I have modified it slightly so that the loading view is shown after a tiny delay, and this works fine! So it appears to be something within the same event loop! – (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; // Show load [self performSelector:@selector(doit) withObject:nil afterDelay:0.1]; } – (void)doit { [self presentModalViewController:loader animated:YES]; }
Well, you call new that throws bad_alloc, so you must catch it: try { scoped_array<char> buf(new char[MAX_BUF]); … } catch(std::bad_alloc&) { … } or scoped_array<char> buf(new(nothrow) char[MAX_BUF]); if(!buf) { //allocation failed } What I mean by my answer is that smart pointers propagate exceptions. So if you’re allocating memory with ordinary throwing new, you must … Read more
Rust does not have a garbage collector. Does Rust free up the memory of overwritten variables? Yes, otherwise it’d be a memory leak, which would be a pretty terrible design decision. The memory is freed when the variable is reassigned: struct Noisy; impl Drop for Noisy { fn drop(&mut self) { eprintln!(“Dropped”) } } fn … Read more
Basically, you have two main C++-way choices: std::vector std::unique_ptr I’d prefer the second, since you don’t need all the automatic resizing stuff in std::vector, and you don’t need a container – you need just a buffer. std::unique_ptr has a specialization for dynamic arrays: std::unique_ptr<int[]> will call delete [] in it’s destructor, and will provide you … Read more
Neither language C or C++ has any notion of “segments”, and not all OSs do either, so your question is inevitably dependent on the platform and compiler. That said, common implementations will treat initialized vs. uninitialized variables differently. The main difference is that uninitialized (or default 0-initialized) data does not have to be actually saved … Read more
Lots of type casts are going to just “work well”. However, this is not very strict. Nothing stops you from casting a u32 to a u32 * and dereference it, but this is not following the kernel API and is prone to errors. __iomem is a cookie used by Sparse, a tool used to find … Read more
The first method cannot be used to create dynamic 2D arrays because by doing: int *board[4]; you essentially allocated an array of 4 pointers to int on stack. Therefore, if you now populate each of these 4 pointers with a dynamic array: for (int i = 0; i < 4; ++i) { board[i] = new … Read more
In a normal 32 bit windows app, the process only has 2GB of addressable memory. This is irrelevant to the amount of physical memory that is available. So 2GB available but 1.5 is the max you can allocate. The key is that your code is not the only code running in the process. The other … Read more
Because this is the algorithm for how it expands its capacity. public override void Write(byte[] buffer, int offset, int count) { //… Removed Error checking for example int i = _position + count; // Check for overflow if (i < 0) throw new IOException(Environment.GetResourceString(“IO.IO_StreamTooLong”)); if (i > _length) { bool mustZero = _position > _length; … Read more