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Is Meyers' implementation of the Singleton pattern thread safe?
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In C++11, it is thread safe. According to the standard, §6.7 [stmt.dcl] p4:
If control enters
the declaration concurrently while the variable is being initialized, the concurrent execution shall wait for completion of the initialization.
GCC and VS...
how to restart only certain processes using supervisorctl?
I'm running a few processes using supervisord, named process1, process2, ..., process8. If I want to restart process{1-4}, how can I do that with supervisorctl?
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Combating AngularJS executing controller twice
I understand AngularJS runs through some code twice, sometimes even more, like $watch events, constantly checking model states etc.
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How do you force a makefile to rebuild a target
...le that builds and then calls another makefile. Since this makefile calls more makefiles that does the work it doesnt really change. Thus it keeps thinking the project is built and upto date.
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Why do people put code like “throw 1; ” and “for(;;);” in front of json responses? [du
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Even without the for(;;); how would the attacker get the data?
Attacks are based on altering the behaviour of the built-in types, in particular Object and Array, by altering their constructor function or its prototype. Then when the targeted...
How to make a cross-module variable?
...ecause it affects every module. If I want to create another variable that works the same way, how would I do it?
12 Answers...
Catching “Maximum request length exceeded”
... in web.config (max size set to 5120). I'm using a simple <input> for the file.
14 Answers
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NULL vs nullptr (Why was it replaced?) [duplicate]
I know that in C++ 0x or NULL was replaced by nullptr in pointer-based applications. I'm just curious of the exact reason why they made this replacement?
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What is the python “with” statement designed for?
I came across the Python with statement for the first time today. I've been using Python lightly for several months and didn't even know of its existence! Given its somewhat obscure status, I thought it would be worth asking:
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Is mongodb running?
...ps -edaf | grep mongo | grep -v grep # "ps" flags may differ on your OS
or
/etc/init.d/mongodb status # for MongoDB version < 2.6
/etc/init.d/mongod status # for MongoDB version >= 2.6
or
service mongod status
to see if mongod is running (you need to be root to do...