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What is an example of the Liskov Substitution Principle?
I have heard that the Liskov Substitution Principle (LSP) is a fundamental principle of object oriented design. What is it and what are some examples of its use?
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drag drop files into standard html file input
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The following works in Chrome and FF, but i've yet to find a solution that covers IE10+ as well:
// dragover and dragenter events need to have 'preventDefault' called
// in order for the 'drop' event to register.
// See: https://devel...
Set operations (union, intersection) on Swift array?
..."}
If you're using custom structs, you need to implement Hashable.
Thanks to Michael Stern in the comments for the Swift 2.0 update.
Thanks to Amjad Husseini in the comments for the Hashable info.
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Is there a Google Keep API? [closed]
Is there a API for Google Keep? I want to make a windows 8 app for Google Keep, so that it synchronizes with your phone.
3...
Response.Redirect with POST instead of Get?
We have the requirement to take a form submission and save some data, then redirect the user to a page offsite, but in redirecting, we need to "submit" a form with POST, not GET.
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In Python, how does one catch warnings as if they were exceptions?
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To quote from the python handbook (27.6.4. Testing Warnings):
import warnings
def fxn():
warnings.warn("deprecated", DeprecationWarning)
with warnings.catch_warnings(record=True) as w:
# Cause all warnings to always be triggered.
warnings.sim...
Exact difference between CharSequence and String in java [duplicate]
... actually does require a String.
Also note that maps should use String as key type, not CharSequence, as map keys must not change. In other words, sometimes the immutable nature of String is essential.
Specific code snippet
As for the code you pasted: simply compile that, and have a look at the J...
How to convert 2D float numpy array to 2D int numpy array?
...ay to int numpy array?
Tried using map directly to array but it did not work.
4 Answers
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Visual Studio 2010 always thinks project is out of date, but nothing has changed
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</system.diagnostics>
Restart Visual Studio
Open up DbgView and make sure it's capturing debug output
Try to debug (hit F5 in Visual Studio)
Search the debug log for any lines of the form:
devenv.exe Information: 0 : Project 'Bla\Bla\Dummy.vcxproj' not up to date because build input 'Bl...
PHP mail function doesn't complete sending of e-mail
... form itself is on my index.html page, but it submits to a separate "thank you for your submission" page, thankyou.php , where the above PHP code is embedded.
The code submits perfectly, but never sends an email. How can I fix this?
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