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How to add multiple columns to a table in Postgres?
...
Try this :
ALTER TABLE table ADD COLUMN col1 int, ADD COLUMN col2 int;
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Does Swift have documentation generation support?
...yntax for rich playground comments & symbol documentation; these are pointed out in the document (e.g. block quotes can only be used in playgrounds).
Below is an example and a list of the syntax elements that currently work for symbol documentation comments.
Updates
Xcode 7 beta 4 ~ Added "...
How to increase the Java stack size?
... static void main(String[] args) {
try {
System.out.println(fact(1 << 15));
}
catch (StackOverflowError e) {
System.err.println("true recursion level was " + level);
System.err.println("reported recursion level was " +
...
Can gcc output C code after preprocessing?
...o have in mind:
gcc -save-temps -c -o main.o main.c
main.c
#define INC 1
int myfunc(int i) {
return i + INC;
}
and now, besides the normal output main.o, the current working directory also contains the following files:
main.i is the desired prepossessed file containing:
# 1 "main.c"
# 1 "<...
What is the logic behind the “using” keyword in C++?
...or type alias is identical to typedef.
7.1.3.2
A typedef-name can also be introduced by an alias-declaration. The
identifier following the using keyword becomes a typedef-name and the
optional attribute-specifier-seq following the identifier appertains
to that typedef-name. It has the same semantic...
When is a function too long? [closed]
... data, then writing it to disk then I'd split out the grabbing and writing into separate methods so my "main" method just contains the "doing something".
That "doing something" could still be quite a few lines though, so I'm not sure a number of lines is the right metric to be using :)
Edit: This ...
Android update activity UI from service
...erence to the Service, thus allowing direct calls on it, rather
than using Intents.
Use RxJava to execute asynchronous operations.
If the Service needs to continue background operations even when no
Activity is running, also start the service from the Application
class so that it does not get stoppe...
C++ auto keyword. Why is it magic?
...emplates. Consider a function template like this:
template<class T>
int whatever(T t) {
// point A
};
At point A, a type has been assigned to T based on the value passed for the parameter to whatever. When you do auto x = initializer;, the same type deduction is used to determine the t...
What's the difference between Task.Start/Wait and Async/Await?
...d is nothing more than what you're already used to: breaking up big tasks into little bits, queueing them up, and executing all the little bits in some order. Some of those executions cause other work to be queued up, and life goes on. One thread!
– Eric Lippert
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Readonly Properties in Objective-C?
I have declared a readonly property in my interface as such:
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