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Why does PostgreSQL perform sequential scan on indexed column?
...current one- an index scan fetches one page at once. (A bitmap scan does a compromise between the two, you usually see that appearing in a plan for queries that aren't selective enough for an index scan, but still not so unselective as to merit a full table scan)
– araqnid
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How do I parse command line arguments in Bash?
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Method #1: Using bash without getopt[s]
Two common ways to pass key-value-pair arguments are:
Bash Space-Separated (e.g., --option argument) (without getopt[s])
Usage demo-space-separated.sh -e conf -s /etc -l /usr/lib /etc/hosts
cat >/tmp/demo-space-separated....
How to convert a string or integer to binary in Ruby?
...hose confused by @decay's code like myself, he is using 'sprintf': apidock.com/ruby/Kernel/sprintf
– Taylor Liss
Sep 4 '18 at 0:15
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Should I use static_cast or reinterpret_cast when casting a void* to whatever
...n that using reinterpret_cast would be a better match because it means “completely ignore type safety and just cast from A to B”.
However, this doesn’t actually describe the effect of a reinterpret_cast. Rather, reinterpret_cast has a number of meanings, for all of which holds that “the ma...
Providing a default value for an Optional in Swift?
...}
}
Then you can just do:
optionalValue.or(defaultValue)
However, I recommend sticking to the ternary operator as other developers will understand that much more quickly without having to investigate the or method
Note: I started a module to add common helpers like this or on Optional to swift...
Why can I not push_back a unique_ptr into a vector?
...t then one must take into account that the address of the local variable becomes invalid at the end of the scope.
– UncleBens
Jul 19 '10 at 18:39
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How can I get a list of build targets in Ant?
...argets without having to search through the file manually. Does ant have a command for this - something like ant show-targets - that will make it list all the targets in the build file?
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Contributing to project on github, how to “rebase my pull request on top of master”
...upstream , my forked repo on github is origin , and my local repo on my computer.
2 Answers
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What is the difference between javac and the Eclipse compiler?
Is Eclipse's Java compiler just a wrapper around the same core that the javac program is wrapped around, or is it a separate compiler altogether? If the latter, why would they reinvent the wheel?
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