I am trying to implement a custom global allocator for use in my Rust application. The goal is to track memory usage and align to 64 bytes. My allocator uses libc::malloc and libc::free for allocation ...

Reading what is the new feature in c++20 [[no_unique_address]]? , I have been thinking about alternatives to Empty Base Optimisation prior to C++20's [[no_unique_address]]. One thing came to mind, ...

When MSVC move-constructs an std::set, it also move-constructs the allocator. Later, when it destructs the moved-from set, it uses the allocator to deallocate an element. The following explains what ...

I've a hard time understanding why a std container doesn't pass on its allocator to its allocator-aware elements. What are the details I miss here? Why isn't the allocator passed on, when - as I ...

I wrote a memory allocator to use with standard containers. However, every time I try to remove an element from a std::list, the program crashes at the line l.remove(elt). I spent time investigating ...

When I have an object which has allocator aware constructor, I can easily break the code when switching from std::allocator to std::pmr::polymorphic_allocator. It's beacause the polymorphic_allocator ...

I made a really simple arena allocator in C and I was wondering one thing. Here is my header file (by the way if this api does not seems right please tell me!). #ifndef ARENA_H #define ARENA_H #...

I use std::map with a simple compare function and an allocator. Under C++17 with a map pair of std::pair<type1, type2>, I have learned that the allocator return type is required to be std::pair&...

I am playing around with the pmr. I've got this simple code: #include <print> #include <memory_resource> #include <memory> #include <vector> #include <string> #include &...

Background: I encountered this in GCC c++ standard library extension pool_allocator.h, which contains an allocator type that utilize memory pool to improve the efficiency of small chunk memory ...

I have implemented a custom allocator that takes a block of memory from the stack and allocates linearly out of it, ignoring calls to deallocate. This is used with a std::map to improve performance in ...

C++20 added the concept of "destroying delete" which lets you create overloads of operator delete that are required to run the object destructor themselves. Normally the destructor call is ...

I need a custom Allocator to create share_pointer objects ultimately using a pool of dedicated memory. For some classes, however, I will need to further specialize the Allocators. These specialized ...

I'm trying to implement a stack allocator that would work with std::vector. There are plenty of already existing implementations like this or this. However, all of them assume the buffer is not a ...

Assuming alignment is a uintptr_t power of 2, looking for the next properly aligned address can be done using this expression: (address + alignment - 1u) & ~(alignment - 1u) This is used in ...