How do I reduce allocations with reserving and pooling in C++?

Learn how to reduce memory allocations in C++ using techniques like reserving and object pooling to enhance performance and efficiency in your applications.

Memory Management, C++ Performance, Object Pooling, Reserving Memory, C++ Allocations, Optimization Techniques


// Example of reserving and pooling in C++

#include <iostream>
#include <vector>

class Object {
public:
    int value;
    Object(int v) : value(v) {}
};

class ObjectPool {
private:
    std::vector pool;
    size_t size;

public:
    ObjectPool(size_t size) : size(size) {
        pool.reserve(size); // Reserve memory for the objects
        for (size_t i = 0; i < size; ++i) {
            pool.push_back(new Object(0)); // Create objects in the pool
        }
    }

    ~ObjectPool() {
        for (Object* obj : pool) {
            delete obj; // Properly clean up allocated memory
        }
    }

    Object* acquire() {
        for (Object* obj : pool) {
            if (obj->value == 0) { // Simple check to see if the object is free
                return obj;
            }
        }
        return nullptr; // No available objects
    }

    void release(Object* obj) {
        obj->value = 0; // Reset the object state to be reused
    }
};

int main() {
    ObjectPool pool(5); // Create a pool of 5 objects

    Object* obj1 = pool.acquire();
    obj1->value = 42;

    std::cout << "Acquired object with value: " << obj1->value << std::endl;

    pool.release(obj1); // Release the object back to the pool

    return 0;
}

Memory Management C++ Performance Object Pooling Reserving Memory C++ Allocations Optimization Techniques

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