4 ms·

You keep ignoring the point. Show me how can I write a program in C# that works with a fixed size memory region, lets say 512KB. It should not do any dynamic me

• neonsunset 2y ago
  Sigh. // Please, just allocate a normal array instead, there is no benefit to this if it lives throughout the whole application lifetime var bytes = (stackalloc byte[512 * 1024]); // or, but, please, at least use a span instead of C nonsense of tracking offsets by hand // it's not 1980 anymore var ptr = stackalloc byte[512 * 1024]; // byte* // or [InlineArray(256 * 1024)] struct CommandList { byte _; } var commands = new CommandList(); // or unsafe struct State { public fixed byte CommandList[256 * 1024]; } Whichever you like the most, they do have somewhat different implications - stackalloc is C alloca while struct-based definitions have the exact same meaning as in C. To avoid running into stack space limitations, you can place a fixed buffer or any of these large arrays into a static field. It gets a fixed static offset in the memory. C# goes much further and also provides zero-cost abstractions via struct generics with interface constraints. Or without - you can also apply pattern matching against a generic T struct and it will be zero-cost and evaluated at compilation (be it with RyuJIT or ILC (IL AOT Compiler)).
  • waqar144 2y ago
    Nice, thanks a lot for sharing the knowledge.