Оператор delete

#include <iostream>
#include <vector>
#include <string>
 
using namespace std;
 
const uint16_t sizeofbuf = 128;
// 1
// uint16_t offset_ = 4;
// 2
uint16_t offset_ = 50;
 
struct LinearBuffer
{
    uint8_t *mem;
    uint16_t totalSize;
    uint16_t offset;
    LinearBuffer() : totalSize(sizeofbuf), offset(offset_)
    {
        mem = new uint8_t;
    }
    void destroy()
    {
        delete mem;
    }
};
 
void* linearBufferAlloc(LinearBuffer* buf, uint32_t size)
{
    if (!buf || !size)
        return NULL;
    
    uint32_t newOffset = buf->offset + size;
    if (newOffset <= buf->totalSize)
    {
        char ch = 'M';
        char ch1 = 'O';
        char ch2 = 'K';
 
        *(buf->mem) = ch;
        *(buf->mem + 1) = ch1;
        *(buf->mem + 2) = ch2;
        *(buf->mem + offset_) = ch2;
 
        void* ptr = buf->mem + buf->offset;
        buf->offset = newOffset;
        return ptr;
    }
    return NULL;
}
 
int main()
{
    LinearBuffer* lbuf = new LinearBuffer;
    void* my_point = linearBufferAlloc(lbuf, offset_);
    lbuf->destroy();
    cout << *(static_cast<uint8_t*>(my_point) - offset_) << " " << *(static_cast<uint8_t*>(my_point) - (offset_ - 1)) << " " << *(static_cast<uint8_t*>(my_point));
    system("pause");
    return 0;
}

// 1
// uint16_t offset_ = 4;
// 2
uint16_t offset_ = 50;

new uint8_t