Avoiding __traits(getAttributes, ...) on alias
Stefan Frijters via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Fri May 9 04:53:58 PDT 2014
I've been playing with UDAs a bit and I wanted to find all
variables with a particular attribute in various modules. I
thought I had it cracked, until I added a module that contains an
alias declaration, which makes it choke when trying to execute
__traits(getAttributes, ...). A small example is shown below. Is
there any conditional I can insert between the two foreach lines
to make it detect such an alias declaration, and move on to the
next derived member? Or should getAttributes handle this by just
returning no attributes?
import std.traits;
@("testattr") int foo;
alias char[256] MyChar;
@("testattr") int bar;
void main() {
foreach(e ; __traits(derivedMembers, mixin(__MODULE__))) {
foreach( t; __traits(getAttributes, mixin(e)) ){
pragma(msg, t);
}
}
// testattr
// test.d(9): Error: first argument is not a symbol
// test.d(9): Error: invalid foreach aggregate false
// testattr
}
Any hints would be appreciated!
Kind regards,
Stefan Frijters
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