The standard prescribes that an allocator must be equal to its copies, with respect to moves and rebinding. But can it become unequal to its previous state after its member functions are invoked, for example after allocating a value? That is, could this be a compliant allocator? auto allocator_copy = allocator; std::cout << (allocator == ..
Category : allocator
Here topic about jemalloc. I find information that memory allocated by chunks that divided in runs. And arenas curves the chunks. And we use 4*(CPU-count) arenas if CPUs more than one. What is the connection between these statements? I can’t understand how memory organized in jemalloc. What hierarchy are used here? Source: Windows Que..
From https://en.cppreference.com/w/cpp/memory/shared_ptr/allocate_shared: template< class T, class Alloc, class… Args > shared_ptr<T> allocate_shared( const Alloc& alloc, Args&&… args ); The storage is typically larger than sizeof(T) in order to use one allocation for both the control block of the shared pointer and the T object. … All memory allocation is done using a copy of alloc, ..
I’m learn about std::allocator. I try to allocate but use deallocate incorrectly I saw that it didn’t use size argument, I confuse about the method could you please explain for me ? Thanks. testcase1 "test" : I didn’t deallocate, valgrind detected (correct) testcase2 "test_deallocate" : I deallocate with size(0) less than actual size (400),valgrind or ..
Assume we want to copy n bytes of data from void* src to void* dst. It is well-known that standard library implementation of memcpy is heavily optimized for using platform-dependent vectorized instructions and various other tricks to perform copying as fast as possible. Now assume that p bytes of data after src + n are ..
I am trying to figure out what is an "Allocator-Aware Type". I found the name in this video. https://www.youtube.com/watch?v=2LAsqp7UrNs Source: Windows Que..
I am using shared pointers in my code and I need to execute some code before object shared pointer is pointing to is destructed when ref count reaches zero. I came across custom allocator and it seems like it satisfies what I need to do. My plan is to use std::allocate_shared with custom allocator and ..
I am not understanding the plot of this question that I am meant to solve using C++. The question is: Given a huge chunk of memory (void, *base). Write interfaces that allow applications to allocate and release fixed size chunk of memory. Does this question mean to write our own version of malloc and free? ..
C++ allocators (as used by std::vector) are tricky to. I understand that they changed a lot to allow stateful allocators and PMR, leading to some of the cruftiness. My core question is: if allocators are intended to replace new and delete, why do they only provide an API like malloc and free? I understand why, ..
I know that it deprecated and removed only in std::allocator. And I can implement it on my own allocators. But why it is deprecated? Source: Windows Que..
Web Development Company
Recent Comments