Matrix struct with Buffer: error at creating

Mojo Standard Library
,
1

Hi,

I am experimenting with Mojo 0.26.3 and I got stuck with my code of struct matrix with a buffer. Could you help me what the issue is with it?

from std.memory import UnsafePointer

comptime RowMajor = "F"
comptime ColMajor = "C"

struct Buffer[T: AnyType, layout: StringLiteral]:
    var storage: UnsafePointer[Self.T, _]
    var rows: Int
    var cols: Int

    def __init__(out self, rows: Int, cols: Int):
        self.rows = rows
        self.cols = cols
        self.storage = alloc[Self.T](rows * cols)

    def __del__(owned self):
        if self.storage:
            self.storage.free()

    def get_offset(self, i: Int, j: Int) -> Int:
        # Indexing is decided here based on the "Buffer type"
        comptime if Self.layout == RowMajor:
            return i * self.cols + j
        else:
            return j * self.rows + i

    def __getitem__(self, i: Int, j: Int) -> Self.T:
        return self.storage.load(self.get_offset(i, j))

    def __setitem__(mut self, i: Int, j: Int, val: Self.T):
        self.storage.store(self.get_offset(i, j), val)

struct Matrix[T: AnyType, layout: StringLiteral]:
    var data: Buffer[Self.T, Self.layout]

    def __init__(out self, rows: Int, cols: Int):
        self.data = Buffer[Self.T, Self.layout](rows, cols)

    def __getitem__(self, i: Int, j: Int) -> Self.T:
        return self.data[i, j]

    def __setitem__(mut self, i: Int, j: Int, val: Self.T):
        self.data[i, j] = val

I get this error:

/home/test_mojo/matrix.mojo:7:31: error: 'UnsafePointer[T, ?]' is not concrete, use '[]' to bind missing parameters
    var storage: UnsafePointer[Self.T, _]
                              ^
/home/test_mojo/matrix.mojo:16:23: error: expected ')' in argument list
    def __del__(owned self):
                      ^
/home/test_mojo/matrix.mojo:14:37: error: ambiguous call to '__init__'
        self.storage = alloc[Self.T](rows * cols)
                       ~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/test_mojo/matrix.mojo:1:1: note: candidate declared here
from std.memory import UnsafePointer
^
/home/test_mojo/matrix.mojo:1:1: note: candidate declared here
from std.memory import UnsafePointer
^
/home/test_mojo/matrix.mojo:28:28: error: no matching method in call to 'load'
        return self.storage.load(self.get_offset(i, j))
               ~~~~~~~~~~~~^~~~~
/home/test_mojo/matrix.mojo:1:1: note: candidate not viable: expected at most 1 positional argument, got 2
from std.memory import UnsafePointer
^
/home/test_mojo/matrix.mojo:1:1: note: candidate not viable: value passed to 'self' cannot be converted from 'UnsafePointer[T, ?]' to 'UnsafePointer[Scalar[dtype], self.origin, address_space=self.address_space]', it depends on an unresolved parameter 'dtype'
from std.memory import UnsafePointer
^
/home/test_mojo/matrix.mojo:1:1: note: candidate not viable: value passed to 'self' cannot be converted from 'UnsafePointer[T, ?]' to 'UnsafePointer[Scalar[dtype], self.origin, address_space=self.address_space]', it depends on an unresolved parameter 'dtype'
from std.memory import UnsafePointer
^
/home/test_mojo/matrix.mojo:31:21: error: no matching method in call to 'store'
        self.storage.store(self.get_offset(i, j), val)
        ~~~~~~~~~~~~^~~~~~
/home/test_mojo/matrix.mojo:1:1: note: candidate not viable: value passed to 'self' cannot be converted from 'UnsafePointer[T, ?]' to 'UnsafePointer[Scalar[dtype], self.origin, address_space=self.address_space]'
from std.memory import UnsafePointer
^
/home/test_mojo/matrix.mojo:1:1: note: candidate not viable: value passed to 'self' cannot be converted from 'UnsafePointer[T, ?]' to 'UnsafePointer[Scalar[dtype], self.origin, address_space=self.address_space]'
from std.memory import UnsafePointer
^
/home/test_mojo/matrix.mojo:1:1: note: candidate not viable: expected at most 2 positional arguments, got 3
from std.memory import UnsafePointer
^
mojo: error: failed to parse the provided Mojo source module

Thank you in advance!