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Example code of upscale/stdlib-overloading

Informations about the package stdlib-overloading

Function Overloading Build Status

This library introduces function/method overloading – varying implementation depending on input arguments.

Features:

Installation

The library is to be installed via Composer as a dependency:

Usage

Syntax

Overload a custom function/method:

Any number of valid callable implementations can be declared. Order defines evaluation priority.

Call the overloaded function:

Example

Arithmetic calculator that works with ordinary integers, arbitrary-length GMP integers, and Money objects.

Architecture

The overloading mechanism leverages the native type system of PHP7 and relies on declaration of strict type annotations. It traverses implementation callbacks in the declared order and attempts to invoke each of them with provided arguments. Result of the first compatible invocation is returned and the subsequent callbacks discarded.

Limitations

PHP engine allows to pass more runtime arguments to a function/method than accounted for in its signature declaration. Excess arguments are being silently discarded without triggering any catchable errors, not even ArgumentCountError. The solution is to declare more specific longer signatures before less specific ones with matching subset of arguments.

Optional arguments are problematic as they are call-time compatible with a shorter signature of required arguments only. Consider the following ambiguous declaration that cannot be resolved by reordering:

The workaround is to validate the number of arguments to not exceed the declaration:

Contributing

Pull Requests with fixes and improvements are welcome!

License

Copyright © Upscale Software. All rights reserved.

Licensed under the Apache License, Version 2.0.

All versions of stdlib-overloading with dependencies

PHP Build Version
Package Version
Requires php Version >=7.1
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