Greetings!
As I can see, conversion between C structures and google protobuf classes
is a problem that has been avoided for a while. I've searched a bit, and
have found only one way by using ugly macro. It looks like;
#define ROT_CIP_STRUCTURE_NAME t_rot_channel_init_params
#define ROT_CIP_PROTOCLASS_NAME channel_manager::RotChannelInitParams
#define XFIELDS_ROTCIP \
X(unsigned char, rot_idx, "%d", ROT_CIP_STRUCTURE_NAME,
ROT_CIP_PROTOCLASS_NAME) \
X(unsigned short, av_num, "%d", ROT_CIP_STRUCTURE_NAME,
ROT_CIP_PROTOCLASS_NAME) \
X(unsigned long, pw_min_us, "%d", ROT_CIP_STRUCTURE_NAME,
ROT_CIP_PROTOCLASS_NAME) \
X(unsigned long, period_min_us, "%d", ROT_CIP_STRUCTURE_NAME,
ROT_CIP_PROTOCLASS_NAME) \
X(unsigned long, period_max_us, "%d", ROT_CIP_STRUCTURE_NAME,
ROT_CIP_PROTOCLASS_NAME)
typedef struct {
#define X(type, name, format, stype, pclass) type name;
XFIELDS_ROTCIP
#undef X
} ROT_CIP_STRUCTURE_NAME;
And using then:
int extractStructureFromClass(void* dst_structure, void* src_class,
t_reflected_structures entity_type) {
if ((dst_structure == NULL) || (src_class == NULL)) return -EINVAL;
int ret = 0;
#define X(type, name, format, stype, pclass) \
if (static_cast<pclass*>(src_class)->has_##name())
static_cast<stype*>(dst_structure)->name =
static_cast<pclass*>(src_class)->name(); \
else return -ENOENT;
switch (entity_type) {
case TRS_CHANNEL_MANAGER_INIT_PARAMS: {
XFIELDS_ROTCIP
break; }
default: {
ret = -ERANGE;
break; }
}
#undef X
return ret;
}
It may fit for simple structures somehow. But what if I have nested
structures? Oooook...
Y(ADC_CIP_SUBSTRUCT_NAME, ADC_CIP_SUBVARIABLE_NAME, ADC_CIP_SUBCLASS_NAME,
unsigned short, control1, "%d", ADC_CIP_STRUCTURE_NAME,
ADC_CIP_PROTOCLASS_NAME)
Ugly. And what if I have multiple nesting, arrays? It leads to tons of
macro with huge routine work, and It's simple to convert each C structure
manually. But it is so boring! Maybe anyone has found a better way?
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