http://d.puremagic.com/issues/show_bug.cgi?id=10875
Summary: Introduce functionLinkageType to mirror
functionLinkage with an enum
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 Andrej Mitrovic <[email protected]> 2013-08-23
04:51:27 PDT ---
Currently std.traits.functionLinkage returns the linkage type, but it returns
it as a string. So if you have generic code, you might end up writing code like
so:
-----
import std.traits;
extern(C) void func()
{
}
void main()
{
enum linkage = functionLinkage!func;
static if (linkage == "c")
{
}
else
static if (linkage == "D")
{
}
}
-----
Unfortunately there's a bug here, there is no lowercase "c" linkage type, only
"C". It would be safer if functionLinkage returned an enum.
But since it's too late to change the return type, I propose we introduce an
enum version:
-----
import std.traits;
extern(C) void func()
{
}
void main()
{
// new trait which returns a LinkageType enum instance
enum linkage = functionLinkageType!func;
static if (linkage == LinkageType.c)
{
}
else
static if (linkage == LinkageType.d)
{
}
}
-----
This will also allow a user to generate code by using EnumMembers on the
LinkageType enum.
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