跟踪内存分配以及释放的方法，有助于检查是否有内存泄漏

TrackingMemory.cpp

#include <iostream>
#include <memory>

using namespace std;

struct AllocationMetrics{
    uint32_t totalMemory = 0;
    uint32_t totalFree = 0;
    uint32_t getCurrentUsage() {return totalMemory - totalFree;}
};

static AllocationMetrics s_allocationMetrics;

void* operator new(size_t size){
    cout << "Allocate " << size << " bytes\n";
    s_allocationMetrics.totalMemory += size;
    return malloc(size);
}

void operator delete(void* ptr, size_t size) {
    cout << "Deallocate " << size << " bytes\n";
    s_allocationMetrics.totalFree += size;
    free(ptr);
}

struct ListNode{
    int value;
    ListNode* next;
};


int main(int argc, char* argv[])
{
    {
        auto  pListNode = make_unique<ListNode>();
    }
    cout <<  "CurrentUsage: " << s_allocationMetrics.getCurrentUsage() << endl;
    {
        auto plistNode = new ListNode();
    }
    cout <<  "CurrentUsage: " << s_allocationMetrics.getCurrentUsage() << endl;
    cin.ignore();
    return 0;
}