[ROOT-8273] TClass::Size() vs TEmulatedCollectionProxy::Sizeof() - SFTJIRA

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root [0] sizeof(std::map<int,std::string>)

(unsigned long) 48

root [2] TClass::GetClass("std::map<int,std::string>")->GetClassSize()

(Int_t) 24

The 24 is coming from

TEmulatedCollectionProxy::Sizeof (this=0x90b160) at include/TEmulatedCollectionProxy.h:78

78	   virtual UInt_t Sizeof() const           {  return sizeof(Cont_t);     }

called from

#0  TClass::Init (this=0x90f000, name=0xe43938 "map<int,string>", cversion=6, typeinfo=0x0, isa=0x0, dfil=0x0, ifil=0x0, dl=-1, il=-1, givenInfo=0x0,

    silent=false) at src/core/meta/src/TClass.cxx:1543

#1  0x00007ffff7c1e53a in TClass::TClass (this=0x90f000, name=0xe43938 "map<int,string>", cversion=6, silent=false)

    at src/core/meta/src/TClass.cxx:1124

#2  0x00007ffff045b337 in TCling::GenerateTClass (this=0x480a70, classname=0xe43938 "map<int,string>", emulation=true, silent=false)

    at src/core/meta/src/TCling.cxx:3607

#3  0x00007ffff7c25d95 in TClass::GetClass (name=0x7ffff7fbe000 "std::map<int,std::string>", load=true, silent=false)

    at src/core/meta/src/TClass.cxx:3013

We should be able to (or must, really) do better than that, esp as PyROOT relies on that number and we do have interpreter info for this class.

is triggering

ROOT-8239 "python: free(): invalid next size (fast)" in PyROOT 6.06.02 and patches