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Multiple Sorted Associative Container


Category: containers	Component type: concept

Description

A Multiple Sorted Associative Container is a Sorted Associative Container that is also a Multiple Associative Container. That is, it is a Sorted Associative Container with the property that any number of elements in the container may have equivalent keys.

Refinement of

Sorted Associative Container, Multiple Associative Container

Associated types

None, except for those described in the Sorted Associative Container and Multiple Associative Container requirements.

Notation

`X`	A type that is a model of Multiple Sorted 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`
`c`	Object of type `X::key_compare`

Definitions

Valid expressions

In addition to the expressions defined in Sorted Associative Container and Multiple Associative Container, the following expressions must be valid.

Name	Expression	Type requirements	Return type
Range constructor	X(i, j) X a(i, j);	`i` and `j` are Input Iterators whose value type is convertible to `T` [1].	`X`
Range constructor with compare	X(i, j, c) X a(i, j, c);	`i` and `j` are Input Iterators whose value type is convertible to `T` [1]. `c` is an object of type `key_compare`.	`X`
Insert with hint	`a.insert(p, t)`		`iterator`
Insert range	`a.insert(i, j)`	`i` and `j` are Input Iterators whose value type is convertible to `X::value_type`. [1]	`void`

Expression semantics

Name	Expression	Precondition	Semantics	Postcondition
Range constructor	X(i, j) X a(i, j);	`[i,j)` is a valid range.	Creates an associative container that contains all of the elements in the range `[i,j)`. The comparison object used by the container is `key_compare()`.	`size()` is equal to the distance from `i` to `j`.
Range constructor with compare	X(i, j, c) X a(i, j, c);	`[i,j)` is a valid range.	Creates an associative container that contains all of the elements in the range `[i,j)`. The comparison object used by the container is `c`.	`size()` is equal to the distance from `i` to `j`.
Insert with hint	`a.insert(p, t)`	`p` is a nonsingular iterator in `a`.	Inserts `t` into `a`. The argument `p` is a hint: it points to the location where the search will begin. The return value is a dereferenceable iterator that points to the element that was just inserted.	`a` contains an element whose key is the same as that of `t`. The size of `a` is incremented by `1`.
Insert range	`a.insert(i, j)`	`[i, j)` is a valid range.	Equivalent to `a.insert(t)` for each object `t` that is pointed to by an iterator in the range `[i, j)`. Each element is inserted into `a`.	The size of `a` is incremented by `j - i`.

Complexity guarantees

The range constructor, and range constructor with compare, are in general O(N * log(N)), where N is the size of the range. However, they are linear in N if the range is already sorted by value_comp().

Insert with hint is logarithmic in general, but it is amortized constant time if t is inserted immediately before p.

Insert range is in general O(N * log(N)), where N is the size of the range. However, it is linear in N if the range is already sorted by value_comp().

Invariants

Models

multimap
multiset

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 Input Iterator 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.