mm-go Generic manual memory management for golang

Golang manages memory via GC and it's good for almost every use case but sometimes it can be a bottleneck. and this is where mm-go comes in to play.

Before using mm-go

Golang doesn't have any way to manually allocate/free memory, so how does mm-go allocate/free? It does so via cgo.
Before considering using this try to optimize your program to use less pointers, as golang GC most of the time performs worse when there is a lot of pointers, if you can't use this lib.
Manual memory management provides better performance (most of the time) but you are 100% responsible for managing it (bugs, segfaults, use after free, double free, ....)
Don't mix Manually and Managed memory (example if you put a slice in a manually managed struct it will get collected because go GC doesn't see the manually allocated struct, use Vector instead)
All data structures provided by the package are manually managed and thus can be safely included in manually managed structs without the GC freeing them, but you have to free them yourself!
Try to minimize calls to cgo by preallocating (using batchallocator/Arena/AllocMany).
Check the docs, test files and read the README.

Installing

go get -u github.com/joetifa2003/mm-go

At a glance

type MyStruct struct {
	a int
	b float32
}

func Example_datastructures() {
	alloc := allocator.NewC()
	defer alloc.Destroy() 

	p := allocator.Alloc[MyStruct](alloc)
	defer allocator.Free(alloc, p)

	p.a = 100
	p.b = 200

	fmt.Println(*p)

	v := vector.New[int](alloc)
	defer v.Free()
	v.Push(15)
	v.Push(70)

	for _, i := range v.Iter() {
		fmt.Println(i)
	}

	l := linkedlist.New[*mmstring.MMString](alloc)
	defer l.Free()
	l.PushBack(mmstring.From(alloc, "hello"))
	l.PushBack(mmstring.From(alloc, "world"))

	for _, i := range l.Iter() {
		fmt.Println(i.GetGoString())
	}

	// Output:
	// {100 200}
	// 15
	// 70
	// hello
	// world
}

mm-go is built around the concept of Allocators, which is an interface that can be implemented and passed around to the library. You use these allocators to allocate memory, and also allocate datastructures like vectors, linkedlists, hashmaps, etc.

Benchmarks

Check the test files and github actions for the benchmarks (linux, macos, windows). mm-go can sometimes be 5-10 times faster.

Run go test ./... -bench=. -count 5 > out.txt && benchstat out.txt


goos: linux
goarch: amd64
pkg: github.com/joetifa2003/mm-go
cpu: AMD Ryzen 7 5800H with Radeon Graphics
                                              │   out.txt    │
                                              │    sec/op    │
LinkedListManaged-16                            605.7µ ± ∞ ¹
LinkedListCAlloc-16                             933.1µ ± ∞ ¹
LinkedListBatchAllocator/bucket_size_100-16     513.3µ ± ∞ ¹
LinkedListBatchAllocator/bucket_size_200-16     405.8µ ± ∞ ¹
LinkedListBatchAllocator/bucket_size_500-16     425.4µ ± ∞ ¹
LinkedListBatchAllocator/bucket_size_10000-16   200.7µ ± ∞ ¹
LinkedListTypedArena/chunk_size_100-16          105.3µ ± ∞ ¹
LinkedListTypedArena/chunk_size_200-16          95.50µ ± ∞ ¹
LinkedListTypedArena/chunk_size_500-16          83.02µ ± ∞ ¹
LinkedListTypedArena/chunk_size_10000-16        75.96µ ± ∞ ¹
geomean                                         240.1µ
¹ need >= 6 samples for confidence interval at level 0.95

pkg: github.com/joetifa2003/mm-go/hashmap
                     │   out.txt    │
                     │    sec/op    │
HashmapGo-16           210.7µ ± ∞ ¹
HashmapCAlloc-16       189.1µ ± ∞ ¹
HashmapBatchAlloc-16   118.2µ ± ∞ ¹
geomean                167.6µ
¹ need >= 6 samples for confidence interval at level 0.95

mm

import "github.com/joetifa2003/mm-go"

Index

func SizeOf[T any]() int
func Zero[T any]() T

func SizeOf

func SizeOf[T any]() int

SizeOf returns the size of T in bytes

Example

fmt.Println(mm.SizeOf[int32]())
fmt.Println(mm.SizeOf[int64]())
// Output:
// 4
// 8

Output

4
8

func Zero

func Zero[T any]() T

Zero returns a zero value of T

allocator

import "github.com/joetifa2003/mm-go/allocator"

Example

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
)

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy()

	ptr := allocator.Alloc[int](alloc)
	defer allocator.Free(alloc, ptr)

	*ptr = 15
	fmt.Println(*ptr)

}

Output

Example (Datastructures)

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/linkedlist"
	"github.com/joetifa2003/mm-go/mmstring"
	"github.com/joetifa2003/mm-go/vector"
)

type MyStruct struct {
	a int
	b float32
}

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy() // all the memory allocated bellow will be freed, no need to free it manually.

	p := allocator.Alloc[MyStruct](alloc)
	defer allocator.Free(alloc, p)

	p.a = 100
	p.b = 200

	fmt.Println(*p)

	v := vector.New[int](alloc)
	defer v.Free()
	v.Push(15)
	v.Push(70)

	for _, i := range v.Iter() {
		fmt.Println(i)
	}

	l := linkedlist.New[*mmstring.MMString](alloc)
	defer l.Free()
	l.PushBack(mmstring.From(alloc, "hello"))
	l.PushBack(mmstring.From(alloc, "world"))

	for _, i := range l.Iter() {
		fmt.Println(i.GetGoString())
	}

}

Output

{100 200}
15
70
hello
world

Index

func Alloc[T any](a Allocator) *T
func AllocMany[T any](a Allocator, n int) []T
func Free[T any](a Allocator, ptr *T)
func FreeMany[T any](a Allocator, slice []T)
func Realloc[T any](a Allocator, slice []T, newN int) []T
type Allocator

func Alloc

func Alloc[T any](a Allocator) *T

Alloc allocates T and returns a pointer to it.

Example

alloc := allocator.NewC()
defer alloc.Destroy()

// So you can do this:
ptr := allocator.Alloc[int](alloc) // allocates a single int and returns a ptr to it
defer allocator.Free(alloc, ptr)   // frees the int (defer recommended to prevent leaks)
*ptr = 15
fmt.Println(*ptr)

// instead of doing this:
ptr2 := (*int)(alloc.Alloc(mm.SizeOf[int]()))
defer alloc.Free(unsafe.Pointer(ptr2))
*ptr2 = 15

fmt.Println(*ptr2)

// Output:
// 15
// 15

Output

15
15

func AllocMany

func AllocMany[T any](a Allocator, n int) []T

AllocMany allocates n of T and returns a slice representing the heap. CAUTION: don't append to the slice, the purpose of it is to replace pointer arithmetic with slice indexing

Example

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
)

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy()

	heap := allocator.AllocMany[int](alloc, 2) // allocates 2 ints and returns it as a slice of ints with length 2
	defer allocator.FreeMany(alloc, heap)      // it's recommended to make sure the data gets deallocated (defer recommended to prevent leaks)

	heap[0] = 15    // changes the data in the slice (aka the heap)
	ptr := &heap[0] // takes a pointer to the first int in the heap
	// Be careful if you do ptr := heap[0] this will take a copy from the data on the heap
	*ptr = 45 // changes the value from 15 to 45
	heap[1] = 70

	fmt.Println(heap[0])
	fmt.Println(heap[1])

}

Output

45
70

func Free

func Free[T any](a Allocator, ptr *T)

FreeMany frees memory allocated by Alloc takes a ptr CAUTION: be careful not to double free, and prefer using defer to deallocate

func FreeMany

func FreeMany[T any](a Allocator, slice []T)

FreeMany frees memory allocated by AllocMany takes in the slice (aka the heap) CAUTION: be careful not to double free, and prefer using defer to deallocate

func Realloc

func Realloc[T any](a Allocator, slice []T, newN int) []T

Realloc reallocates memory allocated with AllocMany and doesn't change underling data

Example

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
)

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy()

	heap := allocator.AllocMany[int](alloc, 2) // allocates 2 int and returns it as a slice of ints with length 2

	heap[0] = 15
	heap[1] = 70

	heap = allocator.Realloc(alloc, heap, 3)
	heap[2] = 100

	fmt.Println(heap[0])
	fmt.Println(heap[1])
	fmt.Println(heap[2])

	allocator.FreeMany(alloc, heap)

}

Output

15
70
100

type Allocator

Allocator is an interface that defines some methods needed for most allocators. It's not a golang interface, so it's safe to use in manually managed structs (will not get garbage collected).

type Allocator struct {
    // contains filtered or unexported fields
}

func NewAllocator

func NewAllocator(allocator unsafe.Pointer, alloc func(allocator unsafe.Pointer, size int) unsafe.Pointer, free func(allocator unsafe.Pointer, ptr unsafe.Pointer), realloc func(allocator unsafe.Pointer, ptr unsafe.Pointer, size int) unsafe.Pointer, destroy func(allocator unsafe.Pointer)) Allocator

NewAllocator creates a new Allocator

Example

package main

import (
	"unsafe"

	"github.com/joetifa2003/mm-go/allocator"
)

func main() {
	// Create a custom allocator
	alloc := allocator.NewAllocator(
		nil,
		myallocator_alloc,
		myallocator_free,
		myallocator_realloc,
		myallocator_destroy,
	)

	// Check how C allocator is implemented
	// or batchallocator source for a reference

	_ = alloc
}

func myallocator_alloc(allocator unsafe.Pointer, size int) unsafe.Pointer {
	return nil
}

func myallocator_free(allocator unsafe.Pointer, ptr unsafe.Pointer) {
}

func myallocator_realloc(allocator unsafe.Pointer, ptr unsafe.Pointer, size int) unsafe.Pointer {
	return nil
}

func myallocator_destroy(allocator unsafe.Pointer) {
}

func NewC

func NewC() Allocator

NewC returns an allocator that uses C calloc, realloc and free.

func (Allocator) Alloc

func (a Allocator) Alloc(size int) unsafe.Pointer

Alloc allocates size bytes and returns an unsafe pointer to it.

func (Allocator) Destroy

func (a Allocator) Destroy()

Destroy destroys the allocator. After calling this, the allocator is no longer usable. This is useful for cleanup, freeing allocator internal resources, etc.

func (Allocator) Free

func (a Allocator) Free(ptr unsafe.Pointer)

Free frees the memory pointed by ptr

func (Allocator) Realloc

func (a Allocator) Realloc(ptr unsafe.Pointer, size int) unsafe.Pointer

Realloc reallocates the memory pointed by ptr with a new size and returns a new pointer to it.

batchallocator

import "github.com/joetifa2003/mm-go/batchallocator"

This allocator purpose is to reduce the overhead of calling CGO on every allocation/free, it also acts as an arena since it frees all the memory when `Destroy` is called. It allocats large chunks of memory at once and then divides them when you allocate, making it much faster. This allocator has to take another allocator for it to work, usually with the C allocator. You can optionally call `Free` on the pointers allocated by batchallocator manually, and it will free the memory as soon as it can. `Destroy` must be called to free internal resources and free all the memory allocated by the allocator.

Example

package main

import (
	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/batchallocator"
)

func main() {
	alloc := batchallocator.New(allocator.NewC()) // by default it allocates page, which is usually 4kb
	defer alloc.Destroy()                         // this frees all  memory allocated by the allocator automatically

	ptr := allocator.Alloc[int](alloc)
	// but you can still free the pointers manually if you want (will free buckets of memory if all pointers depending on it is freed)
	defer allocator.Free(alloc, ptr) // this can removed and the memory will be freed.
}

Example (Arena)

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/batchallocator"
	"github.com/joetifa2003/mm-go/linkedlist"
	"github.com/joetifa2003/mm-go/mmstring"
	"github.com/joetifa2003/mm-go/vector"
)

func main() {
	alloc := batchallocator.New(allocator.NewC())
	defer alloc.Destroy() // all the memory allocated bellow will be freed, no need to free it manually.

	v := vector.New[int](alloc)
	v.Push(15)
	v.Push(70)

	for _, i := range v.Iter() {
		fmt.Println(i)
	}

	l := linkedlist.New[*mmstring.MMString](alloc)
	l.PushBack(mmstring.From(alloc, "hello"))
	l.PushBack(mmstring.From(alloc, "world"))

	for _, i := range l.Iter() {
		fmt.Println(i.GetGoString())
	}

}

Output

15
70
hello
world

Index

func New(a allocator.Allocator, options ...BatchAllocatorOption) allocator.Allocator
type BatchAllocator
type BatchAllocatorOption
- func WithBucketSize(size int) BatchAllocatorOption

func New

func New(a allocator.Allocator, options ...BatchAllocatorOption) allocator.Allocator

New creates a new BatchAllocator and applies optional configuration using BatchAllocatorOption

type BatchAllocator

BatchAllocator manages a collection of memory buckets to optimize small allocations

type BatchAllocator struct {
    // contains filtered or unexported fields
}

type BatchAllocatorOption

type BatchAllocatorOption func(alloc *BatchAllocator)

func WithBucketSize

func WithBucketSize(size int) BatchAllocatorOption

WithBucketSize Option to specify bucket size when creating BatchAllocator You can allocate more memory than the bucketsize in one allocation, it will allocate a new bucket and put the data in it.

Example

alloc := batchallocator.New(
	allocator.NewC(),
	batchallocator.WithBucketSize(mm.SizeOf[int]()*15), // configure the allocator to allocate size of 15 ints per bucket.
)
defer alloc.Destroy()

ptr := allocator.Alloc[int](alloc)
defer allocator.Free(alloc, ptr) // this can be removed and the memory will still be freed on Destroy.

ptr2 := allocator.Alloc[int](alloc) // will not call CGO because there is still enough memory in the Bucket.
defer allocator.Free(alloc, ptr2)   // this can be removed and the memory will still be freed on Destroy.

hashmap

import "github.com/joetifa2003/mm-go/hashmap"

Example

alloc := batchallocator.New(allocator.NewC())
defer alloc.Destroy()

hm := New[int, int](alloc)
defer hm.Free() // can be removed

hm.Set(1, 10)
hm.Set(2, 20)
hm.Set(3, 30)

sumKeys := 0
sumValues := 0
for k, v := range hm.Iter() {
	sumKeys += k
	sumValues += v
}

fmt.Println(sumKeys)
fmt.Println(sumValues)

// Output:
// 6
// 60

Output

6
60

Index

type Hashmap

type Hashmap

Hashmap Manually managed hashmap,

type Hashmap[K comparable, V any] struct {
    // contains filtered or unexported fields
}

func New

func New[K comparable, V any](alloc allocator.Allocator) *Hashmap[K, V]

New creates a new Hashmap with key of type K and value of type V

func (*Hashmap[K, V]) Delete

func (hm *Hashmap[K, V]) Delete(key K)

Delete delete value with key K

func (*Hashmap[K, V]) Free

func (hm *Hashmap[K, V]) Free()

Free frees the Hashmap

func (*Hashmap[K, V]) Get

func (hm *Hashmap[K, V]) Get(key K) (value V, exists bool)

Get takes key K and return value V

func (*Hashmap[K, V]) GetPtr

func (hm *Hashmap[K, V]) GetPtr(key K) (value *V, exists bool)

GetPtr takes key K and return a pointer to value V

func (*Hashmap[K, V]) Iter

func (hm *Hashmap[K, V]) Iter() iter.Seq2[K, V]

Iter returns an iterator over all key/value pairs

func (*Hashmap[K, V]) Keys

func (hm *Hashmap[K, V]) Keys() []K

Keys returns all keys as a slice

func (*Hashmap[K, V]) Set

func (hm *Hashmap[K, V]) Set(key K, value V)

Set inserts a new value V if key K doesn't exist, Otherwise update the key K with value V

func (*Hashmap[K, V]) Values

func (hm *Hashmap[K, V]) Values() []V

Values returns all values as a slice

linkedlist

import "github.com/joetifa2003/mm-go/linkedlist"

Example

alloc := allocator.NewC()
defer alloc.Destroy()

ll := New[int](alloc)
defer ll.Free()

ll.PushBack(1)
ll.PushBack(2)
ll.PushBack(3)
ll.PushBack(4)

fmt.Println("PopBack:", ll.PopBack())
fmt.Println("PopFront:", ll.PopFront())

for _, i := range ll.Iter() {
	fmt.Println(i)
}

// Output:
// PopBack: 4
// PopFront: 1
// 2
// 3

Output

PopBack: 4
PopFront: 1
2
3

Index

type LinkedList

type LinkedList

LinkedList a doubly-linked list. Note: can be a lot slower than Vector but sometimes faster in specific use cases

type LinkedList[T any] struct {
    // contains filtered or unexported fields
}

func New

func New[T any](alloc allocator.Allocator) *LinkedList[T]

New creates a new linked list.

func (*LinkedList[T]) At

func (ll *LinkedList[T]) At(idx int) T

At gets value T at idx.

func (*LinkedList[T]) AtPtr

func (ll *LinkedList[T]) AtPtr(idx int) *T

AtPtr gets a pointer to value T at idx.

func (*LinkedList[T]) FindIndex

func (ll *LinkedList[T]) FindIndex(f func(value T) bool) (idx int, ok bool)

FindIndex returns the first index of value T that pass the test implemented by the provided function.

func (*LinkedList[T]) FindIndexes

func (ll *LinkedList[T]) FindIndexes(f func(value T) bool) []int

FindIndex returns all indexes of value T that pass the test implemented by the provided function.

func (*LinkedList[T]) ForEach

func (ll *LinkedList[T]) ForEach(f func(idx int, value T))

ForEach iterates through the linked list.

func (*LinkedList[T]) Free

func (ll *LinkedList[T]) Free()

Free frees the linked list.

func (*LinkedList[T]) Iter

func (ll *LinkedList[T]) Iter() iter.Seq2[int, T]

Iter returns an iterator over the linked list values.

func (*LinkedList[T]) Len

func (ll *LinkedList[T]) Len() int

Len gets linked list length.

func (*LinkedList[T]) PopBack

func (ll *LinkedList[T]) PopBack() T

PopBack pops and returns value T from the back of the linked list.

func (*LinkedList[T]) PopFront

func (ll *LinkedList[T]) PopFront() T

PopFront pops and returns value T from the front of the linked list.

func (*LinkedList[T]) PushBack

func (ll *LinkedList[T]) PushBack(value T)

PushBack pushes value T to the back of the linked list.

func (*LinkedList[T]) PushFront

func (ll *LinkedList[T]) PushFront(value T)

PushFront pushes value T to the back of the linked list.

func (*LinkedList[T]) Remove

func (ll *LinkedList[T]) Remove(f func(idx int, value T) bool) (value T, ok bool)

Remove removes the first value T that pass the test implemented by the provided function. if the test succeeded it will return the value and true

func (*LinkedList[T]) RemoveAll

func (ll *LinkedList[T]) RemoveAll(f func(idx int, value T) bool) []T

RemoveAll removes all values of T that pass the test implemented by the provided function.

func (*LinkedList[T]) RemoveAt

func (ll *LinkedList[T]) RemoveAt(idx int) T

RemoveAt removes value T at specified index and returns it.

minheap

import "github.com/joetifa2003/mm-go/minheap"

Example

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/minheap"
)

func int_less(a, b int) bool { return a < b }

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy()

	h := minheap.New[int](alloc, int_less)

	// Push some values onto the heap
	h.Push(2)
	h.Push(1)
	h.Push(4)
	h.Push(3)
	h.Push(5)

	// Pop the minimum value from the heap
	fmt.Println(h.Pop())
	fmt.Println(h.Pop())

}

Output

1
2

Example (-ax Heap)

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/minheap"
)

func int_greater(a, b int) bool { return a > b }

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy()

	h := minheap.New[int](alloc, int_greater)

	// Push some values onto the heap
	h.Push(2)
	h.Push(1)
	h.Push(4)
	h.Push(3)
	h.Push(5)

	// Pop the max value from the heap
	fmt.Println(h.Pop())
	fmt.Println(h.Pop())

}

Output

5
4

Index

type MinHeap

type MinHeap

type MinHeap[T any] struct {
    // contains filtered or unexported fields
}

func New

func New[T any](alloc allocator.Allocator, less func(a, b T) bool) *MinHeap[T]

New creates a new MinHeap.

func (*MinHeap[T]) Free

func (h *MinHeap[T]) Free()

Free frees the heap.

func (*MinHeap[T]) Iter

func (h *MinHeap[T]) Iter() iter.Seq2[int, T]

Iter returns an iterator over the elements of the heap.

func (*MinHeap[T]) Len

func (h *MinHeap[T]) Len() int

Len returns the number of elements in the heap.

func (*MinHeap[T]) Peek

func (h *MinHeap[T]) Peek() T

Peek returns the minimum value from the heap without removing it.

func (*MinHeap[T]) Pop

func (h *MinHeap[T]) Pop() T

Pop removes and returns the minimum value from the heap.

func (*MinHeap[T]) Push

func (h *MinHeap[T]) Push(value T)

Push adds a value to the heap.

func (*MinHeap[T]) Remove

func (h *MinHeap[T]) Remove(f func(T) bool)

Remove the first element that makes f return true

mmstring

import "github.com/joetifa2003/mm-go/mmstring"

Example

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/mmstring"
)

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy()

	s := mmstring.New(alloc)
	defer s.Free()

	s.AppendGoString("Hello ")
	s.AppendGoString("World")

	s2 := mmstring.From(alloc, "Foo Bar")
	defer s2.Free()

	fmt.Println(s.GetGoString())
	fmt.Println(s2.GetGoString())

}

Output

Hello World
Foo Bar

Example (Datastructures)

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/batchallocator"
	"github.com/joetifa2003/mm-go/mmstring"
	"github.com/joetifa2003/mm-go/vector"
)

func main() {
	alloc := batchallocator.New(allocator.NewC())
	defer alloc.Destroy() // all the memory allocated bellow will be freed, no need to free it manually.

	m := vector.New[*mmstring.MMString](alloc)
	m.Push(mmstring.From(alloc, "hello"))
	m.Push(mmstring.From(alloc, "world"))

	for k, v := range m.Iter() {
		fmt.Println(k, v.GetGoString())
	}

}

Output

0 hello
1 world

Index

type MMString

type MMString

MMString is a manually manged string that is basically a *Vector[rune] and contains all the methods of a vector plus additional helper functions

type MMString struct {
    // contains filtered or unexported fields
}

func From

func From(alloc allocator.Allocator, input string) *MMString

From creates a new manually managed string, And initialize it with a go string

func New

func New(alloc allocator.Allocator) *MMString

New create a new manually managed string

func (*MMString) AppendGoString

func (s *MMString) AppendGoString(input string)

AppendGoString appends go string to manually managed string

func (*MMString) Free

func (s *MMString) Free()

Free frees MMString

func (*MMString) GetGoString

func (s *MMString) GetGoString() string

GetGoString returns go string from manually managed string. CAUTION: You also have to free the MMString

typedarena

import "github.com/joetifa2003/mm-go/typedarena"

typedarena is a growable typed arena that allocates memory in fixed chunks , it's faster that batchallocator but more limited, you can use batchallocator if you want to allocate multiple different types, and you want to use an arena like behavior spanning multiple datastructures (like vector, linkedlist, hashmap etc..), typedarena is much faster when you are only allocating one type.

Example

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/typedarena"
)

type Entity struct {
	VelocityX float32
	VelocityY float32
	PositionX float32
	PositionY float32
}

func main() {
	alloc := allocator.NewC()
	defer alloc.Destroy()

	arena := typedarena.New[Entity](
		alloc,
		10,
	)
	defer arena.Free() // frees all memory

	for i := 0; i < 10; i++ {
		e := arena.Alloc() // *Entity
		e.VelocityX = float32(i)
		e.VelocityY = float32(i)
		e.PositionX = float32(i)
		e.PositionY = float32(i)
		fmt.Println(e.VelocityX, e.VelocityY, e.PositionX, e.PositionY)
	}

	entities := arena.AllocMany(10) // allocate slice of 10 entities (cannot exceed 10 here because chunk size is 10 above, this limitation doesn't exist in batchallocator)

	_ = entities

}

Output

Index

type TypedArena

type TypedArena

TypedArena is a growable typed arena

type TypedArena[T any] struct {
    // contains filtered or unexported fields
}

func New

func New[T any](alloc allocator.Allocator, chunkSize int) *TypedArena[T]

New creates a typed arena with the specified chunk size. a chunk is the the unit of the arena, if T is int for example and the chunk size is 5, then each chunk is going to hold 5 ints. And if the chunk is filled it will allocate another chunk that can hold 5 ints. then you can call FreeArena and it will deallocate all chunks together

func (*TypedArena[T]) Alloc

func (ta *TypedArena[T]) Alloc() *T

Alloc allocates T from the arena

func (*TypedArena[T]) AllocMany

func (ta *TypedArena[T]) AllocMany(n int) []T

AllocMany allocates n of T and returns a slice representing the heap. CAUTION: don't append to the slice, the purpose of it is to replace pointer arithmetic with slice indexing CAUTION: n cannot exceed chunk size

func (*TypedArena[T]) Free

func (ta *TypedArena[T]) Free()

Free frees all allocated memory

vector

import "github.com/joetifa2003/mm-go/vector"

Example

package main

import (
	"fmt"

	"github.com/joetifa2003/mm-go/allocator"
	"github.com/joetifa2003/mm-go/vector"
)

func main() {
	alloc := allocator.NewC()
	v := vector.New[int](alloc)
	v.Push(1)
	v.Push(2)
	v.Push(3)

	fmt.Println("Length:", v.Len())
	for i := 0; i < v.Len(); i++ {
		fmt.Println(v.At(i))
	}

	for _, k := range v.Iter() {
		fmt.Println(k)
	}

}

Output

Length: 3
1
2
3
1
2
3

Index

type Vector

type Vector

Vector a contiguous growable array type

type Vector[T any] struct {
    // contains filtered or unexported fields
}

func Init

func Init[T any](alloc allocator.Allocator, values ...T) *Vector[T]

Init initializes a new vector with the T elements provided and sets it's len and cap to len(values)

func New

func New[T any](aloc allocator.Allocator, args ...int) *Vector[T]

New creates a new empty vector, if args not provided it will create an empty vector, if only one arg is provided it will init a vector with len and cap equal to the provided arg, if two args are provided it will init a vector with len = args[0] cap = args[1]

func (*Vector[T]) At

func (v *Vector[T]) At(idx int) T

At gets element T at specified index

func (*Vector[T]) AtPtr

func (v *Vector[T]) AtPtr(idx int) *T

AtPtr gets element a pointer of T at specified index

func (*Vector[T]) Cap

func (v *Vector[T]) Cap() int

Cap gets vector capacity (underling memory length).

func (*Vector[T]) Free

func (v *Vector[T]) Free()

Free deallocats the vector

func (*Vector[T]) Iter

func (v *Vector[T]) Iter() iter.Seq2[int, T]

Iter iterates over the vector

func (*Vector[T]) Last

func (v *Vector[T]) Last() T

Last gets the last element from a vector

func (*Vector[T]) Len

func (v *Vector[T]) Len() int

Len gets vector length

func (*Vector[T]) Pop

func (v *Vector[T]) Pop() T

Pop pops value T from the vector and returns it

func (*Vector[T]) Push

func (v *Vector[T]) Push(value T)

Push pushes value T to the vector, grows if needed.

func (*Vector[T]) RemoveAt

func (v *Vector[T]) RemoveAt(idx int) T

func (*Vector[T]) Set

func (v *Vector[T]) Set(idx int, value T)

Set sets element T at specified index

func (*Vector[T]) Slice

func (v *Vector[T]) Slice() []T

Slice gets a slice representing the vector CAUTION: don't append to this slice, this is only used if you want to loop on the vec elements

func (*Vector[T]) UnsafeAt

func (v *Vector[T]) UnsafeAt(idx int) T

UnsafeAT gets element T at specified index without bounds checking

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mm-go Generic manual memory management for golang

Before using mm-go

Installing

At a glance

Benchmarks

mm

Index

func SizeOf

Output

func Zero

allocator

Output

Output

Index

func Alloc

Output

func AllocMany

Output

func Free

func FreeMany

func Realloc

Output

type Allocator

func NewAllocator

func NewC

func (Allocator) Alloc

func (Allocator) Destroy

func (Allocator) Free

func (Allocator) Realloc

batchallocator

Output

Index

func New

type BatchAllocator

type BatchAllocatorOption

func WithBucketSize

hashmap

Output

Index

type Hashmap

func New

func (*Hashmap[K, V]) Delete

func (*Hashmap[K, V]) Free

func (*Hashmap[K, V]) Get

func (*Hashmap[K, V]) GetPtr

func (*Hashmap[K, V]) Iter

func (*Hashmap[K, V]) Keys

func (*Hashmap[K, V]) Set

func (*Hashmap[K, V]) Values

linkedlist

Output

Index

type LinkedList

func New

func (*LinkedList[T]) At

func (*LinkedList[T]) AtPtr

func (*LinkedList[T]) FindIndex

func (*LinkedList[T]) FindIndexes

func (*LinkedList[T]) ForEach

func (*LinkedList[T]) Free

func (*LinkedList[T]) Iter

func (*LinkedList[T]) Len

func (*LinkedList[T]) PopBack

func (*LinkedList[T]) PopFront

func (*LinkedList[T]) PushBack

func (*LinkedList[T]) PushFront

func (*LinkedList[T]) Remove

func (*LinkedList[T]) RemoveAll

func (*LinkedList[T]) RemoveAt

minheap

Output

Output

Index

type MinHeap