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The containers are defined in headers named after the names of the containers, e.g., unordered_set is defined in header <unordered_set>.All containers satisfy the requirements of the Container concept, which means they have begin(), end(), size(), max_size(), empty(), and swap() methods.
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<unordered_map> Added in C++11 and TR1. Provides the container class template std::unordered_map and std::unordered_multimap, hash tables. <unordered_set> Added in C++11 and TR1. Provides the container class template std::unordered_set and std::unordered_multiset. <vector> Provides the container class template std::vector, a dynamic array.
In computer science, a set is an abstract data type that can store unique values, without any particular order. It is a computer implementation of the mathematical concept of a finite set. Unlike most other collection types, rather than retrieving a specific element from a set, one typically tests a value for membership in a set.
A set with precisely two elements is also called a 2-set or (rarely) a binary set. An unordered pair is a finite set; its cardinality (number of elements) is 2 or (if the two elements are not distinct) 1. In axiomatic set theory, the existence of unordered pairs is required by an axiom, the axiom of pairing.
The fundamental concept of musical set theory is the (musical) set, which is an unordered collection of pitch classes. [4] More exactly, a pitch-class set is a numerical representation consisting of distinct integers (i.e., without duplicates). [5]
In set and multiset each element is key; there are no mapped values. Element ordering : elements follow a strict weak ordering [ 1 ] Associative containers are designed to be especially efficient in accessing its elements by their key, as opposed to sequence containers which are more efficient in accessing elements by their position. [ 1 ]
unordered pair A set of two elements where the order of the elements does not matter, distinguishing it from an ordered pair where the sequence of elements is significant. The axiom of pairing asserts that for any two objects, the unordered pair containing those objects exists. upper bound