On Wed, 25 Jan 2012 10:46:57 -0500, Era Scarecrow <rtcv...@yahoo.com>
wrote:
DMD 2.057 - Windows version
I'm in the middle of converting a medium sized project from C to D.
While I'm doing that I have several static data structures. Here's where
I find myself. Can't probably duplicate the error message without the
full sources.
Since immutable is transitive, this should not cause an error. But I am
getting this one, which repeats 4 times for all four Notepart entries:
Error: cannot implicitly convert expression ("fQuality") of type string
to char[]
//for reference on types
const nLen = 4;
enum ValueType {}
struct Flags {}
alias NotePart NP;
alias ValueType VT;
struct NotePart {
ValueType type;
char[] id;
Flags flags;
int _size;
}
struct SubRecordParts {
char name[nLen];
char requ[nLen];
int size;
NotePart[] notes;
int identifyBy = -1;
}
//immutable should (i think) implicitly change char[] to
immutable(char[])
immutable SubRecordParts subParts[] = [
{"AADT", "", 16, [
NP(VT.ranged_32, "IApparatus"),
NP(VT.float_32, "fQuality"),
NP(VT.float_32, "fWeight"),
NP(VT.i_32, "iuses")]}
];
Your issue is here, (I'm guessing). If do this (after slimming down to a
compilable sample):
alias immutable(NotePart) NP;
then it compiles.
Because the expression (guessing that you have NP aliased to NotePart)
NP(...) is constructing a NotePart and not an *immutable* NotePart, it
cannot resolve that part of the expression, even though the whole
expression is treated as immutable after evaluation.
Maybe there's an enhancement lurking in here...
-Steve
