The specification mandates reals, but the reference implementation
supports complex numbers. So as implementation extension, support them
as well.
* module/srfi/srfi-64.scm (within-epsilon): Support complex arguments.
---
v2: Use the same test logic as the reference implementation.
v3: Also adjust the docstring.
module/srfi/srfi-64.scm | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/module/srfi/srfi-64.scm b/module/srfi/srfi-64.scm
index 1f60a72e5..0f1b5c117 100644
--- a/module/srfi/srfi-64.scm
+++ b/module/srfi/srfi-64.scm
@@ -776,8 +776,14 @@ Test whether result of @var{test-expr} matches
@var{expected} using
(define (within-epsilon ε)
(λ (expected actual)
- (and (>= actual (- expected ε))
- (<= actual (+ expected ε)))))
+ (let ((e-r (real-part expected))
+ (e-i (imag-part expected))
+ (a-r (real-part actual))
+ (a-i (imag-part actual)))
+ (and (>= a-r (- e-r ε))
+ (<= a-r (+ e-r ε))
+ (>= a-i (- e-i ε))
+ (<= a-i (+ e-i ε))))))
(define-syntax %test-approximate
(λ (x)
@@ -808,6 +814,10 @@ Test whether result of @var{test-expr} matches
@var{expected} using
Test whether result of @var{test-expr} is within @var{error} of
@var{expected}.
+As implementation extension, complex numbers are supported as well. It tests
+whether both real and imaginary parts of @var{test-expr} are within
+@var{error} of real and imaginary parts of @var{expected}.
+
@end defspec")
(define-syntax %test-error
--
2.46.0
