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What is the type of lambda when deduced with “auto” in C++11?
... is no such thing as "a name the compiler decides upon". The result of type_info::name() is implementation-defined, so it may return anything. In practice, the compiler will name the type for the sake of the linker.
– avakar
Oct 31 '11 at 19:46
...
How to set an environment variable only for the duration of the script?
... for the duration of the script? For example, in a shell script, making an app that saves to HOME portable by temporarily setting HOME to a folder in the present working directory, and then launching the app.
...
How to remove from a map while iterating it?
...begin(); it != m.cend() /* not hoisted */; /* no increment */)
{
if (must_delete)
{
m.erase(it++); // or "it = m.erase(it)" since C++11
}
else
{
++it;
}
}
Note that we really want an ordinary for loop here, since we are modifying the container itself. The range-based loop sh...
What exactly are iterator, iterable, and iteration?
...and iterator have specific meanings.
An iterable is an object that has an __iter__ method which returns an iterator, or which defines a __getitem__ method that can take sequential indexes starting from zero (and raises an IndexError when the indexes are no longer valid). So an iterable is an object...
How can I change the color of AlertDialog title and the color of the line under it
...
I use this piece of code in many places in my app and everywhere it works fine. I only know about troubles with DialogFragment where title color hasn't id android:id/alertTitle but I didn't found the correct one.
– mmrmartin
Sep 11 ...
how to return index of a sorted list? [duplicate]
...ray([2,3,1,4,5])
>>> vals
array([2, 3, 1, 4, 5])
>>> sort_index = numpy.argsort(vals)
>>> sort_index
array([2, 0, 1, 3, 4])
If not available, taken from this question, this is the fastest method:
>>> vals = [2,3,1,4,5]
>>> sorted(range(len(vals)), key=...
How to run functions in parallel?
...starting'
for i in xrange(10000000): pass
print 'func2: finishing'
if __name__ == '__main__':
p1 = Process(target=func1)
p1.start()
p2 = Process(target=func2)
p2.start()
p1.join()
p2.join()
The mechanics of starting/joining child processes can easily be encapsulated into a functio...
Check that an email address is valid on iOS [duplicate]
...ing-an-e-mail-address/
NSString *stricterFilterString = @"^[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}$";
NSString *laxString = @"^.+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*$";
NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
NSPredicate *emailTest = [NS...
Git Symlinks in Windows
... on Windows
git config --global alias.add-symlink '!'"$(cat <<'ETX'
__git_add_symlink() {
if [ $# -ne 2 ] || [ "$1" = "-h" ]; then
printf '%b\n' \
'usage: git add-symlink <source_file_or_dir> <target_symlink>\n' \
'Create a symlink in a git repository on a Wi...
C library function to perform sort
... changed as per most suggestions. I draw the line, @ChrisL, at needing size_t since my arrays never get that big :-) And, @AndreyT, clever though that hack is, I prefer my code to be readable :-)
– paxdiablo
Nov 24 '09 at 11:44
...