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Stl invalidating iterators

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Inserting at the beginning or end may allocate a new block, but it never moves around previous elements, so pointers remain valid.STL containers have the problem that iterators can be invalidated when the container changes.Internal iterators are higher order functions (often taking anonymous functions) such as map, reduce etc., implementing the traversal across a container, applying the given function to every element in turn.

One thing that worries me, coming most recently from garbage-collected languages, is ensuring that random objects don't just go disappearing on users if they make a mistake regarding lifetimes.

The primary purpose of an iterator is to allow a user to process every element of a container while isolating the user from the internal structure of the container.

Details: I've recently been brushing up on my C and learning my way around C 11.

Though the interface and semantics of a given iterator are fixed, iterators are often implemented in terms of the structures underlying a container implementation and are often tightly coupled to the container to enable the operational semantics of the iterator.

Note that an iterator performs traversal and also gives access to data elements in a container, but does not perform iteration (i.e., not without some significant liberty taken with that concept or with trivial use of the terminology).

To account for this, both the certainly seems to let iterators get invalidated and still (incorrectly) function.

What I want to know is: what is expected from "good"/idiomatic C 11 code?

@Muhammad Annaqeeb: This answer admittedly doesn't make it clear, as I took a shortcut, but the intention is to say that resizing is insertion/erasure, as in if a reallocation is required, you may consider that to be the same as erasing then re-inserting all affected elements.

That section of the answer could certainly be [email protected]: deque stores data in non-contiguous blocks.

As part of that, I've been writing an idiomatic wrapper around the uriparser library.

Part of this is wrapping the linked list representation of parsed path components.