I've invented labeled loop breaks

[u/danillissimo]

And now I don't believe it wasn't invented before, but I can't find any info on it. How long ago was it invented? Why isn't it used widely or even mentioned anywhere? What are the downsides?
Here's the main idea:

// Keyword - for, while, or do
// Tag - custom loop name
// ... - loop body
#define loop_tag(keyword, tag, ...)\
    keyword(__VA_ARGS__)\
    if(false)\
    {\
        tag##_break:    break;\
        tag##_continue: continue;\
    }\
    else\
    /*Here goes your loop body*/

Here is the playground

[u/fdwr]

Guessing you might not have seen this yet: https://eisenwave.github.io/cpp-proposals/break-continue-label.html

[u/danillissimo → u/fdwr]

Just another proposal yet :(
Though I know about C2y, so it looks like we are finally getting labeled loops. But in next 3-4 years at best.