I have an array something like this
int A[] = {1, 2, 3, 4, 5, 6, 7}
vector<int> vec;
int index = 0;
for(int i = 0; i < A.size(); i++) {
if(some condition) {
index = i;
}
**vec(A + index, i);**
}
how to convert an array to vector starting from particular index, like above ?
You can use the index as follows.
#include <iterator>
int A[] = {1, 2, 3, 4, 5, 6, 7};
int index = 0;
for(int i = 0; i < A.size(); i++) {
if( /* some condition */ ) {
index = i;
break;
}
}
std::vector<int> vec ( std::begin(A) + index, std::end(A) ) ;
#include the header for std::begin.
std::vector<int> vec(A + index, A + sizeof(A) / sizeof(A[0])); is the way the cool cats do it.
As I have seen in the internet you can add elements to the vectors using insert method, you can get all the elements of your array and adding them to the vector with the for loop just like the following code:
int A[] = {1, 2, 3, 4, 5, 6, 7}
vector<int> vec;
int index = 0;
for(int i = 0; i < A.size(); i++) {
if(some condition) {
vec.insert(vec.begin()+index,A[i]));
index++;
}
**vec(A + index, i);**
}
See this post for more information
insert is for inserting an element at a certain position. when starting with an empty vector using push_back makes more sense
A.size()? Missing semi-colon on the first line, wrong no. of brackets at vec.insert() <- which should as pointed out should really just be emplace_back() or push_back() or at the very least construct the vector with a size , and what is **vec(A + index, i);**?
vec.push_back()and fill up vector that way? If you want to copy entire array int vector:for(int i = 0; i < 7; i++)vec.push_back(A[i]);