Node:SRFI-4 - Read Syntax, Next:, Up:SRFI-4

39.5.1 SRFI-4 - Read Syntax

Homogeneous numeric vectors have an external representation (read syntax) similar to normal Scheme vectors, but with an additional tag telling the vector's type.

#u16(1 2 3)

denotes a homogeneous numeric vector of three elements, which are the values 1, 2 and 3, represented as 16-bit unsigned integers. Correspondingly,

#f64(3.1415 2.71)

denotes a vector of two elements, which are the values 3.1415 and 2.71, represented as floating-point values of 64 bit precision.

Please note that the read syntax for floating-point vectors conflicts with Standard Scheme, because there #f is defined to be the literal false value. That means, that with the loaded SRFI-4 module, it is not possible to enter some list like

'(1 #f3)

and hope that it will be parsed as a three-element list with the elements 1, #f and 3. In normal use, this should be no problem, because people tend to terminate tokens sensibly when writing Scheme expressions.