Hi Francois,
if you insist on using SPAD for new code I cannot help.
On 03/01/2006 09:56 AM, Francois Maltey wrote:
Hello,
It seems I can define binary operator with the underscore _
in any *.spad file.
In Aldor you don't need the underscore. An underscore is only needed if
you want to write a function "mod_*" because if you write "mod*" that
would mean "mod" "*" (two tokens).
Are the name of the operator are fixed in the compiler or not ?
They are fixed Aldor. You find a list of them in the Aldor User Guide
Section 4.7.1. (http://www.aldor.org/docs/HTML/index.html)
Can I define my own new operator azerty or not ?
If you mean "binary infix operator" then the answer is NO.
for computing 1 azerty 2 azerty 3 azerty 4 without problem.
Can I define my own factorial with ! or not ?
I haven't seen postfix operators in Aldor.
the ! operator is a postfix one. 3!
but the - operator is a prefix one. -3
Why are there 2 underscore in _/_\ in boolean.spad ?
Simple. SPAD does not consider \ and / to be letters that can be used in
an identifier. By escaping them with an _ you basically turn them into
"nice" letters.
Logic: Category == BasicType with
_~: % -> %
++ ~(x) returns the logical complement of x.
_/_\: (%, %) -> %
++ \spadignore { /\ }returns the logical `meet', e.g. `and'.
_\_/: (%, %) -> %
++ \spadignore{ \/ } returns the logical `join', e.g. `or'.
Can I do this in a *.input file for the interpreter ?
No idea.
Can I fix a priority for each operator ?
No. That is fixed in Aldor.
Ralf
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