Info Catalog gdb: Modula-2 gdb: Built-In Func/Proc

gdb: M2 Operators

 
 15.4.9.1 Operators
 ..................
 
 Operators must be defined on values of specific types.  For instance,
 '+' is defined on numbers, but not on structures.  Operators are often
 defined on groups of types.  For the purposes of Modula-2, the following
 definitions hold:
 
    * _Integral types_ consist of 'INTEGER', 'CARDINAL', and their
      subranges.
 
    * _Character types_ consist of 'CHAR' and its subranges.
 
    * _Floating-point types_ consist of 'REAL'.
 
    * _Pointer types_ consist of anything declared as 'POINTER TO TYPE'.
 
    * _Scalar types_ consist of all of the above.
 
    * _Set types_ consist of 'SET' and 'BITSET' types.
 
    * _Boolean types_ consist of 'BOOLEAN'.
 
 The following operators are supported, and appear in order of increasing
 precedence:
 
 ','
      Function argument or array index separator.
 
 ':='
      Assignment.  The value of VAR ':=' VALUE is VALUE.
 
 '<, >'
      Less than, greater than on integral, floating-point, or enumerated
      types.
 
 '<=, >='
      Less than or equal to, greater than or equal to on integral,
      floating-point and enumerated types, or set inclusion on set types.
      Same precedence as '<'.
 
 '=, <>, #'
      Equality and two ways of expressing inequality, valid on scalar
      types.  Same precedence as '<'.  In GDB scripts, only '<>' is
      available for inequality, since '#' conflicts with the script
      comment character.
 
 'IN'
      Set membership.  Defined on set types and the types of their
      members.  Same precedence as '<'.
 
 'OR'
      Boolean disjunction.  Defined on boolean types.
 
 'AND, &'
      Boolean conjunction.  Defined on boolean types.
 
 '@'
      The GDB "artificial array" operator (Expressions
      Expressions.).
 
 '+, -'
      Addition and subtraction on integral and floating-point types, or
      union and difference on set types.
 
 '*'
      Multiplication on integral and floating-point types, or set
      intersection on set types.
 
 '/'
      Division on floating-point types, or symmetric set difference on
      set types.  Same precedence as '*'.
 
 'DIV, MOD'
      Integer division and remainder.  Defined on integral types.  Same
      precedence as '*'.
 
 '-'
      Negative.  Defined on 'INTEGER' and 'REAL' data.
 
 '^'
      Pointer dereferencing.  Defined on pointer types.
 
 'NOT'
      Boolean negation.  Defined on boolean types.  Same precedence as
      '^'.
 
 '.'
      'RECORD' field selector.  Defined on 'RECORD' data.  Same
      precedence as '^'.
 
 '[]'
      Array indexing.  Defined on 'ARRAY' data.  Same precedence as '^'.
 
 '()'
      Procedure argument list.  Defined on 'PROCEDURE' objects.  Same
      precedence as '^'.
 
 '::, .'
      GDB and Modula-2 scope operators.
 
      _Warning:_ Set expressions and their operations are not yet
      supported, so GDB treats the use of the operator 'IN', or the use
      of operators '+', '-', '*', '/', '=', , '<>', '#', '<=', and '>='
      on sets as an error.
 

Info Catalog gdb: Modula-2 gdb: Built-In Func/Proc