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How to set up vector of vector pairs?
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In this code, I am trying to make a vector of vector pairs. The code compiles but it has a segmentation fault and I cannot figure out where I am going wrong. I would be grateful for any hint that can solve my problem.
#include <iostream>
#include <vector>
using namespace std;
vector<vector<pair<int,bool> > > pairs;
void insert(int x, int y)
pair<int,bool> tuple=make_pair(y,0);
pairs[x].push_back(tuple);
void pairing()
for(int i=0; i<12; i++)
for(int j=0; j<12; j++)
insert(i,j);
int main()
pairing();
return 0;
c++ vector std-pair push-back
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
asked Sep 8 '18 at 0:10
user143user143
143
add a comment |
In this code, I am trying to make a vector of vector pairs. The code compiles but it has a segmentation fault and I cannot figure out where I am going wrong. I would be grateful for any hint that can solve my problem.
#include <iostream>
#include <vector>
using namespace std;
vector<vector<pair<int,bool> > > pairs;
void insert(int x, int y)
pair<int,bool> tuple=make_pair(y,0);
pairs[x].push_back(tuple);
void pairing()
for(int i=0; i<12; i++)
for(int j=0; j<12; j++)
insert(i,j);
int main()
pairing();
return 0;
c++ vector std-pair push-back
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
asked Sep 8 '18 at 0:10
user143user143
143
std::vector<std::vector<std::pair<int,bool>>> pairs(12, 0, false, 1, false, .., 10, false, 11, false);(you probably want to create function to create inner vector).
– Jarod42
Sep 8 '18 at 0:24
The vectorpairsis created with size zero, and nothing in your code changes that. Evaluatingpairs[x]therefore gives undefined behaviour for any value ofx, as does doing any operation on it (i.e.pairs[x].push_back(tuple)). You need to resizepairsso it has enough elements before trying to manipluate the vectors it contains.
– Peter
Sep 8 '18 at 0:24
add a comment |
In this code, I am trying to make a vector of vector pairs. The code compiles but it has a segmentation fault and I cannot figure out where I am going wrong. I would be grateful for any hint that can solve my problem.
#include <iostream>
#include <vector>
using namespace std;
vector<vector<pair<int,bool> > > pairs;
void insert(int x, int y)
pair<int,bool> tuple=make_pair(y,0);
pairs[x].push_back(tuple);
void pairing()
for(int i=0; i<12; i++)
for(int j=0; j<12; j++)
insert(i,j);
int main()
pairing();
return 0;
c++ vector std-pair push-back
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
asked Sep 8 '18 at 0:10
user143user143
143
In this code, I am trying to make a vector of vector pairs. The code compiles but it has a segmentation fault and I cannot figure out where I am going wrong. I would be grateful for any hint that can solve my problem.
#include <iostream>
#include <vector>
using namespace std;
vector<vector<pair<int,bool> > > pairs;
void insert(int x, int y)
pair<int,bool> tuple=make_pair(y,0);
pairs[x].push_back(tuple);
void pairing()
for(int i=0; i<12; i++)
for(int j=0; j<12; j++)
insert(i,j);
int main()
pairing();
return 0;
c++ vector std-pair push-back
c++ vector std-pair push-back
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
asked Sep 8 '18 at 0:10
user143user143
143
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
asked Sep 8 '18 at 0:10
user143user143
143
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
edited Mar 6 at 22:44
Brian Tompsett - 汤莱恩
4,2421339102
4,2421339102
asked Sep 8 '18 at 0:10
user143user143
143
asked Sep 8 '18 at 0:10
user143user143
143
asked Sep 8 '18 at 0:10
user143user143
143
143
std::vector<std::vector<std::pair<int,bool>>> pairs(12, 0, false, 1, false, .., 10, false, 11, false);(you probably want to create function to create inner vector).
– Jarod42
Sep 8 '18 at 0:24
The vectorpairsis created with size zero, and nothing in your code changes that. Evaluatingpairs[x]therefore gives undefined behaviour for any value ofx, as does doing any operation on it (i.e.pairs[x].push_back(tuple)). You need to resizepairsso it has enough elements before trying to manipluate the vectors it contains.
– Peter
Sep 8 '18 at 0:24
add a comment |
std::vector<std::vector<std::pair<int,bool>>> pairs(12, 0, false, 1, false, .., 10, false, 11, false);(you probably want to create function to create inner vector).
– Jarod42
Sep 8 '18 at 0:24
The vectorpairsis created with size zero, and nothing in your code changes that. Evaluatingpairs[x]therefore gives undefined behaviour for any value ofx, as does doing any operation on it (i.e.pairs[x].push_back(tuple)). You need to resizepairsso it has enough elements before trying to manipluate the vectors it contains.
– Peter
Sep 8 '18 at 0:24
std::vector<std::vector<std::pair<int,bool>>> pairs(12, 0, false, 1, false, .., 10, false, 11, false); (you probably want to create function to create inner vector).– Jarod42
Sep 8 '18 at 0:24
std::vector<std::vector<std::pair<int,bool>>> pairs(12, 0, false, 1, false, .., 10, false, 11, false); (you probably want to create function to create inner vector).– Jarod42
Sep 8 '18 at 0:24
The vector
pairs is created with size zero, and nothing in your code changes that. Evaluating pairs[x] therefore gives undefined behaviour for any value of x, as does doing any operation on it (i.e. pairs[x].push_back(tuple)). You need to resize pairs so it has enough elements before trying to manipluate the vectors it contains.– Peter
Sep 8 '18 at 0:24
The vector
pairs is created with size zero, and nothing in your code changes that. Evaluating pairs[x] therefore gives undefined behaviour for any value of x, as does doing any operation on it (i.e. pairs[x].push_back(tuple)). You need to resize pairs so it has enough elements before trying to manipluate the vectors it contains.– Peter
Sep 8 '18 at 0:24
add a comment |
2 Answers
2
active
oldest
votes
pairs has no elements so you can't do this: pairs[x].
Either resize the pairs vector so it has N blank vector<pair<int,bool> > in it, or create a vector<pair<int,bool> > first and push it back into pairs
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
add a comment |
Reading the std::vector reference for operator []...
"Unlike std::map::operator[], this operator never inserts a new element into the container."
answered Mar 6 at 23:16
Madison A.Madison A.
86
add a comment |
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2 Answers
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pairs has no elements so you can't do this: pairs[x].
Either resize the pairs vector so it has N blank vector<pair<int,bool> > in it, or create a vector<pair<int,bool> > first and push it back into pairs
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
add a comment |
pairs has no elements so you can't do this: pairs[x].
Either resize the pairs vector so it has N blank vector<pair<int,bool> > in it, or create a vector<pair<int,bool> > first and push it back into pairs
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
add a comment |
pairs has no elements so you can't do this: pairs[x].
Either resize the pairs vector so it has N blank vector<pair<int,bool> > in it, or create a vector<pair<int,bool> > first and push it back into pairs
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
pairs has no elements so you can't do this: pairs[x].
Either resize the pairs vector so it has N blank vector<pair<int,bool> > in it, or create a vector<pair<int,bool> > first and push it back into pairs
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
answered Sep 8 '18 at 0:17
Anon MailAnon Mail
4,29911218
4,29911218
add a comment |
add a comment |
Reading the std::vector reference for operator []...
"Unlike std::map::operator[], this operator never inserts a new element into the container."
answered Mar 6 at 23:16
Madison A.Madison A.
86
add a comment |
Reading the std::vector reference for operator []...
"Unlike std::map::operator[], this operator never inserts a new element into the container."
answered Mar 6 at 23:16
Madison A.Madison A.
86
add a comment |
Reading the std::vector reference for operator []...
"Unlike std::map::operator[], this operator never inserts a new element into the container."
answered Mar 6 at 23:16
Madison A.Madison A.
86
Reading the std::vector reference for operator []...
"Unlike std::map::operator[], this operator never inserts a new element into the container."
answered Mar 6 at 23:16
Madison A.Madison A.
86
answered Mar 6 at 23:16
Madison A.Madison A.
86
answered Mar 6 at 23:16
Madison A.Madison A.
86
answered Mar 6 at 23:16
Madison A.Madison A.
86
86
add a comment |
add a comment |
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std::vector<std::vector<std::pair<int,bool>>> pairs(12, 0, false, 1, false, .., 10, false, 11, false);(you probably want to create function to create inner vector).– Jarod42
Sep 8 '18 at 0:24
The vector
pairsis created with size zero, and nothing in your code changes that. Evaluatingpairs[x]therefore gives undefined behaviour for any value ofx, as does doing any operation on it (i.e.pairs[x].push_back(tuple)). You need to resizepairsso it has enough elements before trying to manipluate the vectors it contains.– Peter
Sep 8 '18 at 0:24