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How to use the PI constant in C++
...e not part of the C/C++ standards.
*/
However:
on newer platforms (at least on my 64 bit Ubuntu 14.04) I do not need to define the _USE_MATH_DEFINES
On (recent) Linux platforms there are long double values too provided as a GNU Extension:
# define M_PIl 3.1415926535897932384626433832...
ansible: lineinfile for several lines?
...ok is run--it doesn't correctly recognize that the line already exists. At least, that's the case for me on Ansible 1.7.1
– David
Oct 7 '14 at 14:13
calling non-static method in static method in Java [duplicate]
...ng instance. This way you'll be invoking the method on an instance, but at least you won't be creating new instances each time you need to call the method.
Implement 2 methods in your class: an instance method (as defined in xInterface), and a static method. The instance method will consist of a sin...
Undefined method 'task' using Rake 0.9.0
...
I think this is the least "hacky" solution. You might need to run rake as bundle exec rake to use the working bundled version.
– Stuart K
May 21 '11 at 17:01
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What is a database transaction?
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In addition to the above responses, it should be noted that there is, at least in theory, no restriction whatsoever as to what kind of resources are involved in a transaction.
Most of the time, it is just a database, or multiple distinct databases, but it is also conceivable that a printer takes ...
Read first N lines of a file in python
... slightly faster. But the first one won't work if the file doesn't have at least N lines. You are best to measure the performance against some typical data you will be using it with.
– John La Rooy
Nov 20 '09 at 0:47
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XML serialization in Java? [closed]
... and java.beans.XMLDecoder. These classes perform XML encoding which is at least very comparable to XML Serialization and in some circumstances might do the trick for you.
If your class sticks to the JavaBeans specification for its getters and setters, this method is straightforward to use and you...
python exception message capturing
...u get e.errno, e.filename, and e.strerror, but apparently no e.message (at least in Python 2.7.12). If you want to capture the error message, use str(e), as in the other answers.
– epalm
Apr 19 '17 at 18:28
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How to add a downloaded .box file to Vagrant?
...works with a nun URI path to, so the scheme file:// can be omitted here at least. Maybe that a version specific change or its windows specific, i rather expect the latter one
– Eugen Mayer
Nov 11 '18 at 13:14
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How to comment and uncomment blocks of code in the Office VBA Editor
...oxious that it doesn't work if you choose any other display option, but at least on my screen I prefer to save a little space with "Text Only."
– Air
Jun 6 '16 at 18:30
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