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How to check the version before installing a package using apt-get?
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How to initialize const member variable in a class?
... file is typically included into many translation units. However, to avoid complicated linker rules, C++ requires that every object has a unique definition. That rule would be broken if C++ allowed in-class definition of entities that needed to be stored in memory as objects.
A const variable has ...
Scala: Abstract types vs generics
...ed abstraction. So in a sense you could say Scala is a more orthogonal and complete language.
Why?
What, in particular, abstract types buy you is a nice treatment for these covariance problems we talked about before.
One standard problem, which has been around for a long time, is the problem of an...
Create unique constraint with null columns
...er_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) where menu_id IS NULL, effectively implementing the desired constraint.
Possible drawbacks: you cannot have a foreign key referencing (user_id, menu_id, recipe_id), you cannot base CLUSTER...
How to prevent blank xmlns attributes in output from .NET's XmlDocument?
...ised. If you need refreshing on how namespaces work, have a look at jclark.com/xml/xmlns.htm
– JeniT
Sep 26 '08 at 8:25
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Store pictures as files or in the database for a web app?
... Server 2008. There was a new type introduced FILESTREAM technet.microsoft.com/en-us/library/bb895234.aspx which allowes to take advantage of "performance of the file system and at the same time maintain transactional consistency between the unstructured data and corresponding structured data"
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Selectors in Objective-C?
...t, you have to add the extra argument names along with their colons, as in compare:options:range:locale:.
You can also look at the documentation and note the presence or absence of a trailing colon.
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In Bash, how to add “Are you sure [Y/n]” to any command or alias?
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These are more compact and versatile forms of Hamish's answer. They handle any mixture of upper and lower case letters:
read -r -p "Are you sure? [y/N] " response
case "$response" in
[yY][eE][sS]|[yY])
do_something
;;
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Leaflet - How to find existing markers, and delete markers?
...ave started using leaflet as an open source map, http://leaflet.cloudmade.com/
9 Answers
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