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do { … } while (0) — what is it good for? [duplicate]
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#define FOO(x) foo(x); bar(x)
if (condition)
FOO(x);
else // syntax error here
...;
Even using braces doesn't help:
#define FOO(x) { foo(x); bar(x); }
Using this in an if statement would require that you omit the semicolon, which is counterintuitive:
if (condition)
FOO(x)
else
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remove None value from a list without removing the 0 value
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How to use Morgan logger?
...ilt to do logging in the way that servers like Apache and Nginx log to the error_log or access_log. For reference, this is how you use morgan:
var express = require('express'),
app = express(),
morgan = require('morgan'); // Require morgan before use
// You can set morgan ...
How can I get around MySQL Errcode 13 with SELECT INTO OUTFILE?
... $ mkdir bkptest
tmp $ mysqldump -u root -T bkptest bkptest
mysqldump: Got error: 1: Can't create/write to file '/Users/username/tmp/bkptest/people.txt' (Errcode: 13) when executing 'SELECT INTO OUTFILE'
tmp $ chmod a+rwx bkptest/
tmp $ mysqldump -u root -T bkptest bkptest
tmp $ ls bkptest/
people.s...
Subqueries vs joins
...a list.
– dacracot
Sep 26 '08 at 19:05
8
That depends - if the subquery is correlated somehow wit...
Practical usage of setjmp and longjmp in C
...can be used practically in embedded programming? I know that these are for error handling. But I'd like to know some use cases.
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Service Temporarily Unavailable Magento?
...yesterday. I started my PC today. When I tried to start Magento I got this error message.
13 Answers
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Can “git pull --all” update all my local branches?
...er using set -e instead of || exit 1 to make the interpreter exit on first error.
– crishoj
May 2 '18 at 11:32
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Get an object properties list in Objective-C
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+1 except this will error on primitives, such as int. Please see my answer below for slightly enhanced version of this same thing.
– jpswain
Dec 21 '11 at 18:02
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Cleanest way to write retry logic?
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+1, especially for the warning and error-checking. I'd be more comfortable if this passed in the type of the exception to catch as a generic parameter (where T: Exception), though.
– TrueWill
Oct 13 '09 at 22:55
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