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### References

References are functions. They hold a reference to a value stored somewhere. For example, given:

    int i = 3;
    char const* s = "Hello World";

we create `references` to `i` and `s` this way:

    ref(i)
    ref(s)

Like `val`, the expressions above evaluates to a nullary function; the first one returning an `int&`, and the second one returning a `char const*&`.

(See references.cpp)

Learn more about references here.