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What techniques can be used to speed up C++ compilation times?
...rated binary sizes.
Changing visibility options
In newer compilers you can select your symbols to be either visible or invisible in the Dynamic Shared Objects (DSOs). Ideally, changing the visibility can improve compiler performance, link time optimizations (LTOs), and generated binary sizes. If yo...
What is the advantage to using bloom filters?
...riefly tell the basics.
you initiate an empty bit array of length m
you select k different hash functions (the more independent the better)
if you want to add element, you calculate all the k hashes of this value and set the corresponding bits to 1
if you want to check if element exist, you also ...
Fluid width with equally spaced DIVs
...g
.box1, .box2, .box3, .box4 { ...
to
#container > div { ...
This selects any div that is the first child of the #container div, and no others below it. To generalize the background colors, you can use the CSS3 nth-order selector, although it's only supported in IE9+ and other modern browse...
When to use Storyboard and when to use XIBs
...ryboards inherently still have flaws, I revise my advice from don't use to selectively use where it makes sense.
Even now that iOS 9 is out, I would advise against to use caution when deciding whether to use Storyboards. Here are my reasons:
Storyboards fail at runtime, not at compile time: You h...
How can I improve my paw detection?
... I'll give it a whack...
To detect individual paws, you should first only select everything with a pressure greater than some small threshold, very close to no pressure at all. Every pixel/point that is above this should be "marked." Then, every pixel adjacent to all "marked" pixels becomes marke...
Webfonts or Locally loaded fonts?
... I suppose if you're using a fairly popular font (may be cached) or only a select a handful of fonts, using webfonts is a great fairly quick font source. I'll post tests in speed here shortly.
– darcher
Mar 1 '14 at 21:04
...
Perforce for Git users? [closed]
...l of the files that are available on the server. A workspace view lets you select just the set that you care about. It's important to note that a workspace can map content from multiple depots, but can only map content from one server.
To compare Perforce to Git in this regard, with Git you pick an...
Should I use px or rem value units in my CSS? [closed]
...u have to press Alt, and go to View, Text Size.) It's much easier to just select the Zoom option in the browser's main menu (or use Ctrl++/-/mouse wheel).
1 - within statistical error, naturally
If we assume most users scale pages using the zoom option, I find relative units mostly irrelevant. I...
【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...层做得好不好，直接决定整个BLE芯片的功耗，灵敏度以及selectivity等射频指标。Link Layer，简称：LL，链路层。LL层是整个BLE协议栈的核心，也是BLE协议栈的难点和重点。像Nordic的BLE协议栈能同时支持20个link（连接），就是LL层的功...
Rails: FATAL - Peer authentication failed for user (PG::Error)
...o check the version of postgres if multiple versions are available
psql=# select VERSION();
PostgreSQL 9.1.13 on x86_64-unk.... # so version is 9.1
Now Open postgres user
vim /etc/postgresql/9.1/main/pg_hba.conf
9.1 is version return form upper command
and replace
local all ...