RAII in C++

RAII is one of the patterns in C++ to manage resources.

Sometimes at some part of the program, we need to allocate some memory and later free it.

template <typename T, std::size_t N>
T* allocateMemory()
{
    return new T[N];
}
template <typename T>
void freeMemory(T *p)
{
    delete[] p;
}
int main()
{
    int *p = allocateMemory<int, 10>();
    // use p
    freeMemory(p);
    
    return 0;
}

Disaster can happen when

1. allocateMemory() is not…