Struct BufferPool 

pub struct BufferPool { /* private fields */ }

Reusable buffer pool for intermediate tensor allocations.

Tracks freed Vec<f64> and Vec<Complex64> buffers indexed by length. When a contraction step completes, its input buffers are returned to the pool. Subsequent steps can reuse these buffers instead of allocating fresh.

Uses BTreeMap so pool_acquire can find the smallest buffer ≥ requested size (best-fit), improving reuse when intermediate sizes vary slightly.

Usage

Create a pool and pass it to EinsumCode::evaluate_with_pool to reuse buffers across multiple einsum calls:

let mut pool = BufferPool::new();
code.evaluate_with_pool(operands1, None, Some(&mut pool))?;
code.evaluate_with_pool(operands2, None, Some(&mut pool))?;

Pass None to let each call allocate and free independently (no pooling).

Implementations

impl BufferPool

pub fn new() -> Self

Create an empty buffer pool.