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Fixed -Wdeprecated-copy-dtor warnings by implementing a copy assignme… #3306

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Mar 9, 2024
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Fixed -Wdeprecated-copy-dtor warnings by implementing a copy assignme… #3306

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12 changes: 12 additions & 0 deletions c++/src/H5Attribute.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -605,4 +605,16 @@ Attribute::~Attribute()
}
}

//--------------------------------------------------------------------------
// Function: Copy assignment operator
Attribute &
Attribute::operator=(const Attribute &original)
{
if (&original != this) {
setId(original.id);
}
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setId(original.id); needed here so that both objects have the same hdf5 ID (see DataSet, DataType,...)

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Done. This is the crux of the WIP. I'm not sure what to actually put into these copy assignment operators...

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I would say that a copy in this context is the equivalent of (re-)opening the thing in the same way, so you'd want a new, different ID. Unfortunately, we don't have a lightweight way of duplicating an ID, though that could be added pretty easily. There are calls that do what the library would do (e.g., H5Iobject_verify() and H5Iregister()), but we don't allow using those with library ID types (just user-defined ID types).

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@bmribler bmribler Aug 2, 2023 •
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In the HDF5 C++ API, the operator= uses the same ID as the original because if a different ID is created, it won't have the same characteristics as the original ID, specifically, if the rhs represents a named datatype, "this" would still be a transient datatype. At least, that was my understanding at the time. However, I just realized PropList didn't follow that concept but I don't remember why and I don't know if it needs to be fixed... I'll have to look into that.


return *this;
}

} // namespace H5
3 changes: 3 additions & 0 deletions c++/src/H5Attribute.h
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Expand Up @@ -78,6 +78,9 @@ class H5_DLLCPP Attribute : public AbstractDs, public H5Location {
// Destructor: properly terminates access to this attribute.
virtual ~Attribute() override;

// Copy assignment operator.
Attribute &operator=(const Attribute &original);

#ifndef DOXYGEN_SHOULD_SKIP_THIS
protected:
// Sets the attribute id.
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12 changes: 12 additions & 0 deletions c++/src/H5Group.cpp
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Expand Up @@ -274,4 +274,16 @@ Group::~Group()
}
}

//--------------------------------------------------------------------------
// Function: Copy assignment operator
Group &
Group::operator=(const Group &original)
{
if (&original != this) {
setId(original.id);
}
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return *this;
}

} // namespace H5
3 changes: 3 additions & 0 deletions c++/src/H5Group.h
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Expand Up @@ -67,6 +67,9 @@ class H5_DLLCPP Group : public H5Object, public CommonFG {
// Destructor
virtual ~Group() override;

// Copy assignment operator.
Group &operator=(const Group &original);

// Creates a copy of an existing group using its id.
Group(const hid_t group_id);

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