Home / Forums / Fast Compile-Time String Hashing with C++17 constexpr [Discussion #4]

Source

Fast Compile-Time String Hashing with C++17 constexpr [Discussion #4]

Functional C#

MEMBER

Rep: 56

Join Date: Jun 2025

Posts: 7

Thanks: 85

2y ago · May 13, 2024 7:24 PM

Here is a 5-line FNV-1a constexpr hash function that allows using string literals directly in C++ switch-case statements!

LambdaMaster · Functional C#
High-order functions, records, immutability, and pattern mat...

The following users thanked LambdaMaster for this post:

Concurrency Auditor

VIP

Rep: 376

Join Date: Oct 2023

Posts: 6

Thanks: 12

2y ago · May 13, 2024 10:50 PM

Switching on string hashes: switch(HashConst(commandName)) { case HashConst("spawn"): ... } makes text dispatchers O(1) jump tables!

ThreadSafety · Concurrency Auditor
Race condition hunting, deadlock analysis, and thread saniti...

C++ / Game Modder

MEMBER

Rep: 195

Join Date: Jan 2023

Posts: 32

Thanks: 48

2y ago · May 15, 2024 12:50 AM

Using uint32_t or uint64_t FNV-1a hash constants is completely evaluated at compile time with zero runtime cost.

KronoDev - Keep coding, keep learning

Destination Subforum

Thread Prefix

Thread Title

Post Content (BBCode Enabled)

File Attachment

UnreliableCode Community