CartesianProduct

This library provides a product function that creates a lazy cartesian product.

For instance:

let sequence = product(["a", "b"], ["c", "d"])
sequence.forEach { tuple in
	print(tuple)
}

// prints
("a", "c")
("a", "d")
("b", "c")
("b", "d")

Note that in the example above, sequence is a CartesianProduct2Sequence<Array<String>, Array<String>> and not a Array<(String, String)>. Meaning that sequence has not computed all the values of the product of both arrays upfront.

You can pass up to 15 parameters to the product function (even if that may not be such a good idea).

Installing

Using Cocoapods:

Simply add the following line to your Podfile:

pod 'CartesianProduct'

Using Swift Package Manager:

To include CartesianProduct into a Swift Package Manager package, add it to the dependencies attribute defined in your Package.swift file.

dependencies: [
	.Package(url: "https://github.com/felginep/CartesianProduct.git", majorVersion: <majorVersion>, minor: <minor>)
]

Generated content

The CartesianProduct.swift file is generated with GYB.

You can download GYB like so:

wget https://github.com/apple/swift/raw/master/utils/gyb
wget https://github.com/apple/swift/raw/master/utils/gyb.py
chmod +x gyb

Then use make generate.

Running the tests

Run make test.

Authors

• Pierre Felgines Blog

License

This project is licensed under the MIT License - see the LICENSE file for details

Acknowledgments

• Joshua Emmons for his article Lazy Cartesian Products in Swift