pub fn alloc_extend<I>(&self, iterable: I) -> &mut [T]
    where
        I: IntoIterator<Item = T>,
    {
        let mut iter = iterable.into_iter();

        let mut chunks = self.chunks.borrow_mut();

        let iter_min_len = iter.size_hint().0;
        let mut next_item_index;
        debug_assert!(
            chunks.current.capacity() >= chunks.current.len(),
            "capacity is always greater than or equal to len, so we don't need to worry about underflow"
        );
        if iter_min_len > chunks.current.capacity() - chunks.current.len() {
            chunks.reserve(iter_min_len);
            chunks.current.extend(iter);
            next_item_index = 0;
        } else {
            next_item_index = chunks.current.len();
            let mut i = 0;
            while let Some(elem) = iter.next() {
                if chunks.current.len() == chunks.current.capacity() {
                    // The iterator was larger than we could fit into the current chunk.
                    let chunks = &mut *chunks;
                    // Create a new chunk into which we can freely push the entire iterator into
                    chunks.reserve(i + 1);
                    let previous_chunk = chunks.rest.last_mut().unwrap();
                    let previous_chunk_len = previous_chunk.len();
                    // Move any elements we put into the previous chunk into this new chunk
                    chunks
                        .current
                        .extend(previous_chunk.drain(previous_chunk_len - i..));
                    chunks.current.push(elem);
                    // And the remaining elements in the iterator
                    chunks.current.extend(iter);
                    next_item_index = 0;
                    break;
                } else {
                    chunks.current.push(elem);
                }
                i += 1;
            }
        }
        let new_slice_ref = &mut chunks.current[next_item_index..];

        // Extend the lifetime from that of `chunks_borrow` to that of `self`.
        // This is OK because we’re careful to never move items
        // by never pushing to inner `Vec`s beyond their initial capacity.
        // The returned reference is unique (`&mut`):
        // the `Arena` never gives away references to existing items.
        unsafe { mem::transmute::<&mut [T], &mut [T]>(new_slice_ref) }
    }
/// Uses the contents of an iterator to allocate values in the arena.
/// Returns a mutable slice that contains these values.
///
/// ## Example
///
/// ```
/// use typed_arena::Arena;
///
/// let arena = Arena::new();
/// let abc = arena.alloc_extend("abcdefg".chars().take(3));
/// assert_eq!(abc, ['a', 'b', 'c']);
/// ```
Uses the contents of an iterator to allocate values in the arena.
Returns a mutable slice that contains these values.
Uses the contents of an iterator to allocate values in the arena . Returns a mutable slice that contains these values .
pub fn alloc_extend<I>(&self, iterable: I) -> &mut [T]
    where
        I: IntoIterator<Item = T>,
    {
        let mut iter = iterable.into_iter();
        let mut chunks = self.chunks.borrow_mut();
        let iter_min_len = iter.size_hint().0;
        let mut next_item_index;
        debug_assert!(
            chunks.current.capacity() >= chunks.current.len(),
            "capacity is always greater than or equal to len, so we don't need to worry about underflow"
        );
        if iter_min_len > chunks.current.capacity() - chunks.current.len() {
            chunks.reserve(iter_min_len);
            chunks.current.extend(iter);
            next_item_index = 0;
        } else {
            next_item_index = chunks.current.len();
            let mut i = 0;
            while let Some(elem) = iter.next() {
                if chunks.current.len() == chunks.current.capacity() {
                    // The iterator was larger than we could fit into the current chunk.
                    let chunks = &mut *chunks;
                    // Create a new chunk into which we can freely push the entire iterator into
                    chunks.reserve(i + 1);
                    let previous_chunk = chunks.rest.last_mut().unwrap();
                    let previous_chunk_len = previous_chunk.len();
                    // Move any elements we put into the previous chunk into this new chunk
                    chunks
                        .current
                        .extend(previous_chunk.drain(previous_chunk_len - i..));
                    chunks.current.push(elem);
                    // And the remaining elements in the iterator
                    chunks.current.extend(iter);
                    next_item_index = 0;
                    break;
                } else {
                    chunks.current.push(elem);
                }
                i += 1;
            }
        }
        let new_slice_ref = &mut chunks.current[next_item_index..];
        // Extend the lifetime from that of `chunks_borrow` to that of `self`.
        // This is OK because we’re careful to never move items
        // by never pushing to inner `Vec`s beyond their initial capacity.
        // The returned reference is unique (`&mut`):
        // the `Arena` never gives away references to existing items.
        unsafe { mem::transmute::<&mut [T], &mut [T]>(new_slice_ref) }
    }
pub fn alloc_extend < I > ( & self , iterable : I ) -> & mut [ T ] where I : IntoIterator < Item = T > , { let mut iter = iterable . into_iter ( ) ; let mut chunks = self . chunks . borrow_mut ( ) ; let iter_min_len = iter . size_hint ( ) . 0 ; let mut next_item_index ; debug_assert ! ( chunks current capacity ( ) chunks current len ( ) " " ) ; if iter_min_len > chunks . current . capacity ( ) - chunks . current . len ( ) { chunks . reserve ( iter_min_len ) ; chunks . current . extend ( iter ) ; next_item_index = 0 ; } else { next_item_index = chunks . current . len ( ) ; let mut i = 0 ; while let Some ( elem ) = iter . next ( ) { if chunks . current . len ( ) == chunks . current . capacity ( ) { // The iterator was larger than we could fit into the current chunk. let chunks = & mut * chunks ; // Create a new chunk into which we can freely push the entire iterator into chunks . reserve ( i + 1 ) ; let previous_chunk = chunks . rest . last_mut ( ) . unwrap ( ) ; let previous_chunk_len = previous_chunk . len ( ) ; // Move any elements we put into the previous chunk into this new chunk chunks . current . extend ( previous_chunk . drain ( previous_chunk_len - i .. ) ) ; chunks . current . push ( elem ) ; // And the remaining elements in the iterator chunks . current . extend ( iter ) ; next_item_index = 0 ; break ; } else { chunks . current . push ( elem ) ; } i += 1 ; } } let new_slice_ref = & mut chunks . current [ next_item_index .. ] ; // Extend the lifetime from that of `chunks_borrow` to that of `self`. // This is OK because we’re careful to never move items // by never pushing to inner `Vec`s beyond their initial capacity. // The returned reference is unique (`&mut`): // the `Arena` never gives away references to existing items. unsafe { mem :: transmute :: < & mut [ T ] , & mut [ T ] > ( new_slice_ref ) } }
Uses the contents of an iterator to allocate values in the arena.
Uses the contents of an iterator to allocate values in the arena .
&self
iterable
I
&self
iterable
I
example
```
use typed_arena::Arena.


` ` ` use typed_arena :: Arena .