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# Architecture
_This document describes the high-level architecture of Metalang99._
## Interpreter
The interpreter interprets the core metalanguage described in the [specification].
[specification]: https://github.com/hirrolot/metalang99/blob/master/spec/spec.pdf
### `eval/eval.h`
`eval/eval.h` exposes a single macro `ML99_PRIV_EVAL` which evaluates a given metaprogram. It is implemented as a machine in [continuation-passing style] which is described in the specification too.
[continuation-passing style]: https://en.wikipedia.org/wiki/Continuation-passing_style
### `eval/rec.h`
`eval/rec.h` contains a macro recursion engine upon which everything executes.
## Standard library
The Metalang99 standard library is a set of functions implemented using the core metalanguage. They are located inside corresponding files listed at the [documentation]'s front page.
[documentation]: https://metalang99.readthedocs.io/en/latest/
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