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[io] properly stream TClonesArray with empty slots #17883

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[io] properly stream TClonesArray with empty slots #17883

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3 changes: 2 additions & 1 deletion io/io/src/TStreamerInfoActions.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -2491,7 +2491,8 @@ namespace TStreamerInfoActions
static INLINE_TEMPLATE_ARGS Int_t LoopOverCollection(TBuffer &buf, void *start, const void *end, const TConfiguration *config)
{
for(void *iter = start; iter != end; iter = (char*)iter + sizeof(void*) ) {
action(buf, *(void**)iter, config);
if (*(void**)iter)
action(buf, *(void**)iter, config);
}
return 0;
}
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21 changes: 21 additions & 0 deletions io/io/test/TBufferFileTests.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,12 @@

#include "TBufferFile.h"
#include "TClass.h"
#include "TClonesArray.h"
#include "TObjString.h"
#include <vector>
#include <iostream>
#include <iostream>


// Tests ROOT-8367
TEST(TBufferFile, ROOT_8367)
Expand All @@ -26,3 +30,20 @@ TEST(TBufferFile, ROOT_8367)
EXPECT_FLOAT_EQ(v2[6], 7.);
EXPECT_EQ(v2.size(), 7);
}

// https://its.cern.ch/jira/browse/ROOT-6788
TEST(TBufferFile, ROOT_6788)
{
TClonesArray clArray(TObjString::Class(), 100);
for (Int_t i=0; i<28; i++) {
new (clArray[i]) TObjString();
}
TBufferFile buf(TBuffer::kWrite, 10000);
for (Int_t i=0; i<27; i++) {
delete clArray.RemoveAt(i);
}
buf.SetBufferOffset(0);
buf.MapObject(&clArray);
clArray.Streamer(buf);
}

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