42 lines
1.9 KiB
C
42 lines
1.9 KiB
C
#include "m-core.h"
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/* This example show how to use the M_LET_IF macro
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that enables to construct an object and continue
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if the construction succeeds.
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*/
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// Stubs defined for the example. Real code will use soundio library.
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struct SoundIo { int x; };
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struct SoundIoDevice { int x; };
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struct SoundIoOutStream { int x; };
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static struct SoundIo *soundio_create(void) { return (struct SoundIo *) malloc(sizeof(struct SoundIo)); }
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static void soundio_destroy(struct SoundIo *s) { free(s); }
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static struct SoundIoDevice *soundio_get_device(struct SoundIo *io, int def) { (void) io; (void) def; return (struct SoundIoDevice *) malloc(sizeof(struct SoundIoDevice)); }
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static void soundio_device_unref(struct SoundIoDevice *s) { free(s); }
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static struct SoundIoOutStream *soundio_outstream_create(struct SoundIoDevice *device) { (void) device ; return (struct SoundIoOutStream *) malloc(sizeof(struct SoundIoOutStream)); }
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static void soundio_outstream_destroy(struct SoundIoOutStream *s) { free(s); }
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static bool soundio_wait_events(struct SoundIo *s) { (void) s; return false; }
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// End of stubs
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int main(void)
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{
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int err = 1;
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/* Example of using M_LET_IF macro to simplify writing error handling code.
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The following code creates some object, test if the object creation succeeds, register the destructor, and print an error if something went wrong
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*/
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M_LET_IF( struct SoundIo *soundio = soundio_create(), soundio != 0 , soundio_destroy(soundio) , fprintf(stderr, "out of memory for soundio\n") )
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M_LET_IF(struct SoundIoDevice *device = soundio_get_device(soundio, -1), device != 0, soundio_device_unref(device), fprintf(stderr, "out of memory for device\n"))
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M_LET_IF(struct SoundIoOutStream *outstream = soundio_outstream_create(device), outstream != 0, soundio_outstream_destroy(outstream), fprintf(stderr, "out of memory for stream\n")) {
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err = 0;
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bool cont = true;
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while (cont)
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cont = soundio_wait_events(soundio);
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}
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return err;
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}
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