High Description
A user reported this bug on the forum: https://root-forum.cern.ch/t/vector-tf1-crash-with-pyroot-6-08/24886/1
This is the reproducer:
import ROOT
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ROOT.gInterpreter.Declare('''
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class F {};
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struct AA {
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AA(){ f= new F();}
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F* f;
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};
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struct BB {
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std::vector<F*> vec;
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void add(AA &a){vec.push_back(a.f);}
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};
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''')
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a=ROOT.AA()
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b=ROOT.BB()
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b.add(a)
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b.add(a)
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print b.vec[0]
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print b.vec[1]
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b.vec.push_back(a.f)
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# print b.vec[2] # crashes
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The interposition of the Python layer in this case causes a problem. Sometimes ROOT informs the user about the fact that the memory location is invalid.
This can be verified as follows:
import ROOT
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ROOT.gInterpreter.Declare('''
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class F {};
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struct AA {
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AA(){ f= new F();}
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F* f;
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};
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struct BB {
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std::vector<F*> vec;
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void add(AA &a){vec.push_back(a.f);}
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};
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AA a;
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BB b;
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''')
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a = ROOT.a
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b = ROOT.b
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b.add(a)
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b.add(a)
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print b.vec[0]
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print b.vec[1]
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b.vec.push_back(a.f)
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ROOT.gInterpreter.ProcessLine("b.vec[0]")
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ROOT.gInterpreter.ProcessLine("b.vec[1]")
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ROOT.gInterpreter.ProcessLine("b.vec[2]")
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