Recently, I've been using a package called MyHDL (a hardware description
language using Python), I like it, but it has one particular wart that
bites me a lot.
As a guy who uses HDL's, I'm used to things like (yeah, I do verilog,
does it show?):
a = b;
a <= b;
Which basically "connects" b to a. The terminology isn't that important
as to what "connects" means.
What MyHDL does is:
a.next = b
No big deal, right. Well... This means that:
a = b
is generally an error. The problem: you can't actually flag this.
Assignment in python isn't operating on objects, it's operating on the
namespace dictionary.
What you really want is:
a = SomeClass() # Just fine
a.next = val # Also just fine
a = b # Fail ...
This doesn't seem to be able to be done in Python.
Now C/C++ can do this via either a const pointer to non-const data (C)
or by overloading with assignment operator of a class (C++). However,
it gets "lucky" simply because that function is built into the language.
So my question: What other languages *can* pull this off?
Thanks,
-a
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