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NAME
     tt_feature_required - Declare a feature to  be  required  by
     the calling code

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_feature_required ( Tt_feature feature );

DESCRIPTION
     The tt_feature_required() call  declares  a  feature  to  be
     required  by  the  calling code. If the feature requires the
     ToolTalk  service  to  perform  some  initialization   (e.g.
     TT_FEATURE_MULTITHREADED),  the  initialization is performed
     in this call.

     The feature argument is a Tt_feature enum value indicating a
     particular feature to be used by the calling code.

RETURN VALUE
     Upon successful completion, the  tt_feature_required() func-
     tion returns  the status of the operation as one of the fol-
     lowing Tt_status values:

     TT_OK The operation completed successfully.

     TT_WRN_NOT_ENABLED
             The feature has not yet been enabled.

     TT_ERR_UNIMP
             The version of the ToolTalk library linked with  the
             calling code does not support the indicated feature.

     TT_ERR_TOOLATE
             The  indicated  feature  must  be  declared  to   be
             required  before  calls  to the ToolTalk API already
             made.

APPLICATION USAGE
     To use the ToolTalk library in a multithreaded  environment,
     an  application  would declare multithreading to be required
     before a call to tt_open or ttdt_open:

               Tt_status ttstat;
               ttstat = tt_feature_required(TT_FEATURE_MULTITHREADED);
               tt_open();

SEE ALSO
     tt_c(5), tt_open(3), ttdt_open(3), tt_feature_enabled(3)

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