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6.8.1 Positional Access Arguments Interfaces

• - integer ‘count’(void);

  is the number of arguments

• - object ‘lead’(integer p);

  is the argument in the p position

• - object ‘lcall’(object o, integer r, &...);

  is the return of the function indicated by o called with ranges of arguments of the aime function featuring the call and the arguments of the call following range indications. r is the number of subsequent range indications, each expected a triplet of intrinsic integers: an insertion position and the indeces of the first and last arguments to be copied.

  The aime function argument ranges are inserted in the list of used call arguments and insertion positions are interpreted with respect to the latter. If more ranges are to be inserted at the same position, they are inserted in the order in which they appear.

  If the last argument index in a range specification indicates an element prior to the first argument index, the arguments starting with the one indexed first to the end of the list and those from the beginning of the list to the one indexed last are used (as if the list of arguments was circular).

• - object ‘rcall’(object o, integer p, integer f, integer l, &...);

  is the return of the function indicated by o called with the unnamed arguments of the call and the f to l indexed arguments of the aime function featuring the call at the position p in the list of arguments.

  If l indicates an element prior to f the arguments starting with the f indexed one to the end of the list and those from the beginning of the list to the l indexed one are used (as if the list of arguments was circular).

• - void ‘set’(integer p, object o);

  sets the argument in the p position as o

• - object ‘xcall’(object o, &...);

  is the return of the function indicated by o called with the remaining arguments of the call and all the arguments of the aime function featuring the call

• - object ‘$’integer

  evaluates to the argument in position indicated by its argument (same as ‘lead’)

Negative insertion positions and argument indeces are interpreted with respect to the end of the relevant list.

See Negative Indices.