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Are there any downsides to passing structs by value in C, rather than passing a pointer?
...t this site is named after...
If I see an application that seems to have excessive stack usage, structs passed by value is one of the things I look for first.
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What does “Memory allocated at compile time” really mean?
...ere certain things will be allocated inside the process memory map.
For example, consider a global array:
int array[100];
The compiler knows at compile-time the size of the array and the size of an int, so it knows the entire size of the array at compile-time. Also a global variable has static ...
How to split the name string in mysql?
...ame will show as NULL if there is no middle name.
SELECT
SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 1), ' ', -1) AS first_name,
If( length(fullname) - length(replace(fullname, ' ', ''))>1,
SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 2), ' ', -1) ,NULL)
as middl...
When should you use constexpr capability in C++11?
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Suppose it does something a little more complicated.
constexpr int MeaningOfLife ( int a, int b ) { return a * b; }
const int meaningOfLife = MeaningOfLife( 6, 7 );
Now you have something that can be evaluated down to a constant while maintaining good readability and allowing sligh...
Parse config files, environment, and command-line arguments, to get a single collection of options
...think this is an advantage, because users will only have to learn one syntax.) Setting fromfile_prefix_chars to, for example, @, makes it so that,
my_prog --foo=bar
is equivalent to
my_prog @baz.conf
if @baz.conf is,
--foo
bar
You can even have your code look for foo.conf automatically by ...
Set operations (union, intersection) on Swift array?
...Set)// Intersection of two sets
firstSet.symmetricDifference(secondSet)// exclusiveOr
Swift 2.0 can calculate on array arguments:
set1.union(array2) // {"a", "b", "c", "d"}
set1.intersect(array2) // {"a", "b"}
set1.subtract(array2) // {"c"}
set1.exclusiveOr(array2) // {"c", "d"}
Swi...
How to show the last queries executed on MySQL?
Is there any query/way to show the last queries executed on ALL servers?
10 Answers
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How do I parse JSON with Ruby on Rails? [duplicate]
I'm looking for a simple way to parse JSON, extract a value and write it into a database in Rails.
12 Answers
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Android: alternate layout xml for landscape mode
...an I have one layout for landscape and one for portrait? I want to assume extra width and conserve vertical space when the user rotates the phone over sideways.
...
Django gives Bad Request (400) when DEBUG = False
...entation:
Values in this list can be fully qualified names (e.g. 'www.example.com'), in which case they will be matched against the request’s Host header exactly (case-insensitive, not including port). A value beginning with a period can be used as a subdomain wildcard: '.example.com' will mat...