Chapter 7.  Db_set

This class is the combination of std::set and hash_set.

By setting database handles of DB_BTREE or DB_HASH type, you will be using the equivalent of std::set or hash_set. This container stores the key in the key element of a key/data pair in the underlying database, but doesn't store anything in the data element. Database and environment handle requirement: The same as that of db_map .

See Also

db_map db_container

Class Template Parameters

kdt

The key data type.

value_type_sub

If kdt is a class/struct type, do not specify anything in this parameter; Otherwise specify ElementHolder<kdt>.

Public Members

Member Description
db_set

Create a std::set/hash_set equivalent associative container.

~db_set
insert

Insert a single key/data pair if the key is not in the container.

operator=

Container content assignment operator.

value_comp

Get value comparison functor.

swap

Swap content with another container.

operator==

Set content equality comparison operator.

operator!=

Inequality comparison operator.

Group

Dbstl Container Classes

db_set

Function Details

db_set(Db *dbp=NULL,
    DbEnv *envp=NULL)
 

Create a std::set/hash_set equivalent associative container.

See the handle requirement in class details to pass correct database/environment handles.

Parameters

dbp

The database handle.

envp

The database environment handle.

db_set(Db *dbp, DbEnv *envp, InputIterator first,
    InputIterator last)
 

Iteration constructor.

Iterates between first and last, copying each of the elements in the range into this container. Create a std::set/hash_set equivalent associative container. Insert a range of elements into the database. The range is [first, last), which contains elements that can be converted to type ddt automatically. This function supports auto-commit. See the handle requirement in class details to pass correct database/environment handles.

Parameters

dbp

The database handle.

envp

The database environment handle.

last

The open boundary of the range.

first

The closed boundary of the range.

db_set(const self &x)
 

Copy constructor.

Create a database and insert all key/data pairs in x into this container. x's data members are not copied. This function supports auto-commit.

Parameters

x

The source container to initialize this container.

Class

db_set