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Nullable types and the ternary operator: why is `? 10 : null` forbidden? [duplicate]
...e two hence the error message.
If you change the right-hand expression to one of the following then it compiles because there is an implicit conversion between int? and null (#1) and between int and int? (#2, #3).
GetBoolValue() ? (int?)10 : null // #1
GetBoolValue() ? 10 : (int?)null // #2
...
A generic error occurred in GDI+, JPEG Image to MemoryStream
... be open at the time the object is saved. I am not sure why this is. Is anyone able to enlighten me and how I can get around this.
I only return from a stream because after using the resize code similar to this the destination file has an unknown mime type (img.RawFormat.Guid) and Id like the Mime...
Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?
...ow you specifically map them to debug logs in your code depends on the component or app you're working on, as well as how Android treats them on different build flavors (eng, userdebug, and user). I have done a fair amount of work in the native daemons in Android, and this is how I do it. It may n...
What command means “do nothing” in a conditional in Bash?
... difficult to read. Bash is a DevOps language, and if : is written by someone on my team, I'd have them change it.
– SaintHax
May 29 '17 at 19:51
3
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Generating random strings with T-SQL
...y it advanced the random seed. I updated the code, and also fixed the mentioned off-by-one issue.
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PHP validation/regex for URL
I've been looking for a simple regex for URLs, does anybody have one handy that works well? I didn't find one with the zend framework validation classes and have seen several implementations.
...
How do lexical closures work?
...environments for each of the functions created, with a different i in each one.
flist = []
for i in xrange(3):
def funcC(j):
def func(x): return x * j
return func
flist.append(funcC(i))
for f in flist:
print f(2)
This is what happens when you mix side effects and fun...
Usage of protocols as array types and function parameters in swift
...use Self or associatedtype keywords in their definitions (and Equatable is one of them).
In some cases it's possible to use a type-erased wrapper to make your collection homomorphic. Below is an example.
// This protocol doesn't provide polymorphism over the types which implement it.
protocol X: E...
Are global variables in PHP considered bad practice? If so, why?
...riables aren't really global in PHP. The scope of a typical PHP program is one HTTP request. Session variables actually have a wider scope than PHP "global" variables because they typically encompass many HTTP requests.
Often (always?) you can call member functions in methods like preg_replace_call...
Use String.split() with multiple delimiters
...
Try this regex "[-.]+". The + after treats consecutive delimiter chars as one. Remove plus if you do not want this.
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