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Perhaps this lack of attention to minimizing capacity isn’t surprising.In most modern code, our concern is usually time performance rather than space requirements.request to reduce memory use.” Why is deque’s description different than vector and string?Because deque doesn’t have a capacity() member function.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. Of course, the iterators pointing to the removed elements gets invalidated, but all other iterators to the container remain valid. Note that for associative containers we don’t talk about “equal to a certain key” but rather “equivalent to a certain key”.If you’re not familiar with it, this subtle difference is explained in details in Custom comparison, equality and equivalence with the STL.
Before shrink_to_fit() there was no member to reduce capacity on these containers, not even erase().
For this you need to remove the elements satisfying the predicate of having their value equal to something.
Which leads us to the next section: To remove elements from an sequence container according to a predicate, we used . Indeed, pulling up the elements to be kept was OK in a sequence container, where the values are simply lined up one after the other (by definition of a sequence container).
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?" data-medium-file="https://i1com/slashslash.info/wp-content/uploads/2013/10/Scott_Meyers.jpeg? fit=195,259" data-large-file="https://i1com/slashslash.info/wp-content/uploads/2013/10/Scott_Meyers.jpeg? fit=195,259" class="size-full wp-image-33" alt="Scott Meyers" src="https://i2com/ resize=195,259" width="195" height="259" data-recalc-dims="1" / where “c” is a container whose capacity we want to reduce and Container is it’s type.