英文:
Deleting memory in go
问题
我正在使用new在C++中分配内存，然后在我的Go代码中访问它。
有没有办法在Go代码中删除这块内存。
这是我的代码流程：
func f_Go(){
f_C(&buf);//c函数
buff := C.GoBytes(unsafe.Pointer(buf), size) //在访问buf之后，我们必须删除buf以避免内存泄漏
}
void f_C(char *buf){
f_C++(&buf);//c++函数
}
void f_C++(char **buf){ //在这里使用new来分配内存
*buf = new[20];
memcpy(*buf, "hhhhhhjdfkwejfkjkdj", 20);//将内容复制到*buf
}
我能够在Go中以这种方式访问buf，但之后我们必须删除这块内存。
所以我的问题是如何删除这块内存。
英文:
I am allocating memory in c++ using new which I am accessing in my go code.
Is there any way to delete this memory in go code.
This is the flow of my code :
func f_Go(){
f_C(&buf);//c function
buff := C.GoBytes(unsafe.Pointer(buf), size) //after accessing buf we have to delete buf for avoiding memory leak
}
void f_C(char *buf){
f_C++(&buf);//c++ function
}
void f_C++(char **buf){ //here using new I am allocating memory
*buf = new[20];
memcpy(*buf, "hhhhhhjdfkwejfkjkdj", 20);//cpy content into *buf
}
using like this way I am able to access buf there in go but later we have to delete this memory.
So my question is what is the way to delete this memory.
答案1
得分: 2
你可以导出一个执行释放内存的第二个函数。在你的C++文件中可以这样做：
extern "C" {
void create_buf(char **buf) {
*buf = new char[20];
...
}
void free_buf(char **buf) {
delete[] *buf;
*buf = nullptr;
}
}
现在你有另一个可以使用CGo调用的函数来进行清理。
英文:
You can export a second function that performs the deallocation. Something like this should do in your C++ file:
extern "C" {
void create_buf(char **buf) {
*buf = new char[20];
...
}
void free_buf(char **buf) {
delete[] *buf;
*buf = nullptr;
}
}
Now you have another function you can call using CGo to perform the clean up.
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