I am trying to modify members of all elements matching value for a given index in a boost.multiindex container

index.modify(

  index.find(value),

  [](T& element) { ... }

)

seems to update a singular element(first match)

On the other hand,

std::pair<index::iterator, index::iterator> iter = index.equal_range(value);

while(iter.first != iter.second) {

  iter.first++;

}

leads to segfaults and unexpected behavior.

What would be right way to approach this?