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| Category: containers | | Component type: concept |
Description
A Unique Hashed Associative Container is a Hashed Associative Container that is also a UniqueAssociativeContainer. That is, it is a HashedAssociativeContainer with the property that no two elements in the container have the same key.
Refinement of
HashedAssociativeContainer, UniqueAssociativeContainer
Associated types
None, except for those described in the HashedAssociativeContainer and UniqueAssociativeContainer requirements.
Notation
X | A type that is a model of Hashed Associative Container |
a | Object of type X |
t | Object of type X::value_type |
k | Object of type X::key_type |
p, q | Object of type X::iterator |
n | Object of type X::size_type |
h | Object of type X::hasher |
c | Object of type X::key_equal |
Definitions
Valid expressions
In addition to the expressions defined in HashedAssociativeContainer and UniqueAssociativeContainer, the following expressions must be valid.
| Name | Expression | Type requirements | Return type |
| Range constructor | | i and j are InputIterator whose value type is convertible to T [1]. | X |
| Range constructor with bucket count | | i and j are InputIterator whose value type is convertible to T [1]. | X |
| Range constructor with hash function | X(i, j, n, h)
X a(i, j, n, h);
| i and j are InputIterator whose value type is convertible to T [1]. | X |
| Range constructor with key equal | X(i, j, n, h, k)
X a(i, j, n, h, k);
| i and j are InputIterator whose value type is convertible to T [1]. | X |
Expression semantics
| Name | Expression | Precondition | Semantics | Postcondition |
| Range constructor | | [i,j) is a valid range. | Creates an associative container that contains all of the elements in the range [i,j) that have unique keys, using hasher() as the hash function and key_equal() as the key equality function. | size() is less than or equal to the distance from i to j. The bucket count is an unspecified default value. The hash function is hasher(), and the key equality function is key_equal(). |
| Range constructor with bucket count | | [i,j) is a valid range. | Creates an associative container that contains all of the elements in the range [i,j) that have unique keys, using at least n buckets, and using hasher() as the hash function and key_equal() as the key equality function. | size() is less than or equal to the distance from i to j. The bucket count is greater than or equal to n. The hash function is hasher(), and the key equality function is key_equal(). |
| Range constructor with hash function | X(i, j, n, h)
X a(i, j, n, h);
| [i,j) is a valid range. | Creates an associative container that contains all of the elements in the range [i,j) that have unique keys, using at least n buckets, and using h as the hash function and key_equal() as the key equality function. | size() is less than or equal to the distance from i to j. The bucket count is greater than or equal to n. The hash function is h, and the key equality function is key_equal(). |
| Range constructor with key equal | X(i, j, n, h, k)
X a(i, j, n, h, k);
| [i,j) is a valid range. | Creates an associative container that contains all of the elements in the range [i,j) that have unique keys, using at least n buckets, and using h as the hash function and k as the key equality function. | size() is less than or equal to the distance from i to j. The bucket count is greater than or equal to n. The hash function is h, and the key equality function is k. |
Complexity guarantees
The range constructor, range constructor with bucket count, range constructor with hash function, and range constructor with key equal, are all linear in j - i.
Invariants
Models
Notes
[1] At present (early 1998), not all compilers support "member templates". If your compiler supports member templates then i and j may be of any type that conforms to the InputIterator requirements. If your compiler does not yet support member templates, however, then i and j must be of type const T* or of type X::const_iterator.
See also
AssociativeContainer, HashedAssociativeContainer, MultipleHashedAssociativeContainer SortedAssociativeContainer
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