deleting from a Boost MultiIndex
-
21-06-2021 - |
题
I have a boost multi-index structure that keeps boost::shared_ptr to instances of a class A.
When I use the "find" function of one of the index, I get an iterator "it" from which I can get back the actual pointer through A* a = it->get();
. How can I delete a
from the multi-index knowing that the erase
function of the multi-index structure takes an iterator, not a pointer nor a boost::shared_ptr? The thing is at the point of the program where I want to erase the object, I don't have anymore my initial iterator, only the actual pointer.
Thanks
解决方案
There is no such thing "erase
function of the multi-index structure". Note that erase
is a member-function of an index, and its signature may vary depending on the index type.
In particular, ordered and hashed indices have the following overloads of erase
:
iterator erase(iterator position);
size_type erase(const key_type& x);
iterator erase(iterator first,iterator last);
I.e. if shared_ptr
is a key, you definitely can pass it to erase
function.
Of course, you can call find
first, get the iterator and pass it to erase
.