Stupid C Tricks:
Here's a fun one. Check out this snippet:<code>#pragma once<br><br>__attribute__((transparent_union))<br>typedef union {<br> Widget widget_value;<br> DrawingArea drawing_area_value;<br> Label label_value;<br>} AnyWidget;<br></code>
See that attribute, "transparent_union"? That means a couple of things, but most importantly, it means that a function argument which is declared as that union type can take an argument value of any of the types in the union without casting; the local variable in the function will be of the union type.
mos_8502 :verified: /
npub1qn…5hzwk
2024-04-13 00:33:07
Author Public Key
npub1qnufz4pycufk27kkeev5g0fgm0w0tqexsly674s2uwy0tynk5ymsk5hzwkPublished at
2024-04-13 00:33:07Event JSON
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"content": "Stupid C Tricks:\n\nHere's a fun one. Check out this snippet:\u003ccode\u003e#pragma once\u003cbr\u003e\u003cbr\u003e__attribute__((transparent_union))\u003cbr\u003etypedef union {\u003cbr\u003e Widget widget_value;\u003cbr\u003e DrawingArea drawing_area_value;\u003cbr\u003e Label label_value;\u003cbr\u003e} AnyWidget;\u003cbr\u003e\u003c/code\u003e\n\nSee that attribute, \"transparent_union\"? That means a couple of things, but most importantly, it means that a function argument which is declared as that union type can take an argument value of any of the types in the union without casting; the local variable in the function will be of the union type.",
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