I have an array created like this:
std::vector<int> data(n);
I have another array b (c Array b[]) having n int values. I want to put these values into data:
for (int i =0 ; i<n, i++) {
data[i] = b[i];
}
Is there any other method in C++ for copying an array into another arrays ?
It's not entirely clear from your question, but if b and data are both std::vector<int>, then you can do five related things:
Initializing a new data with b
std::vector<int> data = b; // copy constructor
Initializing a new data with b
std::vector<int> data(begin(b), begin(b) + n); // range constructor
Copying b entirely into an existing data (overwriting the current data values)
data = b; // assignment
Copying the first n elements of b into an existing data (overwriting the current data values)
data.assign(begin(b), begin(b) + n); // range assignment
Appending the first n elements of b onto an existing data
data.insert(end(a), begin(b), begin(b) + n); // range insertion
You can also use end(b) instead of begin(b) + n if b has exactly n elements. If b is a C-style array, you can do a using std::begin; and using std::end, and the range construction/assignment/insertion will continue to work.
If b is an int[] (that is, a C array) then you can do:
std::vector<int> data(b + 0, b + n);
If b is also a std::vector then you can just do:
std::vector<int> data = b;
You could use copy (but be sure that you have enough elements in the destination vector!)
copy(begin(b), end(b), begin(data))
std::copydoes the same without a hand-made loop.datafor anything else once you've made the copy?data = b.