[Samuel Twain]

Dear all:
It seems that labelUList can be constructed by constructor labelUList(val,size) which can be seen as following:

template<class T>
 inline Foam::UList<T>::UList(T* __restrict__ v, label size)
 :
     size_(size),
     v_(v)
 {}

So I constructed a labelUList class:

 labelUlist marks(0,50);

The operator[] for labelUList has been reloaded. But I failed to Info or change the element of marks by :

Info << marks[3] <<endl;
marks[4]=5;

And the erro is:

#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::sigSegv::sigHandler(int) at ??:?
#2  ? in /lib/x86_64-linux-gnu/libc.so.6
#3  ? in ~/OpenFOAM/saumuel-v1806/platforms/linux64GccDPInt64Opt/bin/IBIcoFoamFD
#4  __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
#5  ? in ~/OpenFOAM/saumuel-v1806/platforms/linux64GccDPInt64Opt/bin/IBIcoFoamFD
Segmentation fault (core dumped)

Could anyone please give me some advices?
Thank you
samuel