Segmentation fault when storing the individual detector stations not as unique_ptr

[dtreffenstaedt]

A segmentation fault happens upon creating the current log data when the map which stores the detector stations holds the objects directly, instead of using a std::unique_ptr.

To reproduce, use the commit 66d1a16

Backtrace:

  std::accumulate<double const*, double> (__first=0x7fffdf7ff000, __last=<optimized out>, __init=-nan(0xfffffffffff92))
      at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_numeric.h:141
  141             __init = _GLIBCXX_MOVE_IF_20(__init) + *__first;
  (gdb) backtrace
  #0  std::accumulate<double const*, double> (__first=0x7fffdf7ff000, __last=<optimized out>,
      __init=-nan(0xfffffffffff92))
      at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_numeric.h:141
  #1  muonpi::data_series<double, 100ul, false>::private_mean (this=<optimized out>)
      at include/analysis/dataseries.h:70
  #2  muonpi::data_series<double, 100ul, false>::{lambda()#1}::operator()() const (this=0x7fffc800b3b0)
      at include/analysis/dataseries.h:105
  #3  std::__invoke_impl<double, muonpi::data_series<double, 100ul, false>::{lambda()#1}&>(std::__invoke_other, muonpi::data_series<double, 100ul, false>::{lambda()#1}&) (__f=...)
      at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/invoke.h:60
  #4  std::__invoke_r<double, muonpi::data_series<double, 100ul, false>::{lambda()#1}&>(muonpi::data_series<double, 100ul, false>::{lambda()#1}&) (__fn=...)
      at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/invoke.h:113
  #5  std::_Function_handler<double (), muonpi::data_series<double, 100ul, false>::{lambda()#1}>::_M_invoke(std::_Any_data const&) (__functor=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/std_function.h:291
  #6  0x0000000000503621 in std::function<double ()>::operator()() const (this=0x7fffc800b3b0)
      at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/std_function.h:622
  #7  muonpi::cached_value<double>::get (this=0x7fffc800b3b0)
      at include/analysis/cachedvalue.h:43
  #8  muonpi::data_series<double, 100ul, false>::mean (this=0x7fffc800b080)
      at include/analysis/dataseries.h:136
  #9  muonpi::detector_station::current_log_data (this=0x7fffc800a5c8)
      at src/analysis/detectorstation.cpp:191
  #10 0x000000000050dc0c in muonpi::supervision::station::process (this=<optimized out>)
      at src/supervision/station.cpp:95
  #11 0x0000000000436638 in muonpi::sink::threaded<muonpi::detector_info_t<muonpi::location_t> >::step (
      this=0x7fffffffd068) at include/sink/base.h:156
  #12 0x00000000004887ea in muonpi::thread_runner::run (this=this@entry=0x7fffffffd070)
      at src/utility/threadrunner.cpp:114
  #13 0x000000000048924f in muonpi::thread_runner::exec (this=0x7fffffffd070)
      at src/utility/threadrunner.cpp:139
  #14 0x00007ffff7588ed0 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
  #15 0x00007ffff7a90ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
  #16 0x00007ffff7294def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95