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print call stack in C or C++
...oost_stacktrace.cpp:29 (discriminator 2)
3# __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
4# _start in ./boost_stacktrace.out
0# boost::stacktrace::basic_stacktrace<std::allocator<boost::stacktrace::frame> >::basic_stacktrace() at /usr/include/boost/stacktrace/stacktrace.hpp:1...
How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...aged by mysql were faulty (claimed to be universal but weren't). The data base adapter for Python, MySQLdb, has had its own issues. This is one case where you are well advised to just use MacPorts to build everything you need automatically. It's just too easy for something to go wrong.
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How are Python's Built In Dictionaries Implemented?
...49)
When adding entries to the table, we start with some slot, i, that is based on the hash of the key. CPython initially uses i = hash(key) & mask (where mask = PyDictMINSIZE - 1, but that's not really important). Just note that the initial slot, i, that is checked depends on the hash of the k...
How to decide font color in white or black depending on background color?
...e intensities. Each 2 digits of the code represent a value in hexadecimal (base-16) notation. I won't get into the details of the conversion here, they're easy to look up.
Once you have the intensities for the individual colors, you can determine the overall intensity of the color and choose the co...
How do you display JavaScript datetime in 12 hour AM/PM format?
... 1st and 3rd groups.
WARNING: toLocaleTimeString() may behave differently based on region / location.
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Do try/catch blocks hurt performance when exceptions are not thrown?
...r version), but it was no difference in the Release version.
Conclution:
Based on these test, I think we can say that Try/Catch does have a small impact on performance.
EDIT:
I tried to increase the loop value from 10000000 to 1000000000, and ran again in Release to get some differences in the re...
Hash String via SHA-256 in Java
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@Sajjad Use your favorite base64 encoding function. I like the one in Apache Commons personally.
– Brendan Long
Oct 22 '13 at 19:34
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Converting JavaScript object with numeric keys into array
...;
for (var prop in data) {
arr.push(data[prop]);
}
console.log(arr);
DEMO
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How to run a program without an operating system?
...n:
an x86 Lenovo Thinkpad T430 laptop with UEFI BIOS 1.16 firmware
an ARM-based Raspberry Pi 3
We will also try them out on the QEMU emulator as much as possible, as that is safer and more convenient for development. The QEMU tests have been on an Ubuntu 18.04 host with the pre-packaged QEMU 2.11....
Will the base class constructor be automatically called?
Would the age of customer be 2? It seems like the base class's constructor will be called no matter what. If so, why do we need to call base at the end sometimes?
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