Stl invalidating iterators

So we can’t just shuffle the elements like To make sure that this function is only used with associative containers, I suppose we will be able to use a concept when they’re out (in C 20, as it seems) but in the meantime we can just write the various cases explicitly: This type of generic function has been proposed by Stephan T. Next up in our series about removing stuff from containers in C we’ll see how to remove duplicates from associative containers.It’s a hairy topic, but one that gives a chance to get a more in-depth understanding of STL containers. This works because most implementations will implement the iterator range constructor to not make the capacity any larger than necessary.The reserve() guarantee is swapped to the other container with the call to swap().No because we can always expand the string to the “short” string limit without invalidating iterators (assuming the current size() is less than this limit).This means that if we currently have a string whose size() is less than the “short” string limit, a “request to reduce capacity() to size()” is going to fail.Perhaps this lack of attention to minimizing capacity isn’t surprising.

If you’re not familiar with it, this subtle difference is explained in details in Custom comparison, equality and equivalence with the STL.But C is the language of choice for demanding situations and sometimes this means minimizing space requirements.Scott Meyers is the author of the Effective C series of books.So an library might choose to implement the string class so that the class itself has (data member) space for “short” strings so that no allocation is necessary until the size of the string is no longer “short” for some value of “short.” Given this implementation how would capacity() be implemented?In particular would capacity() ever return a value less than the “short” string limit?

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