Thread: Boost.Array vs std::vector

Originally Posted by Elysia

Nevertheless, a true iterator also contains some mandatory typedefs describing its characteristics. And some function rely on those typedefs, which will break them when using raw pointers.

Considering that std::iterator_traits can be used as it is specialised for pointers, the lack of those typedefs do not mean that pointers are not "true" iterators.

Originally Posted by manasij7479

Could this be true when some extra memory is needed for a dynamically allocated array and the re'allocation is not contiguous ?

What do you mean by "a dynamically allocated array"? Note that a std::vector's storage is contiguous.

Originally Posted by laserlight

Considering that std::iterator_traits can be used as it is specialised for pointers, the lack of those typedefs do not mean that pointers are not "true" iterators.

I don't think that is the problem. More like that some functions will try to access T::some_type where T is the iterator type.
*shrug* That's the problem as I know it.

Originally Posted by manasij7479

a normal one... (...) or realloc'ing something earlier allocated with malloc ...

Allocation of memory in those cases will be contiguous.

Originally Posted by Elysia

More like that some functions will try to access T::some_type where T is the iterator type.

Then they should be rewritten to access typename std::iterator_traits<T>::some_type.

And to think I'm two weeks ahead of class and it's OVER in two weeks. All I got to do is the FINAL, so no more "is this HW", Never Again!

Anyway, I was about to start another thread but was afraid to ask "How-To"... than I read you guys new post, than I did a search and I found this link ... raw pointers and std::vector< std::vector< std::string > > ... Seems related and right up my alley anyway ... and they both works perfectly. I can't wait to get into bench-marking.

c++ - How to write the content of different files to a vector for further use with getline - Stack Overflow

This been my interest ever since you help me Ms. Elysia in my old vector thread and was what I needed to find to justify my reason to take a few semesters of C++ in the first place! Since than it been all about vector, It and Maps for me. I learn (pick-up) more from THIS thread than I learn all year. But school was cool.

I hope the OP can make use of this also, but it may not be nothing new to anyone but me.


btw: the forum was noticeable smoother since the new look but got very sluggish since the temporary shut down/clean-up a day or two ago ... I just notice that this only happens when I'm log-in. It's a rocket when I'm not.