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#tie VARIABLE,CLASSNAME,LIST

This function binds a variable to a package class that will provide the implementation for the variable. VARIABLE is the name of the variable to be enchanted. CLASSNAME is the name of a class implementing objects of correct type. Any additional arguments are passed to the "new()" method of the class (meaningTIESCALAR,TIEARRAY, orTIEHASH). Typically these are arguments such as might be passed to thedbm_open() function of C. The object returned by the "new()" method is also returned by thetie() function, which would be useful if you want to access other methods in CLASSNAME.

Note that functions such askeys() andvalues() may return huge lists when used on large objects, like DBM files. You may prefer to use theeach() function to iterate over such. Example:

    # print out history file offsets    use NDBM_File;    tie(%HIST, 'NDBM_File', '/usr/lib/news/history', 1, 0);    while (($key,$val) = each %HIST) {print $key, ' = ', unpack('L',$val), "\n";    }    untie(%HIST);

A class implementing a hash should have the following methods:

TIEHASH classname, LISTDESTROY thisFETCH this, keySTORE this, key, valueDELETE this, keyEXISTS this, keyFIRSTKEY thisNEXTKEY this, lastkey

A class implementing an ordinary array should have the following methods:

TIEARRAY classname, LISTDESTROY thisFETCH this, keySTORE this, key, value[others TBD]

A class implementing a scalar should have the following methods:

TIESCALAR classname, LISTDESTROY thisFETCH this,STORE this, value

Unlikedbmopen(), thetie() function will not use or require a module for you--you need to do that explicitly yourself. SeeDB_File or theConfig module for interestingtie() implementations.

For further details seeperltie,"tied VARIABLE".

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