memory-management

问题 How to handle situation when I use ARC and add view of UIViewController? MyViewController *vc = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil]; [someView addSubview:vc.view]; //this retain vc.view because addSubview retain onlu view, not controller, so controller is released. Before ARC there was a way to retain controller as long as neede, but how to prevent ARC to release View Controller? 回答1: I had similar situation solved by declaring vc as property with default

问题 I have no idea what's wrong with the following code! I am deleting all pointers, but when I use the "top" command to watch the memory, I can see that still lots of memory is allocated to the program. Am I missing something here to free the memory? #include <iostream> #include <vector> using namespace std; int main() { vector<int*> container; vector<int*>::iterator itr; unsigned long long i; for(i = 0; i < 10000000; i++) { int* temp = new int(); *temp = 1; container.push_back(temp); } for(itr

问题 I have no idea what's wrong with the following code! I am deleting all pointers, but when I use the "top" command to watch the memory, I can see that still lots of memory is allocated to the program. Am I missing something here to free the memory? #include <iostream> #include <vector> using namespace std; int main() { vector<int*> container; vector<int*>::iterator itr; unsigned long long i; for(i = 0; i < 10000000; i++) { int* temp = new int(); *temp = 1; container.push_back(temp); } for(itr

问题 I am using pointers to pass some arrays to a subroutine and then allocate that array inside that subroutine and send it back to the first subroutine. In one module I have something like this: module call_test subroutine bla use test double precision, dimension(:), pointer :: xyz ! interface boink subroutine boink(a) implicit none double precision, dimension(:), pointer :: a end subroutine boink end interface boink ! call boink(xyz) deallocate(xyz) end subroutine bla end module call_test and

问题 The Lua docs say When a program has no references to a table left, Lua memory management will eventually delete the table and reuse its memory. My question is : Is it possible to count the no of references to a particular table during runtime? 回答1: You can find all references to a Lua value using the debug library. See these messages: http://lua-users.org/lists/lua-l/2012-03/msg00479.html http://lua-users.org/lists/lua-l/2012-04/msg00758.html The luatraverse library found in the below link

问题 The Lua docs say When a program has no references to a table left, Lua memory management will eventually delete the table and reuse its memory. My question is : Is it possible to count the no of references to a particular table during runtime? 回答1: You can find all references to a Lua value using the debug library. See these messages: http://lua-users.org/lists/lua-l/2012-03/msg00479.html http://lua-users.org/lists/lua-l/2012-04/msg00758.html The luatraverse library found in the below link

问题 Is it possible to test if memory leaks occur when running a Unit Test? I want to check if my memory management is handled correctly. Thanks 回答1: You can try running your unit tests under Instruments with the Leak Detection Instrument. However, this will only work for Application (bundle) tests, if you're using OCUnit. If you happen to use something else, please let us know. 来源： https://stackoverflow.com/questions/6570384/xcode-memory-leaks-detection-in-unit-test

问题 I have this example code that has a function text() returning a newly allocated string: ffi_test = FFI() ffi_test.set_source('_test', ''' char* test() { return strdup("hello world"); } ''') ffi_test.cdef(''' char* test(); void free(void *); ''') ffi_test.compile(verbose=True) This works fine: In [1]: from _test import ffi, lib In [2]: x = lib.test() In [3]: ffi.string(x) Out[3]: b'hello world' In [4]: lib.free(x) However, I could not find anything in the docs whether I actually need to

问题 I'm working on a C extension and am at the point where I want to track down memory leaks. From reading Python's documentation it's hard to understand when to increment / decrement reference count of Python objects. Also, after couple days spending trying to embed Python interpreter (in order to compile the extension as a standalone program), I had to give up this endeavor. So, tools like Valgrind are helpless here. So far, by trial and error I learned that, for example, Py_DECREF(Py_None) is

问题 I am creating a particle system in XNA4 and I've bumped into problem. My first particle system was a simple list of particles, whose instances are created when needed. But then I read about using pools. My second system consists of a pool, filled with particles, and an emitter/controller. My pool is pretty basic, this is the code: class Pool<T> where T: new () { public T[] pool; public int nextItem = 0; public Pool(int capacity) { pool = new T[capacity]; for (int i = 0; i < capacity; i++) {