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Applicatives compose, monads don't
...Note, by the way, that although composing monads is difficult, it might be more than you need. The type m (n v) indicates computing with m-effects, then computing with n-effects to a v-value, where the m-effects finish before the n-effects start (hence the need for swap). If you just want to interle...
Test if remote TCP port is open from a shell script
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As pointed by B. Rhodes, nc (netcat) will do the job. A more compact way to use it:
nc -z <host> <port>
That way nc will only check if the port is open, exiting with 0 on success, 1 on failure.
For a quick interactive check (with a 5 seconds timeout):
nc -z -v -w5 &lt...
How to Parse Command Line Arguments in C++? [duplicate]
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The documentation for boost::program_options could be more complete. It is specially difficult to find out how to use files to keep the options, a critical feature.
– gatopeich
Jun 16 '11 at 10:59
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Favorite way to create an new IEnumerable sequence from a single value?
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This method is more purely functional than creating a new array.
– Roy Tinker
Oct 4 '11 at 1:00
add a comment
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What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...rements for __STDC_ISO_10646__.
For platform specific code wchar_t may be more useful. It's essentially required on Windows (e.g., some files simply cannot be opened without using wchar_t filenames), though Windows is the only platform where this is true as far as I know (so maybe we can think of w...
Bash: Strip trailing linebreak from output
...ce a single line of output. I have, however, updated my answer to suit the more general case. HTH.
– Steve
Dec 12 '14 at 0:32
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When and why to 'return false' in JavaScript?
...nality. I believe returning false is deprecated and doesn't always work anymore.
– onetwopunch
Mar 24 '14 at 21:32
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Best way to do multiple constructors in PHP
...ee, in the end just doing what I already did in two methods. factories are more useful in situations where you can't easily define the exact constraints of a problem, like creating form elements. but then, that's just my opinion and for the record; I don't claim it to be fact.
–...
How do I reverse a C++ vector?
...swap(v1); which would effectively use your solution. I don't see how it is more elegant or advantageous in any way to using std::reverse though.
– CashCow
Jan 16 '12 at 10:45
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