cpp / expert
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.
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#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
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struct StackAlloc
A minimal allocator conforming to the C++ Standard Library requirements.
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std::vector<int, StackAlloc<int>> v;
Injects the custom allocation logic into the standard vector container.