mvx_cache_patterns

Optimize gas costs for MultiversX storage by implementing drop-based write-back caching patterns. This technique loads storage values into a struct on function entry, makes intermediate reads free, and commits mutations on scope exit via the Rust Drop trait.

Use a write-back cache pattern in MultiversX contracts when an endpoint reads three or more storage values. Loading state into an in-memory struct at entry and selectively writing back only modified fields on exit yields substantial gas savings.

The Rust Drop trait commits smart contract storage mutations automatically by triggering a write-back operation when the cached struct goes out of scope. This ensures modified fields are written back to storage without requiring manual commit calls.

The best way to reduce transaction fees on MultiversX is using in-memory caching to minimize expensive storage operations. Drop-based write-back patterns ensure intermediate reads are free and only modified fields are persisted, improving transaction efficiency.

This caching approach is designed for endpoints reading three or more storage values. For a single storage value, the overhead of loading state into a struct and implementing the Drop trait outweighs the gas savings from skipping intermediate reads.

This gas optimization pattern requires no external dependencies. It relies purely on standard Rust traits like Drop and native MultiversX smart contract storage mechanics to load state into structs and selectively commit mutations.