Run twice a macro with vectors of defined size

Newbie
1

Hello,
I have a problem executing the macro attached, using vectors of defined size:

#include <vector>

int test(){
  vector <int> myvec(70);
  cout <<"test" <<endl;
  return 0;
}

It runs ones correctly with .x test.C, but re-running it without exiting ROOT, it gives the following message:

IncrementalExecutor::executeFunction: symbol '_ZSt27__uninitialized_default_n_aIPimiET_S1_T0_RSaIT1_E' unresolved while linking [cling interface function]!
You are probably missing the definition of int* std::__uninitialized_default_n_a<int*, unsigned long, int>(int*, unsigned long, std::allocator<int>&)
Maybe you need to load the corresponding shared library?

How could I solve the problem? Thanks for any input.

2

Hi,
please see the discussion at

Macro reloading’s support is flaky (but better in 6.22 than previous versions).
The problem stems from the fact that C++ is not okay with duplicated symbols.

Cheers,
Enrico

3

Thanks Enrico, I thought the problem was related to the vectors of defined size, because declaring vectors without size and filling them, the macro was simply working.

4

I think it’s just that using a different constructor makes the ROOT interpreter generate different code, and some code is ok with reloading, some code is not. In general, reloading macros is not well-supported.

Common workarounds are loading the macro once with .L and executing the function test() multiple times, or running the macro from the terminal with root -l -b -q test.C, which starts a new interpreter every time.

Cheers,
Enrico

5

OK, thanks for the suggestion.

Cheers,
Francesca

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