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What is the 'instanceof' operator used for in Java?
...to compile
}
}
This fails to compile with the message:
Test.java:6: error: inconvertible types
System.out.println(t instanceof String);
^
required: String
found: Test
1 error
As Test is not a parent class of String. OTOH, this compiles perfectly and pr...
Python JSON serialize a Decimal object
...Flask Marshmallow ( for 'instant' serializer and deserializer), i had this error, every time i did a GET or POST. The serializer and deserializer, failed to convert Decimal types into any JSON identifiable format.
I did a "pip install simplejson", then
Just by adding
import simplejson as json
...
LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
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If you get a compiler error about type inference, check two things, (1) are the types the same, and (2) are the column names the same. The names part is a gotcha. This example won't compile even if all columns are varchars join T2 in db.tbl2 on ...
Understanding slice notation
...[:-2] and a only contains one element, you get an empty list instead of an error. Sometimes you would prefer the error, so you have to be aware that this may happen.
Relation to slice() object
The slicing operator [] is actually being used in the above code with a slice() object using the : notati...
How do I assert my exception message with JUnit Test annotation?
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@redDevil: The expectedMessage checks if the error message "contains" the string specified in this function (like a substring of the error message)
– tuan.dinh
Dec 28 '16 at 1:28
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What's so bad about Template Haskell?
...u can't typecheck TH to be that worrying. Why? Because even if there is an error, it will still be compile time. I'm not sure if this strengthens my argument, but this is similar in spirit to the errors that you receive when using templates in C++. I think these errors are more understandable than C...
What new capabilities do user-defined literals add to C++?
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The advantage is that a run-time exception is converted to a compile-time error.
You couldn't add the static assert to the bitset ctor taking a string (at least not without string template arguments).
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Make Vim show ALL white spaces as a character
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I tried this and got an error at first. It turned out that "space" was not a valid option in the slightly older version of gvim I was using. Upgrading my gvim solved my problem. For others that are getting an error, type :help listchars to check whe...
'Microsoft.SqlServer.Types' version 10 or higher could not be found on Azure
...blem (as types was already installed in my case). If anyone still gets the error after installing SQL Server Types, check this answer.
– Can Poyrazoğlu
Sep 23 '17 at 4:39
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SQL Server: Is it possible to insert into two tables at the same time?
...t however that it is not that simple in real life because of the following error
the OUTPUT INTO clause cannot be on
either side of a (primary key, foreign
key) relationship
I can still OUTPUT INTO a temp table and then finish with normal insert. So I can avoid my loop but I cannot avoid t...