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What are the rules for the “…” token in the context of variadic templates?
... template parameter pack if it appears on the right side of an expression (call this expression pattern for a moment), or it's a pack argument if it appears on left side of the name:
...thing // pack : appears as template arguments
thing... // unpack : appears when consuming the arguments
The r...
When should I use Write-Error vs. Throw? Terminating vs. non-terminating errors
...peline or a loop from continuing. Throw on the other hand produces what is called a terminating error. If you use throw, the pipeline and/or current loop will be terminated. In fact all execution will be terminated unless you use a trap or a try/catch structure to handle the terminating error.
Ther...
Datatable vs Dataset
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One feature of the DataSet is that if you can call multiple select statements in your stored procedures, the DataSet will have one DataTable for each.
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Visual Studio debugger - Displaying integer values in Hex
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I was able to do it in the Call Stack window in VS2010.
– StuperUser
Jan 19 '11 at 10:28
1
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Behaviour for significant change location API when terminated/suspended?
...uestion.
That is, your suspended app is woken up, you don't receive any callbacks on your app delegate, instead you receive your location updates through your existing CLLocationManagerDelegate. You can detect that you are running in the background by checking the applicationState, and do limite...
How to change letter spacing in a Textview?
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Since API 21 there is an option set letter spacing. You can call method setLetterSpacing or set it in XML with attribute letterSpacing.
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Capistrano - clean up old releases
...mmand fails to remove some files the task seems to silently "succeed" when called via the after hook. Calling it directly shows the errors... I realized this when I was starting to run out of disk space.
– conny
Jul 14 '10 at 10:48
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What is a 'SAM type' in Java?
...ingle abstract method", and "SAM-type" refers to interfaces like Runnable, Callable, etc. Lambda expressions, a new feature in Java 8, are considered a SAM type and can be freely converted to them.
For example, with an interface like this:
public interface Callable<T> {
public T call();
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Pass a data.frame column name to a function
...ol_name,col1,col2){
df$col_name <- df$col1 + df$col2
df
}
#Call foo() like this:
foo(dat,z,x,y)
The problem here is that df$col1 doesn't evaluate the expression col1. It simply looks for a column in df literally called col1. This behavior is described in ?Extract under the sect...
Understanding scala enumerations
...tation of Enumeration. This is not the assignment of a type! It is instead calling a protected method of the same name, Value, which returns a concrete instance of type Value.
It so happens that you can write val a, b, c = foo in Scala, and for each value a, b, and c the method foo will be called a...