Quick Answer

Using new/delete with exception safety.

Understanding the Issue

Manual memory management requires careful pairing of allocations and deallocations. Prefer RAII wrappers for automatic cleanup.

The Problem

This code demonstrates the issue:

Cpp Error 
// Problem: Memory leak
void process() {
    int* buf = new int[1024];
    if(error) return; // Leak
    delete[] buf;
}

The Solution

Here's the corrected code:

Cpp Fixed 
// Solution 1: Smart pointer
void safe() {
    auto buf = make_unique<int[]>(1024);
    // Automatic deletion
}

// Solution 2: Custom deleter
struct Deleter {
    void operator()(int* p) { delete[] p; }
};
unique_ptr<int[], Deleter> ptr(new int[1024]);

Key Takeaways

Never use raw new/delete in modern C++.