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Left Hand Pointer

exprtail

1995 Version of ANSI (Equivalent to Current ISO Version) of Standard

Right Hand Pointer

7.2 Expression tail exprtail

    exprtail::=





binaryop
[ ' ] truthop


expratom

[ ' ] ? pattern




The order of evaluation is as follows:

  1. Evaluate the left-hand expratom.
  2. If an exprtail is present immediately to the right, evaluate its expratom or pattern and apply its operator.
  3. Repeat step b. as necessary, moving to the right.

In the language of operator precedence, this sequence implies that all binary string, arithmetic, and truth-valued operators are at the same precedence level and are applied in left-to-right order.

Any attempt to evaluate an expratom containing an lvn, gvn, or svn with an undefined value is erroneous. A reference to a lvn with an undefined value causes an error condition with ecode="M6". A reference to a gvn with an undefined value causes an error condition with ecode="M7". A reference to a svn with an undefined value causes an error condition with ecode="M8".

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Copyright © Standard Documents; 1977-2018 MUMPS Development Committee;
Copyright © Examples: 1995-2018 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2018 Ed de Moel.

This page most recently updated on 28-Nov-2011, 21:33:04 .

For comments, contact Ed de Moel (demoel@jacquardsystems.com)