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How to check if an email address exists without sending an email?
...= STACKOVERFLOW.COM.S9A1.PSMTP.com
stackoverflow.com MX preference = 20, mail exchanger = STACKOVERFLOW.COM.S9A2.PSMTP.com
stackoverflow.com MX preference = 30, mail exchanger = STACKOVERFLOW.COM.S9B1.PSMTP.com
C:\>telnet STACKOVERFLOW.COM.S9A1.PSMTP.com 25
220 Postini ESMTP 213 y6_3...
java: HashMap not working
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205
You can't use primitive types as generic arguments in Java. Use instead:
Map<String, Integ...
Vim Insert Mode on Mac OS X
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edited Nov 11 '14 at 20:08
answered Mar 17 '09 at 13:16
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What resources are shared between threads?
...tation, though.
– yyny
Sep 5 '19 at 20:27
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MySQL show current connection info
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Just a learnerJust a learner
20.2k4444 gold badges131131 silver badges192192 bronze badges
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What is the “-d” in “npm -d install”?
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Martijn Pieters♦
839k212212 gold badges32203220 silver badges28102810 bronze badges
answered Mar 3 '12 at 5:28
Mark KahnMark Kahn
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Nested or Inner Class in PHP
...ested classes with public/protected/private accessibility were proposed in 2013 for PHP 5.6 as an RFC but did not make it (No voting yet, no update since 2013 - as of 2016/12/29):
https://wiki.php.net/rfc/nested_classes
class foo {
public class bar {
}
}
At least, anonymous classes made i...
github markdown colspan
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edited Mar 20 '17 at 10:29
Community♦
111 silver badge
answered Aug 19 '14 at 18:08
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Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
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Nuno André
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answered Oct 9 '08 at 18:58
nathannathan
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Is there a standard sign function (signum, sgn) in C/C++?
...ed in the question.
– BartoszKP
Mar 20 '15 at 14:20
I have been wondering for the past few minutes why the standard li...