How to convert a std::array to a std::vector?

Question

I need to convert a std::array to a std::vector, but I could not find anyway to do it quickly. Here is the sample code:

 std::array<char,10> myData={0,1,2,3,4,5,6,7,8,9};

Now I need to create a vector such as:

std::vector<char> myvector;

and initialize it with the array values.

What is the fastest way to do this?

Good question, really, but why is the array typeof char and the initializer list uses numbers? — R Yoda
– R Yoda, Commented Dec 2, 2018 at 16:48
@RYoda I want to array of data which can behold inside a char, so no reason to define the array of int which consumes more memory. — mans
– mans, Commented Dec 4, 2018 at 16:54

songyuanyao · Accepted Answer · 2017-12-11 14:08:01Z

32

You can use the constructor of std::vector taking iterators.

Constructs the container with the contents of the range [first, last).

e.g.

std::array<char,10> myData = {0,1,2,3,4,5,6,7,8,9};
std::vector<char> myvector(myData.begin(), myData.end());

answered Dec 11, 2017 at 14:08

songyuanyao

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Pete Becker · Accepted Answer · 2017-12-11 14:11:47Z

7

Just for variety:

std::vector<char> myvector(std::begin(myData), std::end(myData);

answered Dec 11, 2017 at 14:11

Pete Becker

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UKMonkey · Accepted Answer · 2017-12-11 14:08:04Z

3

I'd use the range constructor of vector - looking like myvector(myData.begin(), myData.end())

for future reference: http://en.cppreference.com/w/cpp/container/vector/vector

answered Dec 11, 2017 at 14:08

UKMonkey

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Caleth · Accepted Answer · 2017-12-11 14:08:12Z

3

std::vector<char> myvector { myData.begin(), myData.end() };

answered Dec 11, 2017 at 14:08

Caleth

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