Error in <TRint::HandleTermInput()>: std::out_of_range caught: vector::_M_range_check: __n (which is 0) >= this->size() (which is 0)

ROOT
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Hi Experts

I had been using this macro to dump information from root files into a TTree. Suddenly when I increased the number of branches, I get this error:

Error in <TRint::HandleTermInput()>: std::out_of_range caught: vector::_M_range_check: __n (which is 0) >= this->size() (which is 0)

I have never seen this error before and my guess is that I need to allocate memory or increase the size of my vector, but I don’t know how to do that.

I have attached the root macro.
I’d appreciate any help. Please let me know if you need any more info.

Thanks!
demo_ReadEvent.C (10.9 KB)

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In your macro, you unconditionally access pointers without prior checking that they are not null (e.g. in mctrack_vec(*mctrack_handle) you do not check “mctrack_handle”).
You also unconditionally access vector elements without prior checking that its size is big enough (e.g. in a.at(0).X() in you do not check that a.size() > 0).
You can easily “reproduce” your error:

root [0] std::vector<double> v;
root [1] std::cout << v.size() << std::endl;
root [2] std::cout << v.at(0) << std::endl;
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Thank you @Wile_E_Coyote. Indeed for many cases I found that a.size()==0 which causes this error. Now I simply used an IF condition to skip over a.size()==0 events.

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