http://d.puremagic.com/issues/show_bug.cgi?id=10127
Summary: TypeEnum in std.variant
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Diggory <[email protected]> 2013-05-21 01:24:15 PDT ---
It would be useful to use the tag part of a tagged union on its own, and it
would fit in well with the rest of std.variant.
It's not always the case that you want to store actual data, sometimes you just
need to store the type. Also sometimes you need to store the data somewhere
else or store it in such a way that you can specify the type first and fill in
the data later.
eg.
alias TypeEnum!(
void,
byte,
short,
string,
Object
) TestTypeEnum;
TestTypeEnum test;
assert(test == TestTypeEnum.from!void);
assert(test != TestTypeEnum.from!byte);
test = TestTypeEnum.from!string;
assert(test == TestTypeEnum.from!string);
assert(test != TestTypeEnum.from!Object);
static assert(!__traits(compiles, TestTypeEnum.from!float));
(pull request shortly)
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