Using operator new and operator delete with a custom memory pool/allocator

Question

I\'m working on a memory pool/memory allocator implementation and I am setting it up in a manor where only a special \"Client\" object type can draw from the pool.The client

Answer 1

You might store additional information just before the returned memory address

#include 
#include 

class Pool {
public:
    static void* Alloc(std::size_t size) { return data; }
    static void Dealloc(void*) {}
private:
    static char data[1024];
};
char Pool::data[1024];


class Client
{
public:
    void* operator new(size_t size, Pool& pool);
    void operator delete(void* memory);
};


struct MemoryHeader {
    Pool* pool;
};


void* Client::operator new(size_t size, Pool& pool)
{
    auto header = static_cast(pool.Alloc(sizeof(MemoryHeader) + size));
    std::cout << "    New Header: " << header << '\n';
    header->pool = &pool;
    return header + 1;
}

void Client::operator delete(void* memory)
{
    auto header = static_cast(memory) - 1;
    std::cout << " Delete Header: " << header << '\n';
    header->pool->Dealloc(header);
}

int main()
{
    Pool pool;
    Client* p = new(pool) Client;
    std::cout << "Client Pointer: " << p << '\n';
    delete p;
    return 0;
}