[openbeos-midi] Re: goals update?
- From: Michael Pfeiffer <michael.pfeiffer@xxxxxxxxx>
- To: openbeos-midi@xxxxxxxxxxxxx
- Date: Tue, 04 Jun 2002 22:29:50 +0000
>
>shaggyafterjack <shaggyafterjack@xxxxxxxxx> wrote:
>
>>Also, how to implement a global bsynth object named be_synth globally per
>application and detect
>>the whether it has been initialized or not? Is there an objects database
in
>the be framework that
>>I can do a look up or is it something more fundamental in the language (C++
)
>than that?
>
>This is simple.
>You already have
>extern _IMPEXP_MIDI BSynth *be_synth;
>in the header file.
>
>The only thing you need in you cpp file is a global object, and the pointer
>variable.
>do it like this:
>
>static BSynth be_synth_object;
>BSynth *be_synth = &be_synth_object;
The BeBook describes that the constructor of the other synthesis classes
(BMidiSynth, BMidiSynthFile, ...) create a BSynth object if it does not
already exists.
Not sure if this has to be MT-safe, if it has to be then some kind of
locking mechanism is required.
And I have not found a word about when be_synth will be destroyed as well.
If be_synth is destroyed when an application terminates, it could be
implemented this way:
class BSynthAutoDeleter {
public:
~BSynthAutoDeleter() {
delete be_synth; be_synth = NULL;
}
}
and a global variable:
static BSynthAutoDeleter __delete_be_synth_on_exit;
Any better possibilities to do this?
- Michael
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