1
的就是這些文件：錯誤而釋放內存
//============================================================================
// Name : linearMatrix.hpp
// Author : Flores, Facundo Gabriel
// Version : 0.1
// Description : This file contains the linearMatrix class.
//===========================================================================
#ifndef LINEARMATRIX_HPP_
#define LINEARMATRIX_HPP_
class linearMatrix
{
public:
//Constructor
linearMatrix(const int Width, const int Heigth);
//Destructor
~linearMatrix();
//We read a matrix file
void Read_File_Matrix(const char *Path);
//We write a matrix file
void Write_File_Matrix(const char *Path);
//Generate a diagonal dominant matrix
void Generate_Diagonal_Dominant(void);
//Generate a random matrix
void Generate_Random_Matrix(void);
//Copy a float *vector
void Copy_Vector(const float *V, const int Width, const int Heigth);
//Show a little vector
void Show_Little_Matrix(void);
private:
int _Width, _Height; // Width and Height
float* myVector;
//Aux function for testing
bool Test_Sizes(const int Width, const int Heigth);
};
#endif /* LINEARMATRIX_HPP_ */
//============================================================================
// Name : linearMatrix.cpp
// Author : Flores, Facundo Gabriel
// Version : 0.1
// Description : This file contains the linearMatrix implementation class.
// A linear matrix is a vector that represents a matrix.
// We will read this kind of classes from files, because
// they are generally large. But linearMatrix can represent
// a 1D vector if Height is 1.
//============================================================================
#include <iostream>
using std::cout;
using std::endl;
using std::cerr;
using std::bad_alloc;
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <new>
#include "linearMatrix.hpp"
#define FALSE 0
#define TRUE 1
//Test if W and H are correct
bool linearMatrix::Test_Sizes(const int W, const int H)
{
if(W < 1 || W > 32500)
return FALSE;
if(H < 1 || H> 32500)
return FALSE;
return TRUE;
}
// We set the Width and Height parameters
linearMatrix::linearMatrix(const int Width, const int Height)
{
if(Test_Sizes(Width, Height))
{
_Width = Width;
_Height = Height;
try{
myVector = new float[_Width * _Height];
}
catch(bad_alloc &ex)
{
cerr << "Exception:" << ex.what();
exit(1);
}
}
else
{
cout<<"Bad sizes!"<<endl;
exit(1);
}
}
linearMatrix::~linearMatrix()
{
delete [] myVector;
}
//We set a random vector using its Width and Height
void linearMatrix::Generate_Random_Matrix(void)
{
srand(time(NULL));
for(int i = 0; i < _Width; i++)
for(int j = 0; j < _Height; j++)
{
// We are putting a number between 0 and 99
myVector[i * _Width + _Height] = rand() % 100;
}
}
//We set a diagonal dominant matrix
void linearMatrix::Generate_Diagonal_Dominant(void)
{
for(int i = 0; i < _Width; i++)
for(int j = 0; j < _Height; j++)
{
if(i == j) //Diagonal item
myVector[i * _Width + j] = 32500;
else
myVector[i * _Width + j] = 0.5;
}
}
//We copy V into myVector
void linearMatrix::Copy_Vector(const float *V, const int Width, const int Heigth)
{
if(Width != _Width || Heigth != _Height)
{
cout<<"Different sizes, we cannot copy vector V"<<endl;
exit(1);
}
else
{
for(int i = 0; i < _Width; i++)
for(int j = 0; j < _Height; j++)
{
myVector[i * _Width + j] = V[i * Width + j];
}
}
}
//We show a little matrix. Assume H < 11 and W < 11
void linearMatrix::Show_Little_Matrix(void)
{
cout.precision(5);
if(_Height < 11 && _Width < 11)
{
for(int i = 0; i < _Width; i++)
{
for(int j = 0; j < _Height; j++)
{
cout<<myVector[i * _Width + j]<<" ";
}
cout << endl;
}
}
else
{
cout << "I can show only little matrices in the console " << endl;
}
}
void linearMatrix::Write_File_Matrix(const char *Path)
{
FILE *pFile = fopen(Path, "wb");
fwrite(&_Height, sizeof(int), 1, pFile);
fwrite(&_Width, sizeof(int), 1, pFile);
fwrite(myVector, sizeof(float), _Height * _Width, pFile);
fclose(pFile);
}
void linearMatrix::Read_File_Matrix(const char *Path)
{
FILE *pFile = fopen(Path, "rb");
if(pFile == NULL){
cout << "Cannot read :" << Path << endl;
exit(1);
}
fread(&_Height, sizeof(int), 1, pFile);
fread(&_Width, sizeof(int), 1, pFile);
try{
myVector = new float[_Width * _Height];
}
catch(bad_alloc &ex)
{
cout << "Exception:" << ex.what();
exit(1);
}
fread(myVector, sizeof(double), _Height * _Width, pFile);
}
而且我想使用這個類有以下main.cpp：
//============================================================================
// Name : main.cpp
// Author : Flores, Facundo Gabriel
// Version : 0.1
// Description : This file is a test.
//===========================================================================
#include <iostream>
#include "linearMatrix.hpp"
int main(void)
{
linearMatrix Matrix2(3,1);
Matrix2.Generate_Diagonal_Dominant();
Matrix2.Show_Little_Matrix();
return 0;
}
因此錯誤是：
*** glibc detected *** /.../linearMatrix/Debug/linearMatrix: free(): invalid next size (fast): 0x00000000007f1010 ***
我不知道如何使用valgrind呢。但爲什麼錯誤在那裏？該程序向我顯示正確的輸出，但是當析構函數「執行」時，錯誤出現，同時釋放了myVector。如何解決它？
標識符以下劃線開頭，後跟一個大寫字母，比如'_Width'，是[保留]（http://stackoverflow.com/questions/228783/what-are-the-rules-about-using -an-underscore-in-ac-identifier）在任何範圍內。我會牢記這一點。你也沒有注意[三規則]（http://stackoverflow.com/questions/4172722/what-is-the-rule-of-ree）（五），這應該是[規則（http://rmartinho.github.com/2012/08/15/rule-of-zero.html）在這個時代。 – chris
你應該學習如何儘可能快地使用valgrind和調試器。使用valgrind基本命令是：「valgrind --tool = memcheck --leak-check = yes --show-reachable = yes --num-callers = 20 --track-fds = yes ./test」記住關於調試器標誌的內容你的編譯器，在g ++中它是「-g」。 – CyberGuy
@chris。以下劃線開頭的標識符是類linearMatrix的成員。我將閱讀關於三規則和零規則的內容，我從來沒有聽過他們，謝謝。 – FacundoGFlores