adding multiple elements to c++ vector at once

Question

I was wondering if it is possible to push_back multiple elements to c++ vector more easily

For example

I create 5 objects

A a1;
A a2;
A a3;
A a4;
A a5;

Currently, i push all of them back like this

vector<A> list;
list.push_back(a1);
list.push_back(a2);
list.push_back(a3);
list.push_back(a4);
list.push_back(a5);

I was wondering if this can be done more succinctly like vector list(a1, a2, a3, a4, a5)..etc Thanks!

this has already been answered here: http://stackoverflow.com/questions/14561941/passing-multiple-int-values-into-a-vector — Florian Groetzner, Nov 08 '13 at 17:53

Chad · Accepted Answer · 2013-11-08T17:53:24.240

6

In C++11 you can use vector's initializer-list constructor:

vector<A> list {a1, a2, a3, a4, a5};

If C++11 isn't available you can use the iterator based constructor if you create a temporary array, but it's not as clean as the C++11 solution:

A tmp_list[] = {a1, a2, a3, a4, a5};
vector<A> list(tmp_list, tmp_list + 5};

edited Nov 08 '13 at 17:53

answered Nov 08 '13 at 17:47

Chad

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Also, there's `std::begin()` and `std::end()`. – Nov 08 '13 at 17:51
Yes, but I meant to illustrate that the second version was pre-`C++11`, I'll edit to be more clear. – Chad Nov 08 '13 at 17:52
I have the feeling that this could be done more efficiently (less copies) by using a `std::ref` clone, but I don't have the drive to test it ;) – David Rodríguez - dribeas Nov 08 '13 at 18:16

adding multiple elements to c++ vector at once

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