http://d.puremagic.com/issues/show_bug.cgi?id=4282
Summary: Problem in AAs with fixed size arrays as keys
Product: D
Version: future
Platform: x86
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P2
Component: druntime
AssignedTo: s...@invisibleduck.org
ReportedBy: bearophile_h...@eml.cc
--- Comment #0 from bearophile_h...@eml.cc 2010-06-06 05:37:13 PDT ---
This D2 program, compiles and run with DMD v2.046:
import std.stdio: writeln;
void main() {
char[] txt = cast(char[])("this is just a test".dup);
enum int N = 2;
int[char[N]] aa;
foreach (i; 0 .. txt.length + 1 - N) {
char[2] key = txt[i .. i + N];
aa[key]++;
}
writeln(aa);
}
The correct output:
[[t,h]:1,[i,s]:2,[u,s]:1,[t, ]:1,[ ,t]:1,[e,s]:1,[h,i]:1,[ ,i]:1,[ ,a]:1,[a,
]:1,[t,e]:1,[ ,j]:1,[s, ]:2,[j,u]:1,[s,t]:2]
-----------------
But after this small change:
import std.stdio: writeln;
void main() {
char[] txt = cast(char[])("this is just a test".dup);
enum int N = 2;
int[char[N]] aa;
foreach (i; 0 .. txt.length + 1 - N) {
aa[txt[i .. i + N]]++;
}
writeln(aa);
}
It doesn't work, inside aa goes only one key-value pair.
(Similar traps are very bad in a language. In this situation I suggest to
produce a compile-time error, or better to convert the slice into the correct 2
char array to be used as key).
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