Runtime error]
I've scoured the internet for a solution, but have yet to find one.
It seems like push_back doesn't work in this particular code.
AddConnection gets called, always and for sure, but whenever I use
node.connections.size()
it returns 0, which, as…
Jacob
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