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std::map::merge(3)

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stdman

C++ stdlib man pages

NAME

std::map::merge - std::map::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 the comparison object of *this. If there is an element in *this with key
equivalent to the key of an element from source, then that element is not extracted
from source. 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
(C++17) (public member function)
inserts elements
insert or nodes
(since C++17)
(public member function)

Category:

* Todo no example
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