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What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
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User-level applications use as integer registers for passing the
sequence %rdi, %rsi, %rdx, %rcx,
%r8 and %r9. The kernel interface uses %rdi, %rsi, %rdx, %r10, %r8 and %r9.
A system-call is done via the syscall instruction. This clobbers %rcx and %r11 as well as the %rax return v...
Generating v5 UUID. What is name and namespace?
...Name and namespace can be used to create a hierarchy of (very probably) unique UUIDs.
Roughly speaking, a type 3 or type 5 UUID is generated by hashing together a namespace identifier with a name. Type 3 UUIDs use MD5 and type 5 UUIDs use SHA1. Only 128-bits are available and 5 bits are used to spe...
How to “perfectly” override a dict?
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You can write an object that behaves like a dict quite easily with ABCs (Abstract Base Classes) from the collections.abc module. It even tells you if you missed a method, so below is the minimal version that shuts the ABC up.
from collections.abc import MutableMapping
c...
How can I sort arrays and data in PHP?
...ion takes two elements and must return 0 if these elements are considered equal, a value lower than 0 if the first value is lower and a value higher than 0 if the first value is higher. That's all that's needed:
function cmp(array $a, array $b) {
if ($a['foo'] < $b['foo']) {
return -1...
Monad in plain English? (For the OOP programmer with no FP background)
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UPDATE: This question was the subject of an immensely long blog series, which you can read at Monads — thanks for the great question!
In terms that an OOP programmer would understand (without any functional programming background), ...
Regular expression to match URLs in Java
...se at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License fo...
Fastest way to determine if an integer's square root is an integer
...m looking for the fastest way to determine if a long value is a perfect square (i.e. its square root is another integer):
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Objective-C categories in static library
...ches and experiments.
Problem was caused by (citation from apple Technical Q&A QA1490 https://developer.apple.com/library/content/qa/qa1490/_index.html):
Objective-C does not define linker
symbols for each function (or method,
in Objective-C) - instead, linker
symbols are only generated for eac...
Android studio: new project vs new module
... I would have thought these things would be left to the Module. If these questions are just so the appropriate support libs are added to the 'Project' then I understand, but I also see these same things when creating a new module. Quite confusing.
– Scott Naef
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Separate Back Stack for each tab in Android using Fragments
...your own back stacks for each tab.
To be honest, this seems like a really questionable thing to do. I can't imagine it resulting in a decent UI -- if the back key is going to do different things depending on the tab I am, especially if the back key also has its normal behavior of closing the entir...