valgrind LEAK SUMMARY: definitely lost

Question

I write a class 'Data' as following.

//code in .h file
class Data{
private:
    int col = 0;
    int row = 0;
    float **data = NULL;
public:
    //Constructor
    Data();
    Data(int r, int c);
    Data(int r, int c, float **data1);
    Data* getX();
};

//code in .cpp file
Data::~Data(){
    for(int i = 0; i < this->row; i++){
        delete[] this->data[i];
        this->data[i] = nullptr;
    }
    this->row = 0;
    this->col = 0;
}

Data::Data(){
    this->col = 0;
    this->row = 0; 
    this->data = nullptr; 
}


Data::Data(int r, int c,float **data1){
    this->row = r;
    this->col = c;
    this->data = new float*[r];
    for (int i = 0; i < r; i++){
        this->data[i] = new float[c];
        memcpy(this->data[i],data1[i],sizeof(float)*c);
    }
}
Data* Data::getX(){
    if(this->col <= 0) throw missing_data();
    int r = this->row;
    int c = this->col - 1;
    Data *data = new Data(r,c,this->data);
    return data;
}

It can compile and run normally. Then when I scan the code with valgrind, it prompts that the code has a memory leak.

==1247551== 400 bytes in 5 blocks are definitely lost in loss record 181 of 182
==1247551==    at 0x483E217: operator new[](unsigned long) (vg_replace_malloc.c:640)
==1247551==    by 0x11C074: Data::Data(int, int, float**) 
==1247551==    by 0x11C707: Data::getX() 

Where is the memory leak problem in this code? Thank you! Here is my code in main().

    Data *X = this->data->getX();
    GHInfoAF<float> GandH = Divide::APdividebinning(set,ghinfo,X,sbtp->getMaxBining(),tempqpoint);
    G_H.push_back(GandH); 
    delete X;
    X = nullptr; 

Where is the memory leak problem in this code?

Answer 1

In the destructor, I forgot to release the pointer this->data. So, when I add

delete[] this->data; 
this->data = nullptr;

it has been fixed.