C++ set

摘自C++ Reference

Set定义：

Sets are containers that store unique elements following a specific order.

In a set, the value of an element also identifies it (the value is itself the key, of type T), and each value must be unique. The value of the elements in a set cannot be modified once in the container (the elements are always const), but they can be inserted or removed from the container.

Internally, the elements in a set are always sorted following a specific strict weak ordering criterion indicated by its internal comparison object (of type Compare).

set containers are generally slower than unordered_set containers to access individual elements by their key, but they allow the direct iteration on subsets based on their order.
Sets are typically implemented as binary search trees.

成员函数：

(constructor)  　　

　　　　Construct set (public member function )

(destructor)   　　　

　　　　Set destructor (public member function )

operator= 　　　

　　　　Copy container content (public member function )

Iterators:

begin

Return iterator to beginning (public member function )

end

Return iterator to end (public member function )

rbegin

Return reverse iterator to reverse beginning (public member function )

rend

Return reverse iterator to reverse end (public member function )

cbegin 

Return const_iterator to beginning (public member function )

cend 

Return const_iterator to end (public member function )

crbegin 

Return const_reverse_iterator to reverse beginning (public member function )

crend 

Return const_reverse_iterator to reverse end (public member function )

Capacity:

empty

Test whether container is empty (public member function )

size

Return container size (public member function )

max_size

Return maximum size (public member function )

Modifiers:

insert

Insert element (public member function )

erase

Erase elements (public member function )

swap

Swap content (public member function )

clear

Clear content (public member function )

emplace 

Construct and insert element (public member function )

emplace_hint 

Construct and insert element with hint (public member function )

Observers:

key_comp

Return comparison object (public member function )

value_comp

Return comparison object (public member function )

Operations:

find

Get iterator to element (public member function )

count

Count elements with a specific value (public member function )

lower_bound

Return iterator to lower bound (public member function )

upper_bound

Return iterator to upper bound (public member function )

equal_range

Get range of equal elements (public member function )

Allocator:

get_allocator

Get allocator (public member function )