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Why doesn't Java allow generic subclasses of Throwable?
...tion, the compiler has no way to guarantee that MyException is only thrown from a scope that it is processing.
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Accessing JPEG EXIF rotation data in JavaScript on the client side
...oadend = function() {
// get EXIF data
var exif = EXIF.readFromBinaryFile(new BinaryFile(this.result));
// alert a value
alert(exif.Make);
};
fr.readAsBinaryString(file); // read the file
});
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Add up a column of numbers at the Unix shell
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... | paste -sd+ - | bc
is the shortest one I've found (from the UNIX Command Line blog).
Edit: added the - argument for portability, thanks @Dogbert and @Owen.
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Is the order of iterating through std::map known (and guaranteed by the standard)?
...d according to the keys. So, let's say the keys are integers. If I iterate from std::map::begin() to std::map::end() using a for , does the standard guarantee that I'll iterate consequently through the elements with keys, sorted in ascending order?
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How does a debugger work?
...ill enter an event loop much like for any UI, but instead of events coming from the windowing system, the OS will generate events based on what happens in the process being debugged – for example an exception occurring. See WaitForDebugEvent.
The debugger is able to read and write the target proc...
Generator Expressions vs. List Comprehension
... example, itertools.count(n) is an infinite sequence of integers, starting from n, so (2 ** item for item in itertools.count(n)) would be an infinite sequence of the powers of 2 starting at 2 ** n.
– Kevin
Jun 1 '15 at 1:48
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What are some uses of template template parameters?
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Here is a simple example taken from 'Modern C++ Design - Generic Programming and Design Patterns Applied' by Andrei Alexandrescu:
He uses a classes with template template parameters in order to implement the policy pattern:
// Library code
template <t...
How to move a file?
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After Python 3.4, you can also use pathlib's class Path to move file.
from pathlib import Path
Path("path/to/current/file.foo").rename("path/to/new/destination/for/file.foo")
https://docs.python.org/3.4/library/pathlib.html#pathlib.Path.rename
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Can promises have multiple arguments to onFulfilled?
...andard promise specification theres no clause preventing an implementation from handling this case - however its not implemented in the following libraries:
RSVP.promise (#L516-544)
Q promise (#787)
I assume the reason for them omiting multi arg resolves is to make changing order more succinct (...
Margin on child element moves parent element
...put 2 divs next to each other with margin: 5px 10px; id expect 2 divs 5 px from the top and 20px between them not 5 px from the top and 10px between them. if i wanted 10 px between them id have specified margin: 5px 5px;. i honestly wish there was a root rule i could place that would stop all margin...