http://d.puremagic.com/issues/show_bug.cgi?id=6967
Summary: template instantiation depends an pragma(msg,
T.stringof) if __traits is used
Product: D
Version: D2
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Tobias Pankrath <[email protected]> 2011-11-17 09:41:24
PST ---
>From a thread in d.learn:
http://www.digitalmars.com/d/archives/digitalmars/D/learn/Strange_behaviour_in_templates_Another_bug_30591.html
I'm trying to learn template meta programming in D. To do this, I'm working
on a��meta state machine like Boost.MSM�
(http://www.boost.org/doc/libs/1_47_0/libs/msm/doc/HTML/index.html).
States are types and can have sub states. If they do, they need to have
an attribut 'SubStates', which should be a TypeTuble with the�
sub states.
The task at hand is: Given a State and a list of all States, create
a list of all parents of State including State itself.
This code (http://paste.pocoo.org/show/506154/) ought to do this
and it works sometimes.�
You can make to interesting observations of this code:
In its current form, 'dmd test.d -unittest' will print: "
> false
But if you uncomment the first pragma() in the unittest block,
it will print�
> ()�
> true
If you change the body of ParentsDesc to�
> alias TypeTuple!() Result;
it will also print
> true
Although the static if in ParentsDesc is never true in this
example.
--
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
