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How many GCC optimization levels are there?
... further optimizations
designed to reduce code size.
-Os disables the following optimization flags: -falign-functions -falign-jumps -falign-loops -falign-labels -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays -ftree-vect-loop-version)
There may also be platform specific opti...
How do I find where an exception was thrown in C++?
...and often is, located in a different function/method than the point of throwing. It has also been pointed out to me in the comments (thanks Dan) that it is implementation-defined whether or not the stack is unwound before terminate() is called.
Update: I threw together a Linux test program called t...
json_encode is returning NULL?
For some reason the item "description" returns NULL with the following code:
10 Answers
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Why unsigned integer is not available in PostgreSQL?
... The only problem with this approach is that you are "wasting" 15 bits of data storage which are unused. Not to mention the check also costs some small amount of efficiency. The better solution would be Postgres adding unsigned as a first class type. In a table with 20 million records, with...
How to extract the year from a Python datetime object?
....
One key thing to note is that the time components can differ between 32-bit and 64-bit pythons in some python versions (2.5.x tree I think). So you will find things like hour/min/sec on some 64-bit platforms, while you get hour/minute/second on 32-bit.
...
Where is Developer Command Prompt for VS2013?
...w:
Title: "VS2013 Native Tools-Command Prompt" would be good
Command: C:\Windows\System32\cmd.exe
Arguments: /k "C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools\VsDevCmd.bat"
Initial Directory: Select as suits your needs.
Click OK.
Now you have command prompt access under the...
How can I find the version of the Fedora I use?
... This is definitely the most convenient answer and also shows the bitness. Nice!
– Joshua Sleeper
Aug 24 '18 at 22:06
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Multiple glibc libraries on a single host
...ch program into RAM, and checks which linker is set for it. Usually, on 64-bit system, it is /lib64/ld-linux-x86-64.so.2 (in your filesystem it is symbolic link to the real executable).
Then linux runs the linker and it loads dynamic libraries.
You can also change this a little and do such trick:
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Iterator Loop vs index loop [duplicate]
I'm reviewing my knowledge on C++ and I've stumbled upon iterators. One thing I want to know is what makes them so special and I want to know why this:
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Selecting text in an element (akin to highlighting with your mouse)
... range.moveToElementText(node);
range.select();
} else if (window.getSelection) {
const selection = window.getSelection();
const range = document.createRange();
range.selectNodeContents(node);
selection.removeAllRanges();
selection.addRang...