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  • Praveen Gupta thinks this is interesting:

A data structure, such as a list or a vector, is not very useful on its own. To use one, we need operations for basic access such as adding and removing elements (as is provided for list:vector element on a list and vector). Furthermore, we rarely just store objects in a container. We sort them, print them, extract subsets, remove elements, search for objects, etc. Consequently, the standard library provides the most common algorithms for containers in addition to providing the most common container types. For example, the we can simply and efficiently sort a vector of a vector, is not very useful on i...

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