---
layout: "default"
title: "_CVarArgPassedAsDouble"
description: "Swift documentation for '_CVarArgPassedAsDouble': Floating point types need to be passed differently on x86_64."
keywords: "_CVarArgPassedAsDouble,protocol,swift,documentation,encode"
root: "/v1.2"
---

<div class="intro-declaration"><code class="language-swift">protocol _CVarArgPassedAsDouble</code></div>

<div class="discussion comment">
    <p>Floating point types need to be passed differently on x86_64
systems.  CoreGraphics uses this t