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Date: Tue, 3 Jun 2014 21:12:20 -0700 (PDT)
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Subject: Re: a new language, designed for safety !
From: "Dan'l Miller" <optikos@verizon.net>
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Xref: news.eternal-september.org comp.lang.ada:20129
Date: 2014-06-03T21:12:20-07:00
List-Id: <comp.lang.ada>

On Tuesday, June 3, 2014 8:19:03 PM UTC-5, Dan'l Miller wrote:
> On Tuesday, June 3, 2014 7:21:45 PM UTC-5, Luke A. Guest wrote:
>=20
> > Quel surprise, it's YAC (yet another C)

This YAC is not your father's Oldsmobile.  As another example, Swift (along=
 with Seed7, Fortress, and a few other languages lately) allow declaration =
of prefix, infix, & postfix operators that do not appear in the standardize=
d language:

"Custom Operators
You can declare and implement your own custom operators in addition to the =
standard operators provided by Swift. Custom operators can be defined only =
with the characters / =3D - + * % < > ! & | ^ . ~.

New operators are declared at a global level using the operator keyword, an=
d can be declared as prefix, infix or postfix:

operator prefix +++ {}
The example above defines a new prefix operator called +++. This operator d=
oes not have an existing meaning in Swift, and so it is given its own custo=
m meaning below in the specific context of working with Vector2D instances.=
 For the purposes of this example, +++ is treated as a new "prefix doubling=
 incrementer" operator. It doubles the x and y values of a Vector2D instanc=
e, by adding the vector to itself with the addition assignment operator def=
ined earlier:

@prefix @assignment func +++ (inout vector: Vector2D) -> Vector2D {
    vector +=3D vector
    return vector
}
This implementation of +++ is very similar to the implementation of ++ for =
Vector2D, except that this operator function adds the vector to itself, rat=
her than adding Vector2D(1.0, 1.0):

var toBeDoubled =3D Vector2D(x: 1.0, y: 4.0)
let afterDoubling =3D +++toBeDoubled
// toBeDoubled now has values of (2.0, 8.0)
// afterDoubling also has values of (2.0, 8.0)

Precedence and Associativity for Custom Infix Operators[...]"

Excerpt From: Apple Inc. "The Swift Programming Language." iBooks. https://=
itun.es/us/jEUH0.l