Double Free inside of a destructor upon adding to a vector
- by Shawn B
Hey, I am working on a drum machine, and am having problems with vectors.
Each Sequence has a list of samples, and the samples are ordered in a vector. However, when a sample is push_back on the vector, the sample's destructor is called, and results in a double free error.
Here is the Sample creation code:
class XSample
{
public:
Uint8 Repeat;
Uint8 PlayCount;
Uint16 Beats;
Uint16 *Beat;
Uint16 BeatsPerMinute;
XSample(Uint16 NewBeats,Uint16 NewBPM,Uint8 NewRepeat);
~XSample();
void GenerateSample();
void PlaySample();
};
XSample::XSample(Uint16 NewBeats,Uint16 NewBPM,Uint8 NewRepeat)
{
Beats = NewBeats;
BeatsPerMinute = NewBPM;
Repeat = NewRepeat-1;
PlayCount = 0;
printf("XSample Construction\n");
Beat = new Uint16[Beats];
}
XSample::~XSample()
{
printf("XSample Destruction\n");
delete [] Beat;
}
And the 'Dynamo' code that creates each sample in the vector:
class XDynamo
{
public:
std::vector<XSample> Samples;
void CreateSample(Uint16 NewBeats,Uint16 NewBPM,Uint8 NewRepeat);
};
void XDynamo::CreateSample(Uint16 NewBeats,Uint16 NewBPM,Uint8 NewRepeat)
{
Samples.push_back(XSample(NewBeats,NewBPM,NewRepeat));
}
Here is main():
int main()
{
XDynamo Dynamo;
Dynamo.CreateSample(4,120,2);
Dynamo.CreateSample(8,240,1);
return 0;
}
And this is what happens when the program is run:
Starting program: /home/shawn/dynamo2/dynamo
[Thread debugging using libthread_db enabled]
XSample Construction
XSample Destruction
XSample Construction
XSample Destruction
*** glibc detected *** /home/shawn/dynamo2/dynamo: double free or corruption (fasttop): 0x0804d008 ***
However, when the delete [] is removed from the destructor, the program runs perfectly.
What is causing this? Any help is greatly appreciated.
