I can crash program (core.exception.InvalidMemoryOperationError) by using __FUNCTION__ in a class ctor

[James Blachly]

On Friday, 18 January 2019 at 15:42:55 UTC, Steven Schveighoffer 
wrote:
> On 1/18/19 10:35 AM, Steven Schveighoffer wrote:
>
>> 
>> https://github.com/blachlylab/dhtslib/blob/master/source/dhtslib/htslib/hts_log.d#L94
>> 
>> 
>> That is your problem. toStringz is going to attempt to 
>> allocate using the GC. Allocating during a GC collection 
>> causes an InvalidMemoryOperationError.
>> 
>> Take that out of your destructor, and you should not cause 
>> that error.
>> 
>> Alternatively, fix the logger so it doesn't use the GC.
>
> If I had to guess why __FUNCTION__ causes it and others do not, 
> then I would say it's because toStringz has particular cases 
> where it DOESN'T allocate, and that depends completely on the 
> length of the string.
>
> https://github.com/dlang/phobos/blob/master/std/string.d#L364-L365
>
> -Steve

Steve: Thanks for your quick reply. Why does manipulation of the 
default constructor, which is never called, affect whether or not 
the destructor throws the error?

James