Ehsan M. Kermani (Modular) Comments

from collections import Set
from testing import assert_true
from memory.unsafe_pointer import initialize_pointee_move

@value
struct IDStruct(KeyElement, Stringable):
    var id: Int

    fn __eq__(self, other: Self) -> Bool:
        return self.id == other.id
    fn __ne__(self, other: Self) -> Bool:
        return self.id != other.id
    fn __hash__(self) -> Int:
        return hash(self.id)
    fn __str__(self) -> String:
        return str(self.id)

fn main() raises:
    var ptr = UnsafePointer[Set[IDStruct]].alloc(10)
    initialize_pointee_move(ptr, Set[IDStruct]())
    assert_true(ptr[0] == Set[IDStruct]())
    # second element
    initialize_pointee_move(ptr + 1, Set[IDStruct](1))
    assert_true(ptr[1] == Set[IDStruct](1))

from collections import Set
from testing import assert_true
from memory.unsafe_pointer import initialize_pointee_move

@value
struct IDStruct(KeyElement, Stringable):
    var id: Int

    fn __eq__(self, other: Self) -> Bool:
        return self.id == other.id
    fn __ne__(self, other: Self) -> Bool:
        return self.id != other.id
    fn __hash__(self) -> Int:
        return hash(self.id)
    fn __str__(self) -> String:
        return str(self.id)

fn main() raises:
    var ptr = UnsafePointer[Set[IDStruct]].alloc(10)
    initialize_pointee_move(ptr, Set[IDStruct]())
    assert_true(ptr[0] == Set[IDStruct]())
    # second element
    initialize_pointee_move(ptr + 1, Set[IDStruct](1))
    assert_true(ptr[1] == Set[IDStruct](1))

15 replies

MModular

•Created by Martin Dudek on 5/10/2024 in #questions

What UnsafePointer can point to and allocate mem for?

Also for completeness, another option currently is via initialize_pointee_move which becomes

15 replies

MModular

•Created by Martin Dudek on 5/10/2024 in #questions

What UnsafePointer can point to and allocate mem for?

To know more about __get_address_as_uninit_lvalue see https://docs.modular.com/mojo/changelog#week-of-2023-04-17

15 replies

MModular

•Created by Martin Dudek on 5/10/2024 in #questions

What UnsafePointer can point to and allocate mem for?

from collections import Set
from testing import assert_true

@value
struct IDStruct(KeyElement, Stringable):
    var id: Int

    fn __eq__(self, other: Self) -> Bool:
        return self.id == other.id
    fn __ne__(self, other: Self) -> Bool:
        return self.id != other.id
    fn __hash__(self) -> Int:
        return hash(self.id)
    fn __str__(self) -> String:
        return str(self.id)

fn main() raises:
    var ptr = UnsafePointer[Set[IDStruct]].alloc(10)
    __get_address_as_uninit_lvalue(ptr.address) = Set[IDStruct]()
    assert_true(ptr[0] == Set[IDStruct]())
    # second element through offset like
    __get_address_as_uninit_lvalue((ptr + 1).address) = Set[IDStruct](1)
    assert_true(ptr[1] == Set[IDStruct](1))

from collections import Set
from testing import assert_true

@value
struct IDStruct(KeyElement, Stringable):
    var id: Int

    fn __eq__(self, other: Self) -> Bool:
        return self.id == other.id
    fn __ne__(self, other: Self) -> Bool:
        return self.id != other.id
    fn __hash__(self) -> Int:
        return hash(self.id)
    fn __str__(self) -> String:
        return str(self.id)

fn main() raises:
    var ptr = UnsafePointer[Set[IDStruct]].alloc(10)
    __get_address_as_uninit_lvalue(ptr.address) = Set[IDStruct]()
    assert_true(ptr[0] == Set[IDStruct]())
    # second element through offset like
    __get_address_as_uninit_lvalue((ptr + 1).address) = Set[IDStruct](1)
    assert_true(ptr[1] == Set[IDStruct](1))

15 replies

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