# Command: cvo

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Name:

    cvo - Label a dictionary for usage as an object in oo-programming
      Synopsis:dict cvo -> dict
      Parameters:The operator modfies its argument
      Description:In SLI dictionaries are used to represent the elements of the
      object oriented programming paradigm. This is natural because the key value
      pairs can specify functions as well as other data. Certain SLI operators like
      SetStatus and GetStatus take C++ objects like nodes and random number distributions
      as arguments but also SLI dictionaries. This enables the same algorithms to operate
      on C++ and SLI objects. In order to avoid confusion with dictionaries not intended
      to be used as an object, some operators require the dictionary to be labeld as
      an object. If the dictionary is not labeles an error is issued. The operator cvdict
      removes the label; cvd is the inverse operator of cvo.

Examples:

      << /c 0 /inc {/c c 1 add def} >> cvo dup  << /c 3 >> SetStatus /c get --> 3

      {<< /c 0 /inc {/c c 1 add def} >> << /c 3 >> SetStatus} stopped
      {3 npop true} {false} ifelse --> true

      Remarks:The labeling is done by inserting the key /__is_object with value true.
      The dictionary is only recognized as labeled if the key exists and its value is
      true. However, usage of this key is considered to be an implementation detail and
      may change in future versions of SLI.

      Author:Diesmann

FirstVersion:

    2008-08-23

SeeAlso:

- cvdict
- call
- SetStatus
- GetStatus

Source:

    /opt/conda/conda-bld/nest_1512418773968/work/nest-2.14.0/lib/sli/oosupport.sli

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