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How do I create a unique constraint that also allows nulls?
...lause the DDL runs fine, but of course, doesn't do what I need it to. Any ideas?
– Kenneth Baltrinic
Jul 16 '10 at 18:07
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dynamic_cast and static_cast in C++
...();
else
animal = make_cat();
// At this point we have no idea what kind of animal we have
// so we use dyn_cast to see if it's a dog
if(dyn_cast(Animal::Dog, animal))
{
bark(animal); // we are sure the call is safe
}
delete animal;
}
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C# vs Java Enum (for those new to C#)
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Here's another interesting idea which caters for the custom behaviour available in Java. I came up with the following Enumeration base class:
public abstract class Enumeration<T>
where T : Enumeration<T>
{
protected static int ...
“Undefined reference to” template class constructor [duplicate]
I have no idea why this is happenning, since I think I have everything properly declared and defined.
3 Answers
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How do I automatically update a timestamp in PostgreSQL
...an)
Note that using reserved words for column names is usually not a good idea. You should find a different name than timestamp
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Alter column, add default constraint
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It seems like a really bad idea to use reserved words for column names.
– Norbert Norbertson
Sep 27 '17 at 12:44
4
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What's the difference between “Request Payload” vs “Form Data” as seen in Chrome dev tools Network t
...it is submitting as payload body. That’s all it can do because it has no idea where the data is coming from.
If you submit a HTML-Form with method="POST" and Content-Type: application/x-www-form-urlencoded or Content-Type: multipart/form-data your request may look like this:
POST /some-path HTTP...
What does the (unary) * operator do in this Ruby code?
...o look at the Splat method, since everything is exposed in Ruby. I have no idea where it is, but once you have that, you'll see that it runs a for through the array and builds the hash.
You would look for the code in the core documentation. If you cannot find it (I could not), you would try to wri...
Binary Data in JSON String. Something better than Base64
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Base91 is bad idea for JSON, because it contains quote in alphabet. In worst case (all quotes output) after the JSON encoding, it is 245% of the original payload.
– jarnoh
Sep 3 '13 at 6:05
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How do I get the resource id of an image if I know its name?
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Catching generic exceptions is an especially bad idea. Furthermore, note that if there are no hard references to the drawable, Proguard may optimize the reference away as it doesn't believe that it's being used anywhere.
– Paul Lammertsma
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