feat: move box/arc behind iterators

This commit is contained in:
mokou 2022-07-14 18:17:23 +02:00
parent 016d718a28
commit cf9629cb0e
3 changed files with 37 additions and 37 deletions

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@ -16,7 +16,7 @@
// Make this code compile by filling in a value for `shared_numbers` where the // Make this code compile by filling in a value for `shared_numbers` where the
// first TODO comment is, and create an initial binding for `child_numbers` // first TODO comment is, and create an initial binding for `child_numbers`
// where the second TODO comment is. Try not to create any copies of the `numbers` Vec! // where the second TODO comment is. Try not to create any copies of the `numbers` Vec!
// Execute `rustlings hint arc1` for hints :) // Execute `rustlings hint arc1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE // I AM NOT DONE

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@ -14,7 +14,7 @@
// //
// Note: the tests should not be changed // Note: the tests should not be changed
// //
// Execute `rustlings hint box1` for hints :) // Execute `rustlings hint box1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE // I AM NOT DONE

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@ -748,41 +748,6 @@ can negate the result of what you're doing using `!`, like `assert!(!having_fun(
# STANDARD LIBRARY TYPES # STANDARD LIBRARY TYPES
[[exercises]]
name = "box1"
path = "exercises/standard_library_types/box1.rs"
mode = "test"
hint = """
Step 1
The compiler's message should help: since we cannot store the value of the actual type
when working with recursive types, we need to store a reference (pointer) to its value.
We should, therefore, place our `List` inside a `Box`. More details in the book here:
https://doc.rust-lang.org/book/ch15-01-box.html#enabling-recursive-types-with-boxes
Step 2
Creating an empty list should be fairly straightforward (hint: peek at the assertions).
For a non-empty list keep in mind that we want to use our Cons "list builder".
Although the current list is one of integers (i32), feel free to change the definition
and try other types!
"""
[[exercises]]
name = "arc1"
path = "exercises/standard_library_types/arc1.rs"
mode = "compile"
hint = """
Make `shared_numbers` be an `Arc` from the numbers vector. Then, in order
to avoid creating a copy of `numbers`, you'll need to create `child_numbers`
inside the loop but still in the main thread.
`child_numbers` should be a clone of the Arc of the numbers instead of a
thread-local copy of the numbers.
This is a simple exercise if you understand the underlying concepts, but if this
is too much of a struggle, consider reading through all of Chapter 16 in the book:
https://doc.rust-lang.org/stable/book/ch16-00-concurrency.html
"""
[[exercises]] [[exercises]]
name = "iterators1" name = "iterators1"
path = "exercises/standard_library_types/iterators1.rs" path = "exercises/standard_library_types/iterators1.rs"
@ -868,6 +833,41 @@ The fold method can be useful in the count_collection_iterator function.
For a further challenge, consult the documentation for Iterator to find For a further challenge, consult the documentation for Iterator to find
a different method that could make your code more compact than using fold.""" a different method that could make your code more compact than using fold."""
[[exercises]]
name = "box1"
path = "exercises/standard_library_types/box1.rs"
mode = "test"
hint = """
Step 1
The compiler's message should help: since we cannot store the value of the actual type
when working with recursive types, we need to store a reference (pointer) to its value.
We should, therefore, place our `List` inside a `Box`. More details in the book here:
https://doc.rust-lang.org/book/ch15-01-box.html#enabling-recursive-types-with-boxes
Step 2
Creating an empty list should be fairly straightforward (hint: peek at the assertions).
For a non-empty list keep in mind that we want to use our Cons "list builder".
Although the current list is one of integers (i32), feel free to change the definition
and try other types!
"""
[[exercises]]
name = "arc1"
path = "exercises/standard_library_types/arc1.rs"
mode = "compile"
hint = """
Make `shared_numbers` be an `Arc` from the numbers vector. Then, in order
to avoid creating a copy of `numbers`, you'll need to create `child_numbers`
inside the loop but still in the main thread.
`child_numbers` should be a clone of the Arc of the numbers instead of a
thread-local copy of the numbers.
This is a simple exercise if you understand the underlying concepts, but if this
is too much of a struggle, consider reading through all of Chapter 16 in the book:
https://doc.rust-lang.org/stable/book/ch16-00-concurrency.html
"""
# THREADS # THREADS
[[exercises]] [[exercises]]