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Check if a class has a member function of a given signature
...raits>
// Primary template with a static assertion
// for a meaningful error message
// if it ever gets instantiated.
// We could leave it undefined if we didn't care.
template<typename, typename T>
struct has_serialize {
static_assert(
std::integral_constant<T, false>::...
Why is __init__() always called after __new__()?
...rned object of __new__ is checked for its class, the method would throw an error rather than allow the failed check to pass silently, because I do not understand why you'd ever want to return anything but an object of the class.
– soporific312
Apr 20 at 17:16
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How to change the session timeout in PHP?
...cted immediately but only whenever the session GC kicks in.
GC is a potentially expensive process, so typically the probability is rather small or even zero (a website getting huge numbers of hits will probably forgo probabilistic GC entirely and schedule it to happen in the background every X minut...
Saving a Numpy array as an image
... Remember to scale the values to the right range for PNG, usually 0..255. The value ranges in neural networks are frequently 0..1 or -1..1.
– Tomáš Gavenčiak
Mar 31 '18 at 18:49
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How to define “type disjunction” (union types)?
...4
scala> f("hello")
res1: Int = 5
scala> f(9.2)
<console>:9: error: Cannot prove that Int with String <:< Double.
f(9.2)
^
Source: Comment #27 under this excellent blog post by Miles Sabin which provides another way of encoding union types in Scala.
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How to put multiple statements in one line?
... but is there any other way that can accommodate for this type of checking/error-handling
– Rhys
May 29 '11 at 20:13
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How to use the TextWatcher class in Android?
...ich are overridden for the text watcher. you can mask the text which you really wanted to.
– Dinesh Prajapati
Dec 17 '11 at 8:07
2
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How to get parameters from a URL string?
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its working but i am getting error in logs like this : PHP Notice: Undefined index: query
– Srinivas08
Sep 11 '18 at 13:52
add a...
Import error: No module name urllib2
...n split across several modules in Python 3 named urllib.request and urllib.error. The 2to3 tool will automatically adapt imports when converting your sources to Python 3.
So you should instead be saying
from urllib.request import urlopen
html = urlopen("http://www.google.com/").read()
print(html)...
Why does “_” (underscore) match “-” (hyphen)?
...you are in a pattern context. e.g. inside a LIKE statement. When replacing all _ with an - : UPDATE sys_file set identifier = REPLACE(identifier, '_', '-') WHERE identifier LIKE '%\_%';. Notice the escaping inside LIKE and no escaping inside REPLACE. (I find it strange though that you are not in a p...