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
0
votes
1 answer
C++ push_back compiler error "
I am trying to add a struct to a vector of structs.
vector n;
vector_tags;
for (unsigned t=0;t<_tags.size();t++)
{
udtTag &nt=_tags[t];
for (int i=nt.PosStartTag;i
tmighty
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votes
1 answer
C++ Cannot use push_back on list containing custom structs
We are making a list that hold info on boardgames (name, year, score). We scan the info out of a .csv file, make a struct based on that info and then add the struct to a list. We keep doing this untill the document is done reading. Problem is that…
Emvidasch
- 97
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0
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0 answers
Vector of lists fails to copy new element
My goal is to find the shortest paths from each node in a graph to each other node via Dijkstra's algorithm, including equal length paths that are different from each other. To store these paths, each node has a vector for each other node in the…
forley
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- 1
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0 answers
C++ push_back overwrites last vector element
Since I cannot answer my own question in 8 hours after asking, I'm posting my solution here.
Made some mistakes in the incoming channel number and number of the vector element. Setting the value of channel-1 instead of channel fixed to problem.
My…
Hidde de Jong
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- 1
0
votes
1 answer
std::sort() not working on vector of pairs
I have the following code snippet:
struct compare {
bool operator()(const pair& left, const pair& right) {
return left.second > right.second;
}
};
int main() {
size_t vertices = 31112738;
…
user1715122
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0
votes
3 answers
How do you add new objects to a user-defined Class vector?
I'm a C++ beginner (no prior programming experience). I'm writing a text-based game and I have a core module to develop for the "Population" of the game. So far I've established the population growth rates (based on pre-defined natality and…
Optimae
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1 answer
c++ vectors and push_back
I am getting a strange c++ error:
main.cpp:81:9: error: request for member ‘push_back’ in ‘points’, which is of non-class type ‘std::vector >()’
I am reading this like c++ is trying to tell me that the function push_back is not…
CodeKingPlusPlus
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votes
6 answers
Push_back doesn't work
Tried on Visual 2010, Visual 2012 and CodeBlocks without success. I've been roaming the internet for an answer for the past 3 days and have found nothing to help me.
I've tried two ways, first
vector mvec;
int num;
while(cin >>…
user2642503
- 1
- 1
0
votes
1 answer
time complexity of reserve on an empty vector vs. a deque and whether to use emplace or push_back
I am debating which is going to be faster, if I am using a data structure to store call backs within a class should I use a vector and reserve on start up or should I just use a deque in this case since the total number of subscribers is not known…
bjackfly
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votes
2 answers
Generic Vector Push Back Template
I'm writing some code to interact with a database. My solution is to use vectors of various structs to represent each table within the database. I want to create a template inside my Database class to push_back the vector and insert a new (blank)…
Ash
- 3
- 2
0
votes
1 answer
C++: Eclipse code checker error related to vector push_back
The code:
#include
int main()
{
std::vector v1 = {12, 34};
std::vector v2 = {56, 78};
//Doesn't work.
v1.push_back(v2[0]);
//Works.
int i = v2[0];
v1.push_back(i);
return 0;
}
For some reason,…
Maxime Michel
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- 6
0
votes
2 answers
Push_back in vector of objects from aggregate class
I'm having a little issue with vectors. From what I understand, push_back() will copy the argument and insert the copy in the vector.
struct BridgeData
{
string name;
string type;
};
For a simple aggregate class such as mine, the copy of an…
wrousseau
- 311
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- 12
0
votes
0 answers
SIGTRAP on push_back with vector, no breakpoints set
I am trying to generate a spanning tree of a graph by using a randomized version of Prim's algorithm. However, my program crashes during the spanning tree generation phase, and closer examination has revealed three different errors.
1) A SIGTRAP is…
Nelarius
- 181
- 2
- 10
0
votes
1 answer
Simple Calling vector of a class I made "does not name a type"
Quick intro I am having an issue when I define a simple class called 'token', that is comprised of two int values, and I make a vector out of this class. I am unable to use the 'push_back'. the compiler tells me my 'does not name a type'
Code…
Krtko
- 1,055
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0
votes
2 answers
Memory allocation with vector push_back
I learned something interesting today: if I have a standard vector v and I run code like:
std::vector v;
for (int i = 0; i < 2; i++) v.push_back(2.);
if I call v[2] I will not get a segmentation fault, because the operator[] does not do…
webb
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