printf（_（“hello，world \\ n”））是什么意思？

Question

What's the role of the _("hello, world\\n") argument to printf/puts etc ? I often find it while reading GNU source code.

Answer 1

请参阅GNU Gettext - it（ _(...) ）用作翻译的“绑定站点”。

Answer 2

这是gettext国际化系统。

Answer 3

it is a macro that replaces the gettext translation function. For a thorough explanation on gettext, check out this write-up: http://oriya.sarovar.org/docs/gettext_single.html

Answer 4

The underscore function (or macro) is a custom function defined by whatever project you're looking at. By convention, it's defined to send the string to GNU Gettext to fetch a translated version of the string for the user's current language.

This use of the _ macro is documented in the overview found in the GNU Gettext manual.