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struct some_struct
{
some_struct() = default;
some_struct(SCStudyInterfaceRef sc)
void some_func(const SCDateTimeMS& when);
void record_ID(int a){ Target2OrderIDstop = a;};
void example_using_sc_inside(){sc.SupportTradingScaleIn = true;};
private:
std::unordered_map<SCDateTimeMS, s_SCTradeOrder> something;
int Target2OrderIDstop;

}

const std::int32_t some_struct_pkey = 1;

SCSFExport scsf_some_study(SCStudyInterfaceRef sc)
{

some_struct* ss = reinterpret_cast<some_struct*>(sc.GetPersistentPointer(some_struct_pkey));

if (ss == nullptr)
sc.SetPersistentPointer(some_struct_pkey, new some_struct(sc));

if (sc.SetDefaults)
{

// Do something...

}
//sent order in...
// now record attached order id
ss->record_ID(12356173);
ss->example_using_sc_inside();
// Do something...
if(sc.LastCallToFunction)

delete ss;
}