Is gammazero/deque thread-safe for concurrent use in Go?

No, gammazero/deque does not provide built-in concurrency safety. The README explicitly states that concurrency safety is left to the application, so you must use mutexes or channels to synchronize access in multi-goroutine scenarios.

How to implement a stack using gammazero/deque?

Use PushBack to add elements and PopBack to remove them, mimicking LIFO behavior. This leverages the deque's O(1) operations, making it efficient for stack implementations without additional overhead.

What happens if I pop from an empty deque with this library?

The deque panics when attempting to read or pop from an empty state, as mentioned in the README. To avoid this, always check Len() before operations or wrap calls in recover() for graceful error handling.

gammazero/deque vs Go slices for queue operations: which is better?

gammazero/deque is better for high-performance queues with frequent additions and removals at both ends due to its ring buffer reducing GC pauses. Go slices are simpler for basic, infrequent operations but may cause more allocations and slower performance in balanced workloads.

How does the ring buffer in deque improve performance over linked lists?

The ring buffer uses contiguous memory and bitwise arithmetic, minimizing allocations and GC pauses by reusing space as it wraps around. This leads to better CPU cache locality and faster O(1) operations compared to linked lists' pointer-chasing overhead.

Can I use gammazero/deque with custom struct types using Go generics?

Yes, the library supports Go generics, so you can declare a deque with any type, including custom structs. For example, use 'deque.Deque[MyStruct]' for type-safe operations without the need for interface{} or casting.

deque — Fast Go Ring-Buffer Deque

What is deque?

Deque is a Go library that provides a high-performance double-ended queue (deque) data structure using a ring buffer. It efficiently supports both queue (FIFO) and stack (LIFO) operations with constant-time performance, optimized for CPU and garbage collection efficiency.

Target Audience

Go developers who need a memory-efficient and fast deque implementation for scenarios like task scheduling, buffering, or algorithm implementations requiring O(1) operations at both ends.

Value Proposition

Developers choose this over alternatives because it uses a ring buffer that reduces allocations and GC pauses compared to slice or linked-list implementations, offers type safety via Go generics, and provides iterators for efficient traversal and removal.

Fast ring-buffer deque (double-ended queue)

Use Cases

Best For

Implementing high-performance queues (FIFO) with constant-time enqueue and dequeue operations.
Building stacks (LIFO) where fast push and pop operations at one end are critical.
Applications requiring memory efficiency and minimal garbage collection pauses, such as real-time systems or high-throughput data processing.
Scenarios where a double-ended queue is needed for algorithms like breadth-first search or sliding window problems.
Go projects using generics for type-safe data structures that integrate with stdlib packages like slices and iter.
Optimizing performance in balanced workloads where items frequently move in and out of the deque, leveraging the ring buffer's reuse of space.

Not Ideal For

Projects requiring out-of-the-box concurrent access without additional synchronization layers
Applications that prefer error returns or default values over panics for empty deque operations
Simple scripts or prototypes where Go's built-in slices suffice and deque complexity is unnecessary
Use cases needing lock-free data structures without external concurrency management

Pros & Cons

Pros

Ring-Buffer Efficiency

Uses a circular buffer that resizes by powers of two, reducing allocations and GC pauses compared to slice or linked-list implementations, as highlighted in the README for optimal performance.

Constant-Time Operations

Provides O(1) addition and removal at both ends, enabling high-throughput queue and stack operations suitable for real-time systems or algorithm implementations.

Type Safety with Generics

Leverages Go generics for compile-time type checks, allowing deques of any specified type and ensuring type-safe usage without runtime assertions.

Iterator Integration

Includes iterators for traversal and item removal, compatible with Go's stdlib slices and iter packages, facilitating efficient data processing and avoiding intermediate resizes.

Cons

Panic on Empty Read

Panics when reading from an empty deque, forcing explicit length checks and adding boilerplate, which can lead to runtime crashes if not carefully handled in production code.

No Built-in Concurrency Safety

Leaves concurrency safety entirely to the application, requiring external synchronization like mutexes, complicating code in multi-goroutine environments and increasing development overhead.

Configuration-Dependent Performance

Requires tuning of base capacity via SetBaseCap to minimize resizing; improper settings can lead to frequent reallocations, negating performance benefits in unbalanced workloads.

Frequently Asked Questions

What is deque?

Target Audience

Go developers who need a memory-efficient and fast deque implementation for scenarios like task scheduling, buffering, or algorithm implementations requiring O(1) operations at both ends.

Value Proposition

Use Cases

Best For

Implementing high-performance queues (FIFO) with constant-time enqueue and dequeue operations.
Building stacks (LIFO) where fast push and pop operations at one end are critical.
Applications requiring memory efficiency and minimal garbage collection pauses, such as real-time systems or high-throughput data processing.
Scenarios where a double-ended queue is needed for algorithms like breadth-first search or sliding window problems.
Go projects using generics for type-safe data structures that integrate with stdlib packages like slices and iter.
Optimizing performance in balanced workloads where items frequently move in and out of the deque, leveraging the ring buffer's reuse of space.

Not Ideal For

Projects requiring out-of-the-box concurrent access without additional synchronization layers
Applications that prefer error returns or default values over panics for empty deque operations
Simple scripts or prototypes where Go's built-in slices suffice and deque complexity is unnecessary
Use cases needing lock-free data structures without external concurrency management

Pros & Cons

Pros

Ring-Buffer Efficiency

Uses a circular buffer that resizes by powers of two, reducing allocations and GC pauses compared to slice or linked-list implementations, as highlighted in the README for optimal performance.

Constant-Time Operations

Provides O(1) addition and removal at both ends, enabling high-throughput queue and stack operations suitable for real-time systems or algorithm implementations.

Type Safety with Generics

Leverages Go generics for compile-time type checks, allowing deques of any specified type and ensuring type-safe usage without runtime assertions.

Iterator Integration

Includes iterators for traversal and item removal, compatible with Go's stdlib slices and iter packages, facilitating efficient data processing and avoiding intermediate resizes.

Cons

Panic on Empty Read

Panics when reading from an empty deque, forcing explicit length checks and adding boilerplate, which can lead to runtime crashes if not carefully handled in production code.

No Built-in Concurrency Safety

Leaves concurrency safety entirely to the application, requiring external synchronization like mutexes, complicating code in multi-goroutine environments and increasing development overhead.

Configuration-Dependent Performance

Requires tuning of base capacity via SetBaseCap to minimize resizing; improper settings can lead to frequent reallocations, negating performance benefits in unbalanced workloads.

Frequently Asked Questions

deque

What is deque?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

deque

What is deque?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?