Question

I want to write contents of an array into a vector.

int A[]={10,20,30,40,50,60,70,80,90};
vector<int> my_vector;

Earlier I used to copy the contents of array A into another array B using memcpy. I want to use my_vector instead of array B

How to write contents of array A into my_vector in one shot without a for loop?

Answer 1

You can use memcpy, or use such initialization in C++98/03.

int A[]={10,20,30,40,50,60,70,80,90};
vector<int> my_vector(A, A + sizeof(A) / sizeof(*A));

Also you can use algorithm, such as copy.

std::copy(A, A + sizeof(A) / sizeof(*A), std::back_inserter(my_vector));

In C++11, use std::begin(A), std::end(A) for begin and end of array.