C ontainer is an object, which holds data of same type.
While, there are multiple kinds of containers present. Some of them are general purpose, while others adapt some other containers to match an ADT. Following are the example of a few STL containers:. Similarly, each container defines its own set of functions separately. Iterators allows you to traverse through the elements of a container in almost the same way you use a pointer to traverse through the elements of an array.
They have the ability to initialize, sort, search, and transform the contents of the containers. It is important to note that the algorithms never change the size of a container. Moreover, some of the algorithms depends on external functions. These objects, or the classes of such objects, are usually used to modify the behavior of a container or as arguments to STL algos. You might have used a function object to alter the hashing function of a hash table based container.
Lists are sequence containers. List allows constant time insert as well as delete operations at any point within the sequence.
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Moreover, it allows iteration in both directions. While these lists are able to store every element contained in diverse and distinct storage locations. The elements of the list can be dispersed in multiple chunks of memory. Whereas, the container stores essential information to let the sequential access to the data it contains.
Lists can expand as well as shrink dynamically as needed from both ends.
Furthermore, the storage requirement is automatically fulfilled by the internal allocator. The order as well is maintained internally where each element of a link is connected to the element preceding it and to the element following it.
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Let me summarize some points about the list container before proceeding toward the example and member functions of the list. An STL list container:. Elements present in the list are ordered in a strict linear sequence. Hence, each element is accessed by their respective location in the given sequence. In doubly-linked list, each and every element contains the information on how to trace the previous as well as the next elements. It also allows constant time erase and insert functions prior or after a single or range of specific elements, but it does not allow direct random access.
The stack functions in C++ STL
An Allocator-aware container employs an allocator object to dynamically cater its storage requirements. It is a type of allocator object, which is used to describe the storage allocation model. Normally, the allocator class template is used that describes the most simple memory allocation model as well as it is value-independent. For Example. For example.
C data structures library
You can do it as follows:. There is one exception: an erasure which deletes the last element of a std::deque does invalidate the past-the-end iterator, even though it is not an erased element of the container or an element at all.
Combined with the general rules for std::deque iterators, the net result is that the only modifying operation which does not invalidate std::deque::end is an erasure which deletes the first element, but not the last. Create account Log in. Namespaces Page Discussion. Views View Edit History. From cppreference. Containers library array.
C++ STL Tutorial
Freestanding and hosted implementations. Language support library. Technical Specifications. Contents 1 Sequence containers 2 Associative containers 3 Unordered associative containers 4 Container adaptors 5 span 6 Iterator invalidation 7 Thread safety 8 Member function table. Yes, except erased element s. Thread safety All container functions can be called concurrently by different threads on different containers. All const member functions can be called concurrently by different threads on the same container.