Can anyone explain to me how this initialization structure actually works?
struct audio_policy_service_ops {
audio_io_handle_t (*open_duplicate_output)(void *service,audio_io_handle_t output1,
int (*close_output)(void *service, audio_io_handle_t output);audio_io_handle_t output2);
int (*suspend_output)(void *service, audio_io_handle_t output);
int (*restore_output)(void *service, audio_io_handle_t output);
};
They are now initialized as shown below:
struct audio_policy_service_ops aps_ops = {
open_duplicate_output : aps_open_dup_output,
close_output : aps_close_output,
suspend_output : aps_suspend_output,
restore_output : aps_restore_output,
};
+3
Pawan kumar thakur
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2 answers
This is GCC's non-standard initialization syntax for structs. It is colloquially referred to as the old-style GNU style init syntax. Its standard equivalent is something like
struct Foo bar = { .name1 = value1, .name2 = value2 };
You can read about this in the GCC documentation .
+7
The Paramagnetic Croissant
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This is GCC-ism. When initializing a structure, one could prefix the initialization values with the name of the structure field. This allows the initializers to follow random order and gives a clearer idea of which field the given values are in.
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Hristo iliev
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