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How do I test if a string is empty in Objective-C?
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Marc's answer is correct. But I'll take this opportunity to include a pointer to Wil Shipley's generalized isEmpty, which he shared on his blog:
static inline BOOL IsEmpty(id thing) {
return thing == nil
|| ([thing respondsToSelector:@selector(length)]
&& [(NSData *)thing len...
How do you search an amazon s3 bucket?
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CLI supports include/exclude. So, aws s3 ls s3://bucket --recursive --exclude '*' --include 'myfile*'
– Mohnish
Jun 25 at 5:01
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Validate that a string is a positive integer
...pression
Note that in both cases, I've interpreted "positive integer" to include 0, even though 0 is not positive. I include notes if you want to disallow 0.
Based on Parsing
If you want it to be a normalized decimal integer string over a reasonable range of values, you can do this:
function is...
Useless use of cat?
...omewhat unfortunately despite conscious consideration, none of the answers included my rationale.
I had not meant to be defensive in responding to him. After all, in my younger years, I would have written the command as grep foo file.txt | cut ... | cut ... because whenever you do the frequent sing...
How to get a time zone from a location using latitude and longitude coordinates?
...undary Builder - builds time zone shapefiles from OpenStreetMaps map data. Includes territorial waters near coastlines.
The following projects have previously been sources of time zone boundary data, but are no longer actively maintained.
tz_world - the original shapefile data from Eric Muller
whe...
Remove data.frame row names when using xtable
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Use include.rownames=FALSE in the print method.
See ?print.xtable:
R> print(xtable(res), include.rownames=FALSE)
% latex table generated in R 2.12.2 by xtable 1.5-6 package
% Fri Mar 25 10:06:08 2011
\begin{table}[ht]
\begin...
Logging levels - Logback - rule-of-thumb to assign log levels
...you don't typically want enabled even during normal development. Examples include dumping a full object hierarchy, logging some state during every iteration of a large loop, etc.
As or more important than choosing the right log levels is ensuring that the logs are meaningful and have the needed c...
Type erasure techniques
...in a function pointer, cast it and store in a functor of only one type:
#include <iostream>
#include <memory>
#include <functional>
using voidFun = void(*)(std::shared_ptr<void>);
template<typename T>
void fun(std::shared_ptr<T> t)
{
std::cout << *t ...
What is a difference between
...he IS-A relationship. Apple IS-A Fruit. Fruit (superclass) is a superset including Apple (subclass) as a subset. That verbal relationship is fine. What I'm saying breaks down is the notion that "upper" and "lower" have intrinsic mappings to "superset" and "subset". Upper and Lower should be avo...
How to get Android crash logs?
...ever directory adb is located in. Alternatively you can use the SDK tools included in the Eclipse plugin
– Chris Thompson
Jun 18 '13 at 23:05
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