Hi,
On 2 Dez., 10:30, Kei Suzuki <[EMAIL PROTECTED]> wrote:
> (meta #^{:v 1} (vector 1))
>
> Is this by design?
I think you are right. The metadata is assigned to
the list (vector 1). Then the function vector is executed
and you get the vector [1], but the metadata is "lost".
So one could argue, the metadata should be transferred.
However, how do you want to do this consistently?
Consider (meta #^{:v 1} (fn [] 1)). The metadata is
assigned to the list (fn ...). But why should it transfer
the metadata to the return value of the function? And
indeed this is not possible, because it's a number.
Should vector, set and friends behave differently?
I think the point about *reader* macros is, that they
happen at *read* time. However, the call to vector
happens at run-time. So in that case one has to
use with-meta.
One really has to be aware of the different times
when things happen:
- reader macros => read time
- macros => compile time
- functions => run-time
Sincerely
Meikel
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