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How to empty/destroy a session in rails?
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To clear the whole thing use the reset_session method in a controller.
reset_session
Here's the documentation on this method: http://api.rubyonrails.org/classes/ActionController/Base.html#M000668
Resets the session by clearing out all
the objects stored ...
How is pattern matching in Scala implemented at the bytecode level?
...but see below about custom extractors
case "hello" // equality check
case _ : Foo // instance of check
case x => // assignment to a fresh variable
case _ => // do nothing, this is the tail else on the if/else
There's much more that you can do with patterns like or patterns and combinations ...
Which, if any, C++ compilers do tail-recursion optimization?
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gcc 4.3.2 completely inlines this function (crappy/trivial atoi() implementation) into main(). Optimization level is -O1. I notice if I play around with it (even changing it from static to extern, the tail recursion goes away pretty fast, so I wouldn't depend on it for...
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how to check redis instance version?
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redis-cli INFO SERVER | grep redis_version
– Andriy Tolstoy
Dec 23 '19 at 11:36
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Dual emission of constructor symbols
...rding to the ABI, the mangled name for your Thing::foo() is easily parsed:
_Z | N | 5Thing | 3foo | E | v
prefix | nested | `Thing` | `foo`| end nested | parameters: `void`
You can read the constructor names similarly, as below. Notice how the constructor "name" isn't given, but ...
How to stop C# console applications from closing automatically? [duplicate]
My console applications on Visual Studio are closing automatically, so I'd like to use something like C's system("PAUSE") to "pause" the applications at the end of its execution, how can I achieve that?
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How do you set a default value for a MySQL Datetime column?
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mysql> create table test (str varchar(32), ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
Query OK, 0 rows affected (0.00 sec)
mysql> desc test;
+-------+-------------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+...
Loading and parsing a JSON file with multiple JSON objects
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@Pi_: you'll have a dictionary, so just access the fields as keys: data = json.loads(line); print data[u'votes']
– Martijn Pieters♦
Sep 16 '12 at 23:26
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How do I create an Excel (.XLS and .XLSX) file in C# without installing Microsoft Office?
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If you are happy with the xlsx format, try my GitHub project, EPPlus. It started with the source from ExcelPackage, but today it's a total rewrite.
It supports ranges, cell styling, charts, shapes, pictures, named ranges, AutoFilter and ...