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Why is the C++ STL is so heavily based on templates? (and not on *interfaces*)
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@einpoklum And what exactly would you gain from an abstract base class? Take std::set as an example. It does not inherit from an abstract base class. How does that limit your usage of std::set? Is there anything you cannot do with a std::se...
What does “where T : class, new()” mean?
Can you please explain to me what where T : class, new() means in the following line of code?
11 Answers
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what is the difference between GROUP BY and ORDER BY in sql
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What if the table has age column, with Peters having different ages and the query is SELECT NAME, AGE FROM TABLE GROUP BY NAME ?
– Varun
Oct 7 '15 at 5:00
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What is the difference between ~> and >= when specifying rubygem in Gemfile?
...rary value, but the ones preceding it in the string cannot be greater than what you provided. Thus for ~>0.8.5, any value is acceptable for the third digit (the 5) provided that it is greater than or equal to 5, but the leading 0.8 must be "0.8".
You might do this, for example, if you think that...
What strategies and tools are useful for finding memory leaks in .NET?
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I've accepted this as the answer because its what worked for me in the end, but I think all of the other answers are very useful. By the way, this tool is more commonly called SciTech's Mem Profiler!
– Scott Langham
Oct 9 '08 at 1...
C# 3.0 auto-properties — useful or not? [closed]
...ted in a discussion of Properties vs. Public Variables. IMHO that's really what this is a reaction to, and for that purpose, it's great.
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Shards and replicas in Elasticsearch
I am trying to understand what shard and replica is in Elasticsearch, but I didn't manage to understand it. If I download Elasticsearch and run the script, then from what I know I have started a cluster with a single node. Now this node (my PC) have 5 shards (?) and some replicas (?).
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SELECT INTO Variable in MySQL DECLARE causes syntax error?
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I ran into this same issue, but I think I know what's causing the confusion. If you use MySql Query Analyzer, you can do this just fine:
SELECT myvalue
INTO @myvar
FROM mytable
WHERE anothervalue = 1;
However, if you put that same query in MySql Workbench, it will t...
PHP cURL HTTP CODE return 0
... content, but the $httpcode always return 0, plus the curl_error is null . what could possible went wrong. I only include returntransfer, header (false), followlocation in the setting only.
– Ardeus
May 2 '12 at 12:08
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Database design for a survey [closed]
...create a survey where answers are stored in a database. I'm just wondering what would be the best way to implement this in the database, specifically the tables required. The survey contains different types of questions. For example: text fields for comments, multiple choice questions, and possibly ...