On 04.11.2015 20:36, David Kastrup wrote:
Simon Albrecht <simon.albre...@mail.de> writes:
On 04.11.2015 19:24, David Kastrup wrote:
Simon Albrecht <simon.albre...@mail.de> writes:
This compiles fine inasmuch as the output is just as intended, but it
does sport a:
<0>"/home/simon/lilypond/tests/wrap-multiple-books.ly:17:1: error: bad
expression type
\printParts one.two"
Is this worth a bug report about this error appearing too easily?
No. You use map instead of for-each,
How would I use for-each here? I’m not familiar with that.
for-each has exactly the same arguments as map but does not return a
value.
you use define-scheme-function instead of define-void-function.
Ah, I see. I wouldn’t have thought that a function which basically
runs print-book-with-default would classify as a void function.
What do you consider "void" then?
Basically, my notion of a ‘void function’ comes from the LilyPond
documentation, and I’d phrase it as ‘a function which is not executed
for its output (or return value), but for side-effects’, such as
variable definitions &c.
And I thought print-book-with-default was executed in order to output a
‘book’. Is it closer to the truth to say that it only passes the
information on, instead of ‘returning’ or ‘outputting’ it? I’m not quite
into any subtleties of programming…
Yours, Simon
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