[Mono-dev] Could String constructors be redirected to managed methods?

Zoltan Varga vargaz at gmail.com
Mon Jul 10 12:42:22 EDT 2006


  String ctors are handled specially by the runtime, since the size of
the string
which needs to be allocated is dictated by the parameters of the ctor, so we
can't do the usual 'allocate an object, then call its ctor' stuff, the
unmanaged ctor
has to allocate the string object. This is why these ctors are implemented in
unmanaged code.


On 7/10/06, Kornél Pál <kornelpal at gmail.com> wrote:
> Hi,
> The following methods are currently implemented using unmanaged code:
> unsafe public extern String (sbyte *value);
> unsafe public extern String (sbyte *value, int startIndex, int length);
> unsafe public extern String (sbyte *value, int startIndex, int length,
> Encoding enc);
> They all should use Encoding classes (overloads without encoding parameters
> should use Encoding.Default). I think they could be implemented more easily
> and probably much faster using managed code.
> I attached a patch draft that contains CreateString methods that should be
> called instead of unmanaged code to show an example why this could be easier
> and faster.
> Is it possible to redirect these constructors to CreateString methods
> instead of unmanaged functions? If possible how could this be implemented?
> Thanks for your help.
> Kornél
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