Standard Template Library Programmer's Guide

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This document contains reference on SGI STL implementation

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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
Strictly ascending order The elements in a Unique Sorted Associative Container are always arranged in strictly ascending order by key. That is, if a is a Unique Sorted Associative Container, then is_sorted(a.begin(), a.end(), a.value_comp()) is always true . Furthermore, if i and j are dereferenceable iterators in a such that i precedes j , then a.value_comp()(*i, *j) is always true . [2]
Models

• map

• set

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 .

[2] This is a more stringent invariant than that of Sorted Associative Container. In a Sorted Associative Container we merely know that every element is less than or equal to its successor; in a Unique Sorted Associative Container, however, we know that it must be less than its successor.

See also

Associative Container, Sorted Associative Container, Multiple Sorted Associative Container, Hashed Associative Container

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

XA type that is a model of Multiple Sorted Associative Container

aObject of type X

tObject of type X::value_type

kObject of type X::key_type

p, qObject of type X::iterator

cObject of type X::key_compare

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() .

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 .

See also

Associative Container, Sorted Associative Container, Unique Sorted Associative Container Hashed Associative Container

Unique Hashed Associative Container

Category: containers

Component type: concept

Description

A Unique Hashed Associative Container is a Hashed Associative Container that is also a Unique Associative Container. That is, it is a Hashed Associative Container with the property that no two elements in the container have the same key.

Refinement of

Hashed Associative Container, Unique Associative Container

Associated types

None, except for those described in the Hashed Associative Container and Unique Associative Container requirements.

Notation

XA type that is a model of Hashed Associative Container

aObject of type X

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