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How does the main() method work in C?
...d nothing bad happens with their given compiler.
This is the case if the calling conventions are such that:
The calling function cleans up the arguments.
The leftmost arguments are closer to the top of the stack, or to the base of the stack frame, so that spurious arguments do not invalidate the ...
Get underlying NSData from UIImage
...a pixel array or some other internal format. In other words, UIImage(data: foo) will not retain foo.
If you just want to use it elsewhere in your program, the original UIImage will do fine (I presume that's not actually the case here)
If you want to serialise, UIImagePNGRepresentation(...) will wo...
How to create a custom string representation for a class object?
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@RobertSiemer Why? While his answer is not specifically targeting the OP's question, it's still helpful. It helped me. And at a glance, I don't see any question asking for instance implementation. So probably people land on this page first.
– akinuri
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Express-js wildcard routing to cover everything under and including a path
...wser (or curl):
const app = require('express')()
// will be able to match all of the following
const test1 = 'http://localhost:3000/hello/world'
const test2 = 'http://localhost:3000/hello/world/'
const test3 = 'http://localhost:3000/hello/world/with/more/stuff'
// but fail at this one
const failTe...
git ignore exception
...have a gitignore file that makes git ignore *.dll files, and that is actually the behavior I want. However, if I want an exception ( i.e. to be able to commit foo.dll ), how can I achieve this?
...
Ruby regular expression using variable name
...aracters. If it does and you want those matacharacters to do what they usually do in a regular expression, then the same gsub will work:
var = "Value|a|test"
str = "a test Value"
str.gsub( /#{var}/, 'foo' ) # => "foo foo foo"
However, if your search string contains metacharacters and you do n...
When NOT to use yield (return) [duplicate]
...is h deep. Then there will at most points be O(h) nested iterators built. Calling "MoveNext" on the outer iterator will then make O(h) nested calls to MoveNext. Since it does this O(n) times for a tree with n items, that makes the algorithm O(hn). And since the height of a binary tree is lg n <=...
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...ON DUPLICATE KEY UPDATE.
If you use INSERT IGNORE, then the row won't actually be inserted if it results in a duplicate key. But the statement won't generate an error. It generates a warning instead. These cases include:
Inserting a duplicate key in columns with PRIMARY KEY or UNIQUE constrain...
Custom HTTP headers : naming conventions
... other words, you can keep using "X-" prefixed headers, but it's not officially recommended anymore and you may definitely not document them as if they are public standard.
Summary:
the official recommendation is to just name them sensibly without the "X-" prefix
you can keep using "X-" prefixe...
Uniq by object attribute in Ruby
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Do it on the database level:
YourModel.find(:all, :group => "status")
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