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Functions that return a function
...ion is still callable. It still exists. This is used in JavaScript all the time. Functions can be passed around just like other values. Consider the following:
function counter() {
var count = 0;
return function() {
alert(count++);
}
}
var count = counter();
count();
count();
co...
How to display line numbers in 'less' (GNU)
...
wow, I have looked at the help for less dozens of times hoping to find the answer to this. I have always overlooked "-<flag> Toggle a command line option [see OPTIONS below]." ...which means you can type "-N" from within less. I have been annoyed by this for about a de...
Read logcat programmatically within application
...
I just discovered that clearing the log can take some time. So if you clear the log and then read the log immediate, some old entries may not yet been cleared. In addition, some newly added log entries can be deleted as because they get added before the clear completes. It do...
Use space as a delimiter with cut command
...All solutions above result in the exact same string (in each group) by the time cut sees them:
(s): cut sees -d, as its own argument, followed by a separate argument that contains a space char - without quotes or \ prefix!.
(d): cut sees -d plus a space char - without quotes or \ prefix! - as par...
Can C++ code be valid in both C++03 and C++11 but do different things?
...1) >>(2);
// fon<fun<4> >(2) in C++03
// Compile time error in C++11
unsigned int B = fon< fun< 9 >>(1) > >(2);
}
Operator new may now throw other exceptions than std::bad_alloc
struct foo { void *operator new(size_t x){ throw std::exception(); } }
tr...
Is optimisation level -O3 dangerous in g++?
...
In the early days of gcc (2.8 etc.) and in the times of egcs, and redhat 2.96 -O3 was quite buggy sometimes. But this is over a decade ago, and -O3 is not much different than other levels of optimizations (in buggyness).
It does however tend to reveal cases where people ...
How can I pass a list as a command-line argument with argparse?
...1234 -l 2345 -l 3456 -l 4567
With append you provide the option multiple times to build up the list.
Don't use type=list!!! - There is probably no situation where you would want to use type=list with argparse. Ever.
Let's take a look in more detail at some of the different ways one might try t...
How can I do test setup using the testing package in Go
.... It should then call
os.Exit with the result of m.Run
It took me some time to figure out that this means that if a test contains a function func TestMain(m *testing.M) then this function will be called instead of running the test. And in this function I can define how the tests will run. For ex...
Import PEM into Java Key Store
...r both. Either remove all extraneous data and feed in each PEM in one at a time or use my tool, as detailed in my answer.
– Alastair McCormack
Apr 15 '13 at 14:39
...
Default template arguments for function templates
... template arguments for function templates is a misbegotten remnant of the time where freestanding functions were treated as second class citizens and required all template arguments to be deduced from the function arguments rather than specified.
The restriction seriously cramps programming st...