Contributed by Alex1957

UnsafeFixedVector

import

from Vector import UnsafeFixedVector

Init

You can reserve memory to add elements without the cost of copying everything if it grows too large.

Statically allocate 4 elements, and reserve a capacity of 8 elements

var vec = UnsafeFixedVector[Int](8)

append

To add elements to the vector, you can use the append method:

vec.append(10)
vec.append(20)

print(len(vec))

2

variables

print(vec.capacity)
print(vec.data[0])
print(vec.size)

8
10
2

indexing

You can access and assign elements using indexes

WARNING

No bounds checking, can access garbage data

print(vec[0])

10

vec[1] = 42
print(vec[1])

42

WARNING

Setting elements this way won't increase the len so may lead to errors, you should only use append to add a new element, and use this to modify existing elements

print(len(vec))
vec[6] = 10
print(len(vec))

2
2

copying

This will result in a shallow copy, it'll be a pointer to the same location in memory:

var vec2 = vec

If we modify vec then vec2 will also be updated:

vec[0] = 99
print(vec2[0])

99

There is no deep copy for this type

clear

Deallocates the data in the vector

vec.clear()
print(vec[1])

0