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In which scenario do I use a particular STL container?
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@shuttle87 not just that size will never vary, but more importantly that size is determined at compile time and will never vary.
– YoungJohn
Jul 24 '15 at 20:51
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What is the maximum value for an int32?
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Is there a wikipedia API just for retrieve content summary?
...ck Exchange Network, created in 2008 by Jeff Atwood and Joel Spolsky, as a more open alternative to earlier Q&A sites such as Experts Exchange. The name for the website was chosen by voting in April 2008 by readers of Coding Horror, Atwood's popular programming blog.\nIt features questions and a...
What is a “cache-friendly” code?
...vector are stored in contiguous memory, and as such accessing them is much more cache-friendly than accessing elements in a std::list, which stores its content all over the place. This is due to spatial locality.
A very nice illustration of this is given by Bjarne Stroustrup in this youtube clip (th...
What is a “thread” (really)?
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+1. A thread isn't anything more "concrete" than a set of register values.
– Greg Hewgill
Mar 5 '11 at 5:24
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When is JavaScript's eval() not evil?
...il", as used by programming language people, usually means "dangerous", or more precisely "able to cause lots of harm with a simple-looking command". So, when is it OK to use something dangerous? When you know what the danger is, and when you're taking the appropriate precautions.
To the point, let...
How can we match a^n b^n with Java regex?
...lowly constructed. In this aspect, hopefully this answer will contain much more than just another neat regex pattern. Hopefully readers will also learn how to "think in regex", and how to put various constructs harmoniously together, so they can derive more patterns on their own in the future.
The l...
How to use the PI constant in C++
..._PI 3.14159265358979323846 /* pi */
but check your math.h for more. An extract from the "old" math.h (in 2009):
/* Define _USE_MATH_DEFINES before including math.h to expose these macro
* definitions for common math constants. These are placed under an #ifdef
* since these commonly-...
How do emulators work and how are they written? [closed]
... instructions but compile them to machine code on the fly -- this makes it more difficult to optimize, but that's out of the scope of this answer, unless enough people are interested)
With static recompilation, you do the same as in dynamic recompilation, but you follow branches. You end up buildin...
When and why are database joins expensive?
...ucing the cost of joins involving string comparisons. Not only will vastly more fit in cache, there's a lot less disk reading to do.
Moreover, a good optimiser will choose the most restrictive condition and apply it before it performs a join, very effectively leveraging the high selectivity of joi...