# library

A static library + an executable that consumes it.

```sh
cd examples/library
crafter-build
./bin/math-app-x86_64-pc-linux-gnu-native/math-app
```

Layout:

```
mylib/MyMath.cppm     # the library's module interface
main.cpp              # the consumer
project.cpp           # declares both, with cfg.dependencies wiring them
```

Two `Configuration` objects: a `LibraryStatic` and an `Executable` whose `dependencies` points at the lib. The build runs them in parallel and links `libMyMath.a` into `math-app` automatically. `import MyMath;` in `main.cpp` resolves through the dep graph — no header paths to hand-wire.

The `static unique_ptr<Configuration>` for the lib is the canonical lifetime pattern: the parent's `dependencies` is `vector<Configuration*>` (raw), so something needs to keep the lib alive across the function return. File-local `static` does it cleanly without a global pool.