Boost Array data issue

Question

Hey!

I now try to send packet with boost asio, and i store packet data in boost array. Before i was sending it by dynamic allocated char array.

I declare array by boost::array<char, 5824>

And after it I set normally values in my array.

I send it by boost asio (synchronously). But problem is there when client receive packet, about 1000 first bytes are ok, but other contains random data.

What I doing there wrong ? I tried different combinations, but result is same. Thanks!

edit

I fill up data by memcpy on array pointer obtained by method array.data();
For example memcpy(array.data()+10, &chararray, 15);
Data is sended by boost::asio::write(socket_, boost::asio::buffer(array));

Please show us the code you use to fill and send the array. If possible, please provide a SSCCE — dyp
– dyp, Commented Jan 4, 2014 at 15:10
@Mgetz thank you for help! When i changed it into std::array it started working ;). But it seems it still have random bytes at all. — user3126089
– user3126089, Commented Jan 4, 2014 at 15:28

Mgetz · Accepted Answer · 2014-01-04 16:06:15Z

2

Why not use std::array? Boost recommends it as a replacement given that it's been added to the standard library. Then you can use the fill member to initialize it, or use a {} initalizer to zero it in place.

using socketData = std::array<char, 5824>;
socketData data{}; // uninitialized per standard, the {} zeros

socketData::iterator iter = data.begin();

// write data using iterators
boost::asio::write(socket_, boost::asio::buffer(array));

edited Jan 4, 2014 at 16:06

answered Jan 4, 2014 at 15:48

Mgetz

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3 Comments

juanchopanza Over a year ago

You don't need to fill with zeros. You can say socketData data{};. But your code is not doing the same as OP's. They are copying from a different array.

Mgetz Over a year ago

@juanchopanza I've updated my example for your zeroing recommendation. I'm not seeing their copy but that would be easily achieved using std::copy anyway.

juanchopanza Over a year ago

They memcpy 15 bytes from one array to another, starting at the 10th position of the destination array. Yes, you can do that with std::copy and it would be easier to read :)

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