www.delorie.com/gnu/docs/guile/guile_131.html   search  
 
Buy GNU books!


Guile Reference Manual

[ < ] [ > ]   [ << ] [ Up ] [ >> ]         [Top] [Contents] [Index] [ ? ]

18.2.7.4 Heap Cell Type Information

Heap cells contain a number of entries, each of which is either a scheme object of type SCM or a raw C value of type scm_t_bits. Which of the cell entries contain Scheme objects and which contain raw C values is determined by the first entry of the cell, which holds the cell type information.

Macro: scm_t_bits SCM_CELL_TYPE (SCM x)
For a non-immediate Scheme object x, deliver the content of the first entry of the heap cell referenced by x. This value holds the information about the cell type.

Macro: void SCM_SET_CELL_TYPE (SCM x, scm_t_bits t)
For a non-immediate Scheme object x, write the value t into the first entry of the heap cell referenced by x. The value t must hold a valid cell type.


  webmaster     delorie software   privacy  
  Copyright 2003   by The Free Software Foundation     Updated Jun 2003