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Is there a better way to insert the line number into a text string than using __LINE__?
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David Filmer
Mar 7, 2021, 3:00:37 AM3/7/21
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Hello everyone. I am often annoyed that this code:
#!/usr/bin/perl
print "Line [ ", __LINE__, " ] looks very nice\n";
print "Line [ __LINE__ ] is taken as a string-literal\n";
#print "Line [ @{[__LINE__}] is a syntax error\n";
produces this result:
Line [ 2 ] looks very nice.
Line [ __LINE__ ] is taken as a string-literal.
I would much prefer the syntax of Line 3, or some convenient token such as $LINE (or $__LINE__ or whatever I can just embed in double-quotes). Line 5 is still a lot of fanning-about, but it doesn't even compile.
The syntax of Line 2 works OK, but it is a lot of fanning-about that often makes me reluctant to include this useful bit of debugging information.
Is there a better way to include the __LINE__ information without all this fanning-about?
Thanks for reading.
- David
#!/usr/bin/perl
print "Line [ ", __LINE__, " ] looks very nice\n";
print "Line [ __LINE__ ] is taken as a string-literal\n";
#print "Line [ @{[__LINE__}] is a syntax error\n";
produces this result:
Line [ 2 ] looks very nice.
Line [ __LINE__ ] is taken as a string-literal.
I would much prefer the syntax of Line 3, or some convenient token such as $LINE (or $__LINE__ or whatever I can just embed in double-quotes). Line 5 is still a lot of fanning-about, but it doesn't even compile.
The syntax of Line 2 works OK, but it is a lot of fanning-about that often makes me reluctant to include this useful bit of debugging information.
Is there a better way to include the __LINE__ information without all this fanning-about?
Thanks for reading.
- David
Ben Bacarisse
Mar 7, 2021, 6:10:11 AM3/7/21
to
David Filmer <david...@gmail.com> writes:
> Hello everyone. I am often annoyed that this code:
>
> #!/usr/bin/perl
> print "Line [ ", __LINE__, " ] looks very nice\n";
> print "Line [ __LINE__ ] is taken as a string-literal\n";
> #print "Line [ @{[__LINE__}] is a syntax error\n";
>
> produces this result:
>
> Line [ 2 ] looks very nice.
> Line [ __LINE__ ] is taken as a string-literal.
>
> I would much prefer the syntax of Line 3, or some convenient token
> such as $LINE (or $__LINE__ or whatever I can just embed in
> double-quotes).
__LINE__ is not a Perl variable. It's just a special token replaced at
> Hello everyone. I am often annoyed that this code:
>
> #!/usr/bin/perl
> print "Line [ ", __LINE__, " ] looks very nice\n";
> print "Line [ __LINE__ ] is taken as a string-literal\n";
> #print "Line [ @{[__LINE__}] is a syntax error\n";
>
> produces this result:
>
> Line [ 2 ] looks very nice.
> Line [ __LINE__ ] is taken as a string-literal.
>
> I would much prefer the syntax of Line 3, or some convenient token
> such as $LINE (or $__LINE__ or whatever I can just embed in
> double-quotes).
compile time by the current source line number.
> Line 5 is still a lot of fanning-about, but it doesn't even compile.
That line has mismatched brackets, but it wouldn't work anyway because
__LINE__ is not a variable.
> The syntax of Line 2 works OK, but it is a lot of fanning-about that
> often makes me reluctant to include this useful bit of debugging
> information.
know of any alternative, so you'll have to decide it it's worth it.
--
Ben.
Athanasius
Mar 7, 2021, 6:33:31 AM3/7/21
to
21:29 >perl -wE "printf qq{Line [ %s ] looks nice too\n}, __LINE__;"
Line [ 1 ] looks nice too
21:30 >
Hope that helps,
--
Athanasius <°(((><
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