free

问题 Given this code: #include <stdlib.h> typedef struct { int *p; } MyStruct; MyStruct Test() { MyStruct ms; ms.p = malloc(sizeof(int) * 5); if (!ms.p) exit(-1); return ms; } int main(void) { while (1) { MyStruct t = Test(); free(t.p); // C6001: Using uninitialized memory 't.p'. } } Visual Studio shows C6001 warning on the free call line. However, I see there is no way to achieve the free line with the memory t.p uninitialized. What am I missing ? 回答1: Some points: sometimes SAL warnings can be

问题 I'm stuck on this particular function that frees all even nodes from the linked list. I've figured out how to free all the nodes from a linked list but I cannot figure this out. The code i'm posting is very wrong. What I don't understand is how to use a node *temp variable and link it to the head->next node, as the head is what is being freed (because it is even). Also, at the end of the while loop, I know that I need to increment to the next node in the list, but I seem to be doing that

问题 I'm stuck on this particular function that frees all even nodes from the linked list. I've figured out how to free all the nodes from a linked list but I cannot figure this out. The code i'm posting is very wrong. What I don't understand is how to use a node *temp variable and link it to the head->next node, as the head is what is being freed (because it is even). Also, at the end of the while loop, I know that I need to increment to the next node in the list, but I seem to be doing that

问题 I am getting error of "Double free or corruption(out)" after I print my output. But this error is only coming for small inputs. For bigger inputs program doesn't throw that error. When I create the multidimensional arrays inside the main and delete them, I do not get the error. I have only posted the part of the code which is relevant to this issue here. Please kindly explain how to resolve the issue. #include<iostream> #include<vector> using namespace std; class Knapsack{ public: int noItems

问题 I'm just starting to learn coding in c, and I have a few questions regarding 2d matrices in combination with the free() command. I know that you first need to create an array with pointer, pointing to the different columns of the matrix: double **array = (double **)malloc(5*sizeof(double *)); for(int n = 0; n<5; n++){ array[n] = (double *) malloc(6*sizeof(double)); I know that the correct way to then deallocate this matrix is to first deallocate the individual rows and then the array pointer

问题 I have allocated heap memory in the thread function f1 , this storage is used to calculate the value in the heap region so that the main function can see it. Here is the thread function definition: void *f1(void *input){ int sum = (int*)malloc(sizeof(int)); /* Do calculation */ pthread_exit((void*)&sum); } In the above code, the sum is the heap allocated storage, whose address is passed as a return value to the sum1 in the main() . I join the thread in the main() like this: void *sum1;

问题 I have allocated heap memory in the thread function f1 , this storage is used to calculate the value in the heap region so that the main function can see it. Here is the thread function definition: void *f1(void *input){ int sum = (int*)malloc(sizeof(int)); /* Do calculation */ pthread_exit((void*)&sum); } In the above code, the sum is the heap allocated storage, whose address is passed as a return value to the sum1 in the main() . I join the thread in the main() like this: void *sum1;

问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int

问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int

问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int