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原标题:struct pointer member and memory management

我不禁要问,给一位顽固成员带来什么情况,而这个成员指的是一个没有动力分配的变量。 因此:

#include <stdio.h>
#include <stdlib.h>

typedef struct {
    int value;
    int *pointer;
} MyStruct;

int year = 1989;

int main (int argc, const char * argv[]) {

    MyStruct *myStruct = (MyStruct *) malloc(sizeof(MyStruct));

    myStruct->value = 100;
    myStruct->pointer = &year;

    year++;

    printf("%d 
", *myStruct->pointer);

    // what happens to the myStruct->pointer member when we free myStruct ?
    free(myStruct);

    return EXIT_SUCCESS;
}

我假定它已经销毁了正确吗? 如果情况是这样,如果指定哪位指定职能正确的话,情况也是一样的?

类似:

typedef struct {
    int value;
    void (*someFunc)();
} MyStruct;

随后:

void sayHi(){
  printf("hi");
}

...

myStruct->someFunc = sayHi;

无需特别清理,除非我们用小块混凝土建造了建筑? 感谢任何人的见解。

最佳回答

如果您有t malloc(或>etoc/strdup/realloc),你就不必予以免除。 不需要特别的东西——成员在某种情况下可以变换点,按逻辑上说是“拥有”记号。

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