Change request #689
GXmlNode append method should clone node.
| Status: | Closed | Start date: | 01/11/2013 | |
|---|---|---|---|---|
| Priority: | Normal | Due date: | ||
| Assigned To: |  Knödlseder Jürgen | % Done: | 100% | |
| Category: | - | |||
| Target version: | 00-08-00 | |||
| Duration: |
Description
The GXmlNode method actually appends a pointer to a node, hence if the node gets deleted, the result becomes invalid.
The following Python code leads to a segmentation fault:
spectrum = GXmlElement()
spectrum.attribute("type", "ExpCutoff")
spectrum.append(prefactor)
spectrum.append(index)
spectrum.append(cutoff)
spectrum.append(scale)
but the following code works
spectrum = GXmlElement()
spectrum.attribute("type", "ExpCutoff")
spectrum.append(prefactor.clone())
spectrum.append(index.clone())
spectrum.append(cutoff.clone())
spectrum.append(scale.clone())
The append method should always clone the node. Instead of passing a pointer, a reference should be passed.
Recurrence
No recurrence.
Related issues
History
#1
Updated by Knödlseder Jürgen over 13 years ago
- Target version set to 00-08-00
#2
Updated by Knödlseder Jürgen over 13 years ago
I’m not really sure about this anymore, at least it requires careful consideration.
For example, the GModelSky::write relies on appending a pointer. The code
// If no source with corresponding name was found then append one
if (src == NULL) {
src = new GXmlElement("source");
src->attribute("name") = name();
if (spectral() != NULL) src->append(new GXmlElement("spectrum"));
if (spatial() != NULL) src->append(new GXmlElement("spatialModel"));
xml.append(src); // Appends pointer
}
// Set model attributes
src->attribute("name", name());
src->attribute("type", type());
std::string instruments = this->instruments();
if (instruments.length() > 0) {
src->attribute("instrument", instruments);
}
assumes that
src still handles the object that has been appended to xml.
THIS CHANGE REQUEST NEEDS CAREFUL EVALUATION, AND A GENERAL STRATEGY SHOULD BE DEFINED FOR CONTAINERS OF POINTERS. One consideration is that memory leaks should be avoided. This is not possible if a container simply handles pointers in a dumb way.
#3
Updated by Knödlseder Jürgen almost 13 years ago
- Status changed from New to Closed
- Assigned To set to Knödlseder Jürgen
GXmlNode now clones.
#4
Updated by Knödlseder Jürgen almost 13 years ago
- % Done changed from 0 to 100