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CSS media queries: max-width OR max-height
...a comma to specify two (or more) different rules:
@media screen and (max-width: 995px) , screen and (max-height: 700px) {
...
}
From https://developer.mozilla.org/en/CSS/Media_queries/
...In addition, you can combine multiple media queries in a comma-separated list; if any of the media quer...
Is gcc 4.8 or earlier buggy about regular expressions?
...eatures long before C++11 was finished and before many other compilers provided any support, and that feedback really helped improve C++11. This was a Good ThingTM.
The <regex> code was never in a useful state, but was added as a work-in-progress like many other bits of code at the time. It w...
Is a `=default` move constructor equivalent to a member-wise move constructor?
...copy/move
constructor is implicitly defined even if the implementation elided
its odr-use (3.2, 12.2). —end note ][...]
and paragraph 15 which says:
The implicitly-defined copy/move constructor for a non-union class X
performs a memberwise copy/move of its bases and members. [ Note:
...
std::function and std::bind: what are they, and when should they be used?
...a,b) := f(a, 4, b);
g is a "partial application" of the function f: the middle argument has already been specified, and there are two left to go.
You can use std::bind to get g:
auto g = bind(f, _1, 4, _2);
This is more concise than actually writing a functor class to do it.
There are further...
What Makes a Method Thread-safe? What are the rules?
Are there overall rules/guidelines for what makes a method thread-safe? I understand that there are probably a million one-off situations, but what about in general? Is it this simple?
...
When to use the brace-enclosed initializer?
...
I think the following could be a good guideline:
If the (single) value you are initializing with is intended to be the exact value of the object, use copy (=) initialization (because then in case of error, you'll never accidentally invoke an explicit constructor,...
Why always ./configure; make; make install; as 3 separate steps?
...ter to install certain libraries and files to certain directories. It is said to run ./configure, but in fact you should change it always.
For example have a look at the Arch Linux packages site. Here you'll see that any package uses a different configure parameter (assume they are using autotools...
Difference between Big-O and Little-O Notation
...d ≤ 1
not ≤ 0, < 0, or < 1
Here's a table, showing the general idea:
(Note: the table is a good guide but its limit definition should be in terms of the superior limit instead of the normal limit. For example, 3 + (n mod 2) oscillates between 3 and 4 forever. It's in O(1) despite not...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
...comparable efforts at optimizations; thus the speed differences can be considered as really intrinsic to the functions.
As a point of comparison, consider that a recent hard disk will run at about 100 MB/s, and anything over USB will top below 60 MB/s. Even though SHA-256 appears "slow" here, it is...
Can someone explain __all__ in Python?
...list of public objects of that module, as interpreted by import *. It overrides the default of hiding everything that begins with an underscore.
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