RedisDB Notes (Discussions with chatGpt): For keydb hiredis vs redis-cpp vs redis plus plus

Query:
For keydb hiredis vs redis-cpp vs redis plus plus

ChatGPT said:

When choosing a C++ client library for KeyDB (a high-performance Redis fork), your choice among hiredis, redis-cpp, and redis-plus-plus depends on the specific needs of your application: performance, ease of use, features, async support, and memory usage.

Here's a detailed, performance and memory-oriented comparison:

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🔧 1. hiredis (C library)

URL: https://github.com/redis/hiredis
Type: Low-level C client for Redis.

✅ Pros:

• Very fast and lightweight: Minimal memory overhead.

• Synchronous and asynchronous support (libevent/libev/libuv).

• Low dependency footprint.

• Fully compatible with KeyDB's protocol.

❌ Cons:

• Very low-level: You handle serialization/deserialization manually.

• No C++ abstractions (you’ll write wrappers for convenience).

• Doesn't support STL containers or type safety.

• No connection pooling or modern C++ features.

🧠 Best for:

• High-performance systems where every byte and cycle counts.

• If you're okay managing Redis command formatting and parsing manually.

• TUI/daemon-style minimal systems.

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🌟 2. redis-plus-plus (C++11+ wrapper for hiredis)

URL: https://github.com/sewenew/redis-plus-plus
Type: Modern C++11+ client built on top of hiredis.

✅ Pros:

• Modern C++ API: STL support, iterators, smart pointers, RAII.

• Connection pooling, pub/sub, pipelines, transactions, async I/O.

• Easy to use, feature-rich, and widely adopted.

• Good balance between performance and convenience.

• Actively maintained.

❌ Cons:

• Slightly more memory and compile-time overhead than hiredis alone.

• Tied to hiredis backend (i.e., not pluggable).

• Limited control over internals for hardcore performance tuning.

🧠 Best for:

• High-performance systems that need maintainability.

• You want async/pipelining/pooling and modern C++ features.

• Easily integrates into trading engines or backend services.

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⚙️ 3. redis-cpp (C++20 standalone client)

URL: https://github.com/tdv/redis-cpp
Type: Header-only, standalone modern C++20 client.

✅ Pros:

• Header-only (easy to integrate).

• Uses Boost.Asio or standalone Asio (async-ready).

• Modern C++20 concepts (std::expected, coroutines, etc.).

• Clean, high-level API.

❌ Cons:

• C++20 only: GCC 10+ required.

• Smaller ecosystem; not as battle-tested as redis-plus-plus.

• Fewer resources/community support.

• Slightly more memory and CPU cost than hiredis-based clients.

🧠 Best for:

• Projects that are already using C++20 with coroutines.

• You prefer Boost.Asio-style async APIs.

• Future-proofing, but not yet optimal for tight memory/cpu bounds.

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⚖️ TL;DR Comparison Table

Feature	hiredis	redis-plus-plus	redis-cpp
Language	C	C++11	C++20
Async Support	Yes (low-level)	Yes (via hiredis)	Yes (via Asio)
Performance	🔥🔥🔥	🔥🔥	🔥🔥
Memory Usage	🔥🔥🔥	🔥🔥	🔥🔥
Ease of Use	❌	✅✅✅	✅✅
STL/RAII Friendly	❌	✅✅✅	✅✅✅
Connection Pooling	❌	✅	🚫 (manual)
Pub/Sub	Manual	Yes	Yes
C++ Standard Requirement	C99	C++11	C++20