Home / Forums / Writing Custom STL Allocators for std::vector and std::map in C++

UnreliableCode Community

Developer Research, Reverse Engineering & Coding Community

Source

Writing Custom STL Allocators for std::vector and std::map in C++

KronoDev
C++ / Game Modder
MEMBER
Rep: 195
Join Date: Jan 2023
Posts: 32
Thanks: 48
11mo ago · Sep 12, 2025 2:40 PM
#1
Implementing the C++17 allocator requirements (allocate, deallocate, value_type) to route STL containers through custom memory arenas.
KronoDev - Keep coding, keep learning
The following users thanked KronoDev for this post:
VectorByte
Graphics & DirectX Dev
VIP
Rep: 420
Join Date: Aug 2022
Posts: 39
Thanks: 115
11mo ago · Sep 12, 2025 4:30 PM
#2
std::pmr (Polymorphic Memory Resources) in C++17 makes custom allocators even simpler with std::pmr::monotonic_buffer_resource.
VectorByte | DirectX 11/12 Hooking & ImGui Overlays
Quote
Math is the language of game engines.
DarkLogic
Game Logic & SDK Developer
MEMBER
Rep: 180
Join Date: Jun 2024
Posts: 28
Thanks: 41
11mo ago · Sep 12, 2025 10:30 PM
#3
Using stack-allocated monotonic buffers for temporary vectors inside frame loops eliminated 100% of malloc/free heap lock contention.
DarkLogic | Virtual method tables & SDKs