std::multimap<Key,T,Compare,Allocator>::merge (3) - Linux Manuals

std::multimap<Key,T,Compare,Allocator>::merge: std::multimap<Key,T,Compare,Allocator>::merge

NAME

std::multimap<Key,T,Compare,Allocator>::merge - std::multimap<Key,T,Compare,Allocator>::merge

Synopsis


template<class C2> (1) (since C++17)
void merge(std::map<Key, T, C2, Allocator>& source);
template<class C2> (2) (since C++17)
void merge(std::map<Key, T, C2, Allocator>&& source);
template<class C2> (3) (since C++17)
void merge(std::multimap<Key, T, C2, Allocator>& source);
template<class C2> (4) (since C++17)
void merge(std::multimap<Key, T, C2, Allocator>&& source);


Attempts to extract ("splice") each element in source and insert it into *this using the comparison object of *this.
No elements are copied or moved, only the internal pointers of the container nodes are repointed. All pointers and references to the transferred elements remain valid, but now refer into *this, not into source.
The behavior is undefined if get_allocator() != source.get_allocator().

Parameters


source - compatible container to transfer the nodes from

Return value


(none)

Exceptions


Does not throw unless comparison throws.

Complexity


N*log(size()+N)), where N is source.size()

Example


 This section is incomplete
 Reason: no example

See also


extract extracts nodes from the container
        (public member function)
(C++17)
        inserts elements
        or nodes
insert (since C++17)
        (public member function)

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