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How do I show/hide a UIBarButtonItem?
...a toolbar in IB with several buttons. I would like to be able to hide/show one of the buttons depending on the state of the data in the main window.
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Difference between OData and REST web services
...'JSON Light' which addresses both of these concerns (which are really just one), i.e. $metadata is how you know to build queries, so all that was missing is a link to $metadata in resource representations. That has been added, so both problems disappear in one go.
– Alex James
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How can I create directories recursively? [duplicate]
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I would say this answer is the correct one for Python 2.x, since it handles errors correctly and doesn't asks for file system for path twice (as with os.path.exists approach).
– wonder.mice
Mar 19 '18 at 22:22
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console.log timestamps in Chrome?
...te.now() + '] ';
this.logCopy(timestamp, data);
};
To log more than one thing and in a nice way (like object tree representation):
console.logCopy = console.log.bind(console);
console.log = function()
{
if (arguments.length)
{
var timestamp = '[' + Date.now() + '] ';
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How can I import Swift code to Objective-C?
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@lelelo No, that file is the opposite of this one. The bridging header is written by the developer and lets you bring Objective-C and C symbols into your Swift code. The Target-Swift.h file is automatically generated and lets your Objective-C/C code access Swift symbols....
How can I remove a commit on GitHub? [duplicate]
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Everyone beware. See subutux's comment below. Even after force pushing to GitHub, GH still caches your commit. From help.github.com/articles/remove-sensitive-data : "Danger: Once the commit has been pushed you should consider the ...
Calculating Pearson correlation and significance in Python
...ataset be normally distributed. Like other correlation
coefficients, this one varies between -1 and +1 with 0 implying no
correlation. Correlations of -1 or +1 imply an exact linear
relationship. Positive correlations imply that as x increases, so does
y. Negative correlations imply that as x in...
Rails has_and_belongs_to_many migration
...eally depends on your queries. The indexes read left to right so the first one will be fastest if you are searching on restaurant_id. The second will help if you are searching on user_id. If you are searching on both, I would think the database would be smart enough to only need one. So I guess the ...
Should MySQL have its timezone set to UTC?
...f
https://serverfault.com/questions/191331/should-servers-have-their-timezone-set-to-gmt-utc
4 Answers
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Pointer arithmetic for void pointer in C
...6-2: For addition, either both
operands shall have arithmetic type,
or one operand shall be a pointer to
an object type and the other shall
have integer type.
So, the question here is whether void* is a pointer to an "object type", or equivalently, whether void is an "object type". The de...