mf_isblank.sas

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/**
  @file mf_isblank.sas
  @brief Checks whether a macro variable is empty (blank)
  @details Simply performs:
 
      %sysevalf(%superq(param)=,boolean)
 
  Usage:
 
      %put %mf_isblank(&var);
 
  inspiration:
  https://support.sas.com/resources/papers/proceedings09/022-2009.pdf
 
  @param [in] Param VALUE to be checked
 
  @return output returns 1 (if blank) else 0
 
  @version 9.2
**/
 
%macro mf_isblank(param
)/*/STORE SOURCE*/;
 
  %sysevalf(%superq(param)=,boolean)
 
%mend mf_isblank;