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Martin Vogt updated THRIFT-2220: -------------------------------- Issue Type: Improvement (was: Bug) > Add a new struct structv? > ------------------------- > > Key: THRIFT-2220 > URL: https://issues.apache.org/jira/browse/THRIFT-2220 > Project: Thrift > Issue Type: Improvement > Components: C++ - Compiler > Affects Versions: 0.9.1 > Reporter: Martin Vogt > > Thrift cannot extend structs, but maybe its possible to add a virtual base > struct? > Today I updated the "TBase" patch for gen cpp. > https://issues.apache.org/jira/browse/THRIFT-1712 > After that, I modified the compiler to accept a new struct type, which > describes that the marshalled struct needs to be created before the > read(iproto) starts. (write already is fine, because on writing the > specialized class is already created, only the "read" needs some factory, for > the real implementation) > For example: > struct_v TMVBase <<-- struct_v tell the generator to created the > TBase class with a factory ("v" > for virtual) > service USB { > void martin(1:TMVBase base); > } > This is then generated into someting like this: > uint32_t USB_martin_args::read(::apache::thrift::protocol::TProtocol* iprot) { > [...] > switch (fid) { > case 1: > if (ftype == ::apache::thrift::protocol::T_STRUCT) { > // TBase struct create:this->base > this->base=TMVBase::create(iprot); > xfer += this->base->read(iprot); > this->__isset.base = true; > } else { > xfer += iprot->skip(ftype); > } > break > [..] > This would allow to create the derived classed (from TBase) during marshall, > without the need to define every method with any possible struct. Curently I > have modified thrifty.yy and some other things, so that > yacc actually parse this new "struct_v" type. But the generated source > for it needs to be changed some more. > The Protocolhandlers need to write the struct name on the > wire, of course (which they currenty don' do). > I think I can make a working prototype and post the patch. -- This message was sent by Atlassian JIRA (v6.1#6144)