New package Memory Allocator

[Jonathan Kliem]

Dear all,

we have created a new package https://pypi.org/project/memory-allocator/ (refactored from a SageMath module). It is just a little extension class, which allocates memory for you and frees all the memory when deallocated. Usage:

    from memory_allocator cimport MemoryAllocator

    cdef int foo():

        cdef MemoryAllocator mem = MemoryAllocator()

        cdef int* foo = <int*> mem.allocarray(100, sizeof(int))

        return foo[53]

    cdef class MyClass:

        cdef MemoryAllocator mem

        cdef int* foo

        def __cinit__(self):

            self.mem = MemoryAllocator()

            self.foo = <int*> self.mem.calloc(100, sizeof(int))

It spares you from writing a custom `__dealloc__` function or from freeing memory at every possible point of exit of a function. `MemoryAllocator` has a small overhead in comparison to `libc.stdlib`: The above function takes about 40ns for me, in contrast to only 9ns that it would take with plain `malloc`/`free`.

For me, this overhead is usually worth it and spares me from code duplication and prevents errors.

Jonathan Kliem