[RESOLVED] Is it safe to modify an argument from in a slot function?
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I have a signal that emits a std::vector<uint8_t> which contains a load of data (a buffer).
Then in the receiving objects I have a slot that takes an argument std::vector<uint8_t> data
Then I try to decode this data. One of the things I have to do is remove padding, for example:
@
void receive_slot(std::vector<uint8_t> data)
{
// Remove padding
if (data.size() > 20)
data.resize(data.size() - 20);
}
@Now, I thought that this argument passed in is a copy that I can "do what I want with". However, doing a re-size of larger then ~10 bytes crashes my program. I assume that re-sizing less then ~10 bytes does not crash it only by luck.
I therefore assume that I can't safely do this and should first copy it to a new data buffer.
Can anyone enlighten me regarding this?
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Hi,
[quote]Now, I thought that this argument passed in is a copy that I can “do what I want with”[/quote]That is correct. You defined your slot to take parameters by-value after all -- the only way to do that is by copying.
Your crash is caused by something else. As a first step, run your program in a debugger and see its stack trace.
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Thanks for that, this resolves my question! :)
Found the bug a few lines later :o
