On Friday, 10 February 2017 at 09:03:16 UTC, berni wrote:
Now I tried this with a named instead of a magic constant e.g.
immutable VALUE=-1;
arr.each!"a[]=VALUE";
And it doesn't work anymore. I've no clue, why... Can you help
me?
each is a template. As per the template documentation [1], your
instantiation of each knows nothing about VALUE, because VALUE
declared in the scope in which the template is instantiated.
Template instantiations only have the scope in which they are
implemented, not where they are instantiated, so here each cannot
see VALUE.
On an side note (unrelated to your error), when declaring
constants that are intended to be symbolic (i.e. you never need
to take their address), it's more idiomatic to use manifest
constants (via enum) rather than immutable.
enum value = -1;
[1] https://dlang.org/spec/template.html#instantiation_scope
