所以我在C ++中测试一些对象数组,之后我试图删除这些对象,就像我应该的那样。
但问题是:deleteInputPattern变量工作正常,所以我能够完全删除CSVFile头类中的“输入”,但它在主文件“inputArray”中的等效项会触发断点。
这是什么问题?我想删除不存在的内存吗?任何指针都需要
下面的代码墙:
#pragma once
class InputTest
{
private:
float r;
float g;
float b;
float t;
public:
InputTest();
~InputTest();
InputTest(float r, float g, float b, float t);
void setR(float newT);
float getR();
void setG(float newT);
float getG();
void setB(float newT);
float getB();
void setT(float newT);
float getT();
void print(int count);
};
#include "InputTest.h"
#include <stdio.h>
InputTest::InputTest()
{
printf("Input constructor\n");
}
InputTest::~InputTest()
{
printf("Input destructor\n");
}
InputTest::InputTest(float r, float g, float b, float t)
{
this->r = r;
this->g = g;
this->b = b;
this->t = t;
}
void InputTest::setR(float newT)
{
r = newT;
}
float InputTest::getR()
{
return r;
}
void InputTest::setG(float newT)
{
g = newT;
}
float InputTest::getG()
{
return g;
}
void InputTest::setB(float newT)
{
b = newT;
}
float InputTest::getB()
{
return b;
}
void InputTest::setT(float newT)
{
t = newT;
}
float InputTest::getT()
{
return t;
}
void InputTest::print(int count)
{
printf("R: %.2f\n", r);
printf("G: %.2f\n", g);
printf("B: %.2f\n", b);
printf("T: %.2f\n", t);
}
#pragma once
class InputTest;
class Copy
{
private:
int patternCount;
InputTest** inputs;
public:
Copy();
~Copy();
InputTest* getInputPattern(int index);
void addInputPattern(InputTest* in);
void deleteInputPattern();
};
#include "Copy.h"
#include "InputTest.h"
#include <string.h>
#include <stdio.h>
Copy::Copy()
{
printf("CSV File constructor\n");
inputs = NULL;
patternCount = 0;
inputs = new InputTest*[3];
int i;
for (i = 0; i < 3; i++)
{
inputs[i] = new InputTest();
}
}
Copy::~Copy()
{
printf("CSV File destructor\n");
}
InputTest * Copy::getInputPattern(int index)
{
printf("input gotten: %d\n", index);
return inputs[index];
}
void Copy::addInputPattern(InputTest * in)
{
inputs[patternCount] = in;
patternCount++;
printf("input added: %d\n", patternCount);
}
void Copy::deleteInputPattern()
{
int i;
for (i = 0; i < patternCount; i++)
{
delete inputs[i];
}
delete inputs;
inputs = NULL;
}
#include "Copy.h"
#include "InputTest.h"
#include <string.h>
#include <stdio.h>
int main(int argv, char** argc)
{
bool testResult = false;
Copy *test = NULL;
test = new Copy();
InputTest **inputArray;
inputArray = new InputTest*[3];
int count;
for (count = 0; count < 3; count++)
{
inputArray[count] = new InputTest();
inputArray[count]->setR(0.2f);
inputArray[count]->setG(0.6f);
inputArray[count]->setB(0.8f);
inputArray[count]->setT(0.5f);
test->addInputPattern(inputArray[count]);
inputArray[count] = test->getInputPattern(count);
printf("next\n");
}
for (count = 0; count < 3; count++)
{
printf("round %d\n", count);
printf("R: %f\n", inputArray[count]->getR());
printf("G: %f\n", inputArray[count]->getG());
printf("B: %f\n", inputArray[count]->getB());
printf("T: %f\n", inputArray[count]->getT());
}
test->deleteInputPattern();
for (count = 0; count < 3; count++)
{
delete inputArray[count];
}
delete inputArray;
delete test;
inputArray = NULL;
test = NULL;
return testResult;
}
答案 0 :(得分:0)
这些似乎是有问题的一行:
test->deleteInputPattern();
for (count = 0; count < 3; count++)
{
delete inputArray[count];
}
由于您已使用test->deleteInputPattern()
删除了该内存,因此将释放该内存。现在,您将使用delete inputArray
在main中显式删除相同的对象(您仍然通过inputArray持有引用)。但是该内存已在deleteInputPattern
中删除,因此您应该收到内存访问错误。
您只需要释放一次已分配的内存。没有必要在main()中再次执行此操作。在main中调用deleteInputPattern或显式调用delete,但不能同时调用两者。我可以推荐2个最佳实践: