Memory Isolation via Custom Allocator Traits

Snippet

Memory Isolation via Custom Allocator Traits

Custom allocators allow you to control how STL containers manage memory. By defining an allocator and passing it as a template argument, you can implement memory pools, stack-based allocation, or logging, ensuring specialized memory handling for high-performance systems.

snippet.cpp

cpp

#include <memory>
#include <vector>
#include <iostream>
 
template <typename T>
struct StackAlloc {
    using value_type = T;
    T* allocate(std::size_t n) {
        std::cout << "Allocating " << n << " items\n";
        return static_cast<T*>(::operator new(n * sizeof(T)));
    }
    void deallocate(T* p, std::size_t n) {
        std::cout << "Deallocating\n";
        ::operator delete(p);
    }
};
 
int main() {
    std::vector<int, StackAlloc<int>> v;
    v.push_back(10);
}

Breakdown

struct StackAlloc

A minimal allocator conforming to the C++ Standard Library requirements.

std::vector<int, StackAlloc<int>> v;

Injects the custom allocation logic into the standard vector container.

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Memory Isolation via Custom Allocator Traits

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