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Are HLists nothing more than a convoluted way of writing tuples?

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What is the meaning of “… …” token? i.e. double ellipsis operator on parameter pack

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【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

..._ioctl, .listen = sock_no_listen, .shutdown = inet_shutdown, .setsockopt = sock_common_setsockopt, .getsockopt = sock_common_getsockopt, .sendmsg = inet_sendmsg, .recvmsg = inet_recvmsg, .mmap = sock_no_mmap, .sendpage = inet_sendpage, .set_peek_off = s...
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How to get the parents of a merge commit in git?

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Creating an R dataframe row-by-row

I would like to construct a dataframe row-by-row in R. I've done some searching, and all I came up with is the suggestion to create an empty list, keep a list index scalar, then each time add to the list a single-row dataframe and advance the list index by one. Finally, do.call(rbind,) on the list...
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Hook up Raspberry Pi via Ethernet to laptop without router? [closed]

...install nmap Edit Wired connection on your laptop (Ubuntu) Change IpV4 settings to "Share to other computers" Save the setting Reboot your laptop Share WiFi connection of your laptop via Ethernet crossover cable Hook up your RPi with your laptop using the Ethernet cable Look up the broadca...
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How to urlencode data for curl command?

... esac encoded+="${o}" done echo "${encoded}" # You can either set a return variable (FASTER) REPLY="${encoded}" #+or echo the result (EASIER)... or both... :p } You can use it in two ways: easier: echo http://url/q?=$( rawurlencode "$args" ) faster: rawurlencode "$args"; echo ...
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Can a class member function template be virtual?

...re needed is only known when the caller is compiled, while the vtables are set up when the base class and derived classes are compiled. And these are all compiled separately. Even worse – new derived classes can be linked into running systems at runtime (think your browser loading a plugin dynamic...
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How can I convert a series of images to a PDF from the command line on linux? [closed]

...canning server I wrote in cgi/bash and want to be able to convert a bunch of images (all in one folder) to a pdf from the command line. How can that be done? ...
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In git, what is the difference between merge --squash and rebase?

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