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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.