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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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─────C/C++ Language─────────────────────────────────────────────────────────
 
     Data declared with __based is allocated in the segment specified.
 
     Data Stored in a Named Segment
 
     Form of <base>:
 
          __segname(<string literal>)
 
     The <string literal> can be the name of a predefined segment
     ("_CODE", "_CONST", or "_DATA", but not "_STACK"), or it can be
     the name of a new segment you define.
 
     For example:
          // string stored in current code segment
          char __based(__segname("_CODE")) cs[] = "code-based string";
 
     External Data Based on a Segment Variable
 
     Form of <base>:
 
          <segvar>
 
     Data declared this way resides in a location determined at run
     time. You can relocate a segment in memory, set <segvar> to the
     new location of that segment, and access a variable stored in that
     segment without using pointers. Because no space is reserved for
     the variable at compile time, the variable must be declared as
     extern.
 
     For example:
 
          __segment seg1;
          extern char __based(seg1) c;
 
     Data Based on the Address of Another Variable
 
     Form of <base>:
 
          &<var>
 
     The <var> specified must be based on a named segment. This
     declaration places both variables in the same segment.
 
     For example:
          // int stored in segment MYSEGMENT
          int __based(__segname("MYSEGMENT")) myvar1;
 
          int __based( (__segment)&myvar1 ) myvar2;
                                    -♦-