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swift-method-apis.html
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<section>
<header>
<h1 class="j2-anchor">
<span>Swift Method APIs</span>
</h1>
</header>
<p>These types are used to implement Ruby methods in Swift.</p>
</section>
<div class="j2-swift j2-always">
<hr/>
<section>
<h1 class="sr-only">Topics</h1>
<section class="j2-swift j2-always">
<section id="rbmethodargsspec" class="j2-item j2-swift j2-always">
<a name="//apple_ref/cpp/Struct/struct%20RbMethodArgsSpec" class="dashAnchor j2-item-dash-anchor" data-item-id="rbmethodargsspec"></a>
<h4 class="sr-only">struct RbMethodArgsSpec</h4>
<a class="j2-item-title" href="#_rbmethodargsspec" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_rbmethodargsspec"><code>
<span class="j2-swift j2-always"><span class="j2-item-secondary">struct </span>RbMethodArgsSpec</span>
</code></a>
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<div class="clearfix">
<p>A description of how a Ruby method implemented in Swift is supposed to be called.</p>
<p>Ruby supports several different ways of passing arguments. A single method
can support a mixture of positional, keyword, and variable-length (splatted) arguments.</p>
<p>You supply one of these when defining a method so that RubyGateway knows how to decode
the arguments passed to it before your <a href="swift-method-apis.html?swift#rbmethodcallback"><code>RbMethodCallback</code></a> is invoked. The decoded
arguments are stored in the <code>args</code> property of the <a href="types/rbmethod.html?swift"><code>RbMethod</code></a> passed to your callback.</p>
<p>If you want to say “accept any number of arguments” then write
<code>RbMethodArgsSpec(supportsSplat: true)</code> and access the arguments via <code>method.args.splatted</code>.</p>
</div>
<h5>Declaration</h5>
<div class="j2-item-declaration">
<div class="j2-swift j2-always">
<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public struct RbMethodArgsSpec</code></pre>
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<section id="rbmethodcallback" class="j2-item j2-swift j2-always">
<a name="//apple_ref/cpp/Alias/typealias%20RbMethodCallback" class="dashAnchor j2-item-dash-anchor" data-item-id="rbmethodcallback"></a>
<h4 class="sr-only">typealias RbMethodCallback</h4>
<a class="j2-item-title" href="#_rbmethodcallback" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_rbmethodcallback"><code>
<span class="j2-swift j2-always"><span class="j2-item-secondary">typealias </span>RbMethodCallback</span>
</code></a>
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<p>The function signature for a Ruby method implemented as a Swift free function
or closure.</p>
<p>The <a href="types/rbobject13.html?swift"><code>RbObject</code></a> is the object the method is being invoked against.
The <a href="types/rbmethod.html?swift"><code>RbMethod</code></a> provides useful services such as argument access.</p>
<p>You can throw an <a href="types/rbexception.html?swift"><code>RbException</code></a> to raise a Ruby exception instead of returning
normally from the method. Throwing another type gets wrapped up in an
<a href="types/rbexception.html?swift"><code>RbException</code></a> and raised as a Ruby runtime exception.</p>
<p>See <a href="swift-method-apis.html?swift#rbboundmethodcallback"><code>RbBoundMethodCallback</code></a> and <a href="swift-method-apis.html?swift#rbboundmethodvoidcallback"><code>RbBoundMethodVoidCallback</code></a> for use with
custom Ruby classes that are bound to Swift types.</p>
</div>
<h5>Declaration</h5>
<div class="j2-item-declaration">
<div class="j2-swift j2-always">
<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public typealias RbMethodCallback = (<a href="types/rbobject13.html?swift">RbObject</a>, <a href="types/rbmethod.html?swift">RbMethod</a>) throws -> <a href="types/rbobject13.html?swift">RbObject</a></code></pre>
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<section id="rbboundmethodcallback" class="j2-item j2-swift j2-always">
<a name="//apple_ref/cpp/Alias/typealias%20RbBoundMethodCallback" class="dashAnchor j2-item-dash-anchor" data-item-id="rbboundmethodcallback"></a>
<h4 class="sr-only">typealias RbBoundMethodCallback</h4>
<a class="j2-item-title" href="#_rbboundmethodcallback" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_rbboundmethodcallback"><code>
<span class="j2-swift j2-always"><span class="j2-item-secondary">typealias </span>RbBoundMethodCallback</span>
</code></a>
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<p>The function signature for a Ruby method implemented as a Swift method of
a Swift bound object that returns a value.</p>
<p>These classes are defined with <a href="types/rbgateway1.html?swift#defineclass_underinitializer"><code>RbGateway.defineClass(_:under:initializer:)</code></a>
and methods on them defined with <a href="types/rbobject13.html?swift#definemethod_argsspecmethod1"><code>RbObject.defineMethod(_:argsSpec:method:)</code></a>.</p>
<p>This typealias describe methods on the type <code>SwiftPeer</code> that take a single
<a href="types/rbmethod.html?swift"><code>RbMethod</code></a> and return some type that can convert to <a href="types/rbobject13.html?swift"><code>RbObject</code></a>.
The <code>SwiftPeer</code> is the instance associated with the Ruby object; the <a href="types/rbmethod.html?swift"><code>RbMethod</code></a>
provides useful services such as argument access.</p>
<p>You can throw an <a href="types/rbexception.html?swift"><code>RbException</code></a> to raise a Ruby exception instead of returning
normally from the method. Throwing another type gets wrapped up in an
<a href="types/rbexception.html?swift"><code>RbException</code></a> and raised as a Ruby runtime exception.</p>
</div>
<h5>Declaration</h5>
<div class="j2-item-declaration">
<div class="j2-swift j2-always">
<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public typealias RbBoundMethodCallback<
SwiftPeer: <a href="https://developer.apple.com/documentation/swift/anyobject?language=swift">AnyObject</a>, Return: <a href="types/rbobjectconvertible.html?swift">RbObjectConvertible</a>
> =
(SwiftPeer) -> (<a href="types/rbmethod.html?swift">RbMethod</a>) throws -> Return</code></pre>
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</section>
<section id="rbboundmethodvoidcallback" class="j2-item j2-swift j2-always">
<a name="//apple_ref/cpp/Alias/typealias%20RbBoundMethodVoidCallback" class="dashAnchor j2-item-dash-anchor" data-item-id="rbboundmethodvoidcallback"></a>
<h4 class="sr-only">typealias RbBoundMethodVoidCallback</h4>
<a class="j2-item-title" href="#_rbboundmethodvoidcallback" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_rbboundmethodvoidcallback"><code>
<span class="j2-swift j2-always"><span class="j2-item-secondary">typealias </span>RbBoundMethodVoidCallback</span>
</code></a>
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<p>The function signature for a Ruby method implemented as a Swift method of
a Swift bound object that does not return a value.</p>
<p>These classes are defined with <a href="types/rbgateway1.html?swift#defineclass_underinitializer"><code>RbGateway.defineClass(_:under:initializer:)</code></a>
and methods on them defined with <a href="types/rbobject13.html?swift#definemethod_argsspecmethod1"><code>RbObject.defineMethod(_:argsSpec:method:)</code></a>.</p>
<p>This typealias describe methods on the type <code>SwiftPeer</code> that take a single
<a href="types/rbmethod.html?swift"><code>RbMethod</code></a>. The <code>SwiftPeer</code> is the instance associated with the Ruby object;
the <a href="types/rbmethod.html?swift"><code>RbMethod</code></a> provides useful services such as argument access.</p>
<p>You can throw an <a href="types/rbexception.html?swift"><code>RbException</code></a> to raise a Ruby exception instead of returning
normally from the method. Throwing another type gets wrapped up in an
<a href="types/rbexception.html?swift"><code>RbException</code></a> and raised as a Ruby runtime exception.</p>
</div>
<h5>Declaration</h5>
<div class="j2-item-declaration">
<div class="j2-swift j2-always">
<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public typealias RbBoundMethodVoidCallback<SwiftPeer: <a href="https://developer.apple.com/documentation/swift/anyobject?language=swift">AnyObject</a>> =
(SwiftPeer) -> (<a href="types/rbmethod.html?swift">RbMethod</a>) throws -> <a href="https://developer.apple.com/documentation/swift/void?language=swift">Void</a></code></pre>
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</section>
<section id="rbmethod" class="j2-item j2-swift j2-always">
<a name="//apple_ref/cpp/Struct/struct%20RbMethod" class="dashAnchor j2-item-dash-anchor" data-item-id="rbmethod"></a>
<h4 class="sr-only">struct RbMethod</h4>
<a class="j2-item-title" href="#_rbmethod" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_rbmethod"><code>
<span class="j2-swift j2-always"><span class="j2-item-secondary">struct </span>RbMethod</span>
</code></a>
<div class="collapse j2-item-popopen-wrapper" id="_rbmethod">
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<div class="j2-item-popopen-pointer" role="none"></div>
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<div class="clearfix">
<p>This offers useful services to Swift implementations of Ruby methods.</p>
<p>You do not create instances of this type: instead, RubyGateway creates
instances and passes them to method callbacks.</p>
</div>
<h5>Declaration</h5>
<div class="j2-item-declaration">
<div class="j2-swift j2-always">
<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public struct RbMethod</code></pre>
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