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Why would anyone use set instead of unordered_set?
C++0x is introducing unordered_set which is available in boost and many other places. What I understand is that unordered_set is hash table with O(1) lookup complexity. On the other hand, set is nothing but a tree with log(n) lookup complexity. Why on earth would anyone use set instead ...
How can you check for a #hash in a URL using JavaScript?
I have some jQuery/JavaScript code that I want to run only when there is a hash ( # ) anchor link in a URL. How can you check for this character using JavaScript? I need a simple catch-all test that would detect URLs like these:
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How to set auto increment primary key in PostgreSQL?
I have a table in PostgreSQL with 22 columns, and I want to add an auto increment primary key.
7 Answers
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What's the difference between django OneToOneField and ForeignKey?
What's the difference between Django OneToOneField and ForeignKey ?
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Recursive lambda functions in C++11
I am new to C++11. I am writing the following recursive lambda function, but it doesn't compile.
14 Answers
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How to trim a string to N chars in Javascript?
How can I, using Javascript, make a function that will trim string passed as argument, to a specified length, also passed as argument. For example:
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Any reason not to use '+' to concatenate two strings?
A common antipattern in Python is to concatenate a sequence of strings using + in a loop. This is bad because the Python interpreter has to create a new string object for each iteration, and it ends up taking quadratic time. (Recent versions of CPython can apparently optimize this in some cases, b...
How to override toString() properly in Java?
Sounds a little stupid, but I need help on my toString() method and it is very irking.
I tried looking up online because the toString is the one where it is screwing up and "not finding Kid constructor #2" even though it is there and I would even do something else and it doesn't work.
Ok that w...
Comet implementation for ASP.NET? [closed]
I've been looking at ways to implement gmail-like messaging inside a browser, and arrived at the Comet concept. However, I haven't been able to find a good .NET implementation that allows me to do this within IIS (our application is written in ASP.NET 2.0).
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PSQLException: current transaction is aborted, commands ignored until end of transaction block
I am seeing the following (truncated) stacktrace in the server.log file of JBoss 7.1.1 Final:
20 Answers
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