In Linux, I could use mmap with the MAP_GROWSDOWN flag to allocate memory for an automatically-growing stack. To quote the manpage, MAP_GROWSDOWN This flag is used for stacks. It indicates to the kernel virtual memory system that the mapping should extend downward in memory. The return address is one page lower than the memory area ..
Category : allocation
Windows 10, Visual Studio Community 2019 I am following https://vkguide.dev/docs/chapter-3/triangle_mesh_code/ and it mentions to add #include "vk_mem_alloc.h" and if you compile you will get linker errors. Then it describes that you should put #define VMA_IMPLEMENTATION above the include in the vk_engine.cpp. I understand how this works, and I have only included the define once in ..
I am using different types of data : say double *, double **, Eigen::Matrix< Index, Eigen::Dynamic, Eigen::Dynamic >, std::vector … I am using different codes, and they mix those types, so I would like to avoid copies of datas when passing from one type to another, e.g. say I have double * positions, and in ..
I would like to ask for your advice regarding the use of std::vector container in performing FFT. In my program, I use a certain function (get_PDF_CDF) in a loop. When I perform the FFTs using std::vector containers, during a certain iteration (usually the second one), I am getting a segmentation error / memory corruption errors. ..
For example if an integer array is declared: int ar[12]; And here a vector of integers: vector<int> ar; //OR vector<int> ar(12); In either case, is memory allocated to the array at compile time or runtime? I know that vector class in C++ STL uses dynamic memory allocation but what about the ordinary array? Also: int ..
I have a private array inside a class, allocated dynamically. As I insert more and more items, I need to resize the array at some point. The question is how to do that correctly? The code below ends in a error: munmap_chunk(): invalid pointer while inserting a third item. #include <string> #include <cstring> #include <cassert> ..
I want to write the program in C which would allocate 1000 bytes of memory inside the process, then write number 20 inside each of them, and lastly, deallocate memory. How can I do this using WINDOWS API or POSIX API (using sbrk, HeapAlloc()…)? #include<stdio.h> #include <windows.h> #define heapNew GetProcessHeap() void *malloc(size_t size){ if (heapNew) ..
I have been following the vulkan tutorial, and I have noticed that Vulkan is not freeing all memory that is being allocated. The code below simply creates and destroys a Vulkan instance and overloads the new and delete operators to keep track of how many times memory is being allocated and freed. #define GLFW_INCLUDE_VULKAN #include ..
1.What is the use of dynamic allocating vectors on the heap and is it a good practice? 2.What is the difference between the following:- vector<Object> *col = new vector<Object> vector<Object*> col 3.Does vectors dynamically allocate items on the heap in the following example:- vector<Object> x; or vector<int> x; Source: Windows Que..
im new to c++ and im trying to understand how the "new" keyword works in c++ and when to use it , so i made this little program to test and see how the heap and stack works #include <iostream> #include <string> class Player { private: const std::string name; public: Player() : name("unknown") {} Player(const ..
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