在Ubuntu上进行Swift系统版本检查(Swift system version checking on Ubuntu)

在Ubuntu上进行Swift系统版本检查(Swift system version checking on Ubuntu)

我知道Swift有预处理器指令来检查操作系统：

#if os(iOS) ... #elseif os(OSX) ... #endif

但是，在网上搜索后，我发现没有什么可以检查操作系统是Ubuntu。 有没有办法做到这一点？ 我知道swift最近才开始研究Ubuntu，所以我意识到在撰写本文时可能没有办法。

I know Swift has preprocessor directives that check the OS :

#if os(iOS) ... #elseif os(OSX) ... #endif

But, after searching online, I've found nothing to check is the OS is Ubuntu. Is there a way of doing that ? I know swift has only recently been working on Ubuntu, so I realize that there may not be a way as of this writing.

最满意答案

在Swift中， #if ... #endif不是预处理程序语句，而是包含“条件编译块” 。 os()平台条件的有效参数（目前）记录为

macOS, iOS, watchOS, tvOS, Linux

因此#if os(Linux)检查Linux平台。 一个典型的例子是

#if os(Linux) import Glibc #else import Darwin #endif

在Linux和Apple平台上从C库导入函数。

In Swift, #if ... #endif are not preprocessor statements, but enclose a "Conditional Compilation Block". The valid arguments for the os() platform condition are (currently) documented as

macOS, iOS, watchOS, tvOS, Linux

Therefore #if os(Linux) checks for a Linux platform. A typical example is

#if os(Linux) import Glibc #else import Darwin #endif

to import functions from the C library on both Linux and Apple platforms.