Using Rust Macros for Custom VTables
Briefly

MiniJinja, a Rust implementation of Jinja2, enables the incorporation of dynamic elements into a language lacking a dynamic runtime, showcasing interesting behaviors and usage scenarios.
MiniJinja introduces a type called 'Value' for handling runtime types, incorporating reference counting to manage the memory usage of various data types like integers, strings, functions, and sequences.
The engine provides features allowing for template functionalities like rendering values, applying filters such as 'upper' or 'reverse' to strings or sequences, and providing boolean operations.
MiniJinja not only powers internal template behaviors but also exposes similar functionality through Rust APIs, enabling users to leverage its dynamic template capabilities in a statically typed language environment.
Read at Pocoo
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