File[string] associative array & initialization of static member

[Artur Skawina]

On 02/12/12 21:21, Vidar Wahlberg wrote:
> Take a look at the following input:
> 
> naushika:~/tmp> cat foo.d
> import std.stdio;
> File[string] files;
> void main() {
>     files["test"] = File("test", "w");
>     files["test"].writefln("meh: %s", "heh");
> }
> naushika:~/tmp> dmd foo.d
> Internal error: ../ztc/cgcs.c 162
> naushika:~/tmp> dmd foo.d -O
> naushika:~/tmp> ./foo
> object.Exception at std/stdio.d(1131): Enforcement failed
> ----------------
> ./foo(pure @safe bool std.exception.enforce!(bool, "std/stdio.d", 1131).enforce(bool, lazy const(char)[])+0x45) [0x45711d]
> ./foo(std.stdio.File.LockingTextWriter std.stdio.File.LockingTextWriter.__ctor(ref std.stdio.File)+0x38) [0x4564ac]
> ./foo(@property std.stdio.File.LockingTextWriter std.stdio.File.lockingTextWriter()+0x29) [0x4565d9]
> ./foo(void std.stdio.File.writefln!(immutable(char)[], immutable(char)[]).writefln(immutable(char)[], immutable(char)[])+0x44) [0x44816c]
> ./foo(_Dmain+0x10f) [0x44811b]
> ./foo(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x17) [0x452e1f]
> ./foo(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void delegate())+0x2a) [0x4529c6]
> ./foo(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x42) [0x452e72]
> ./foo(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void delegate())+0x2a) [0x4529c6]
> ./foo(main+0xd3) [0x452957]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7fbe6cb5cead]
> ----------------
> 
> 
> My first question would be: Why do I get an internal error when I try to compile this code without optimization flag? I'm using "DMD64 D Compiler v2.057".
> 
> Then the second question would be:
> I'm writing a simple module for logging, it's going to write to some few files over a longer duration and my idea was to keep a reference to the handler instead of calling the constructor of File all the time.
> Apparently the way I've tried above was not the right way to do it, any suggestions would be most welcome.

Hmm, the 'files["test"] = File' assignment causes the program to segfault when compiled with GDC.
std.stdio.File.opAssign() calls the dtor which crashes. But why is opAssign being used here?


artur