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Which kind of pointer do I use when?
...nterparts. Use them when you need to share a resource and don't know which one will be the last to be alive. Use weak_ptr to observe the shared resource without influencing its lifetime, not to break cycles. Cycles with shared_ptr shouldn't normally happen - two resources can't own each other.
Note...
Clearing purchases from iOS in-app purchase sandbox for a test user
Does anyone have any ideas on how to reset and/or clear the iOS in-app purchase sandbox?
8 Answers
...
Finding the index of an item in a list
...e cleanest way to answer the question as asked, index is a rather weak component of the list API, and I can't remember the last time I used it in anger. It's been pointed out to me in the comments that because this answer is heavily referenced, it should be made more complete. Some caveats about lis...
How can I build XML in C#?
...
It depends on the scenario. XmlSerializer is certainly one way and has the advantage of mapping directly to an object model. In .NET 3.5, XDocument, etc. are also very friendly. If the size is very large, then XmlWriter is your friend.
For an XDocument example:
Console.WriteLin...
Retrieve the position (X,Y) of an HTML element relative to the browser window
...the viewport. If you need it relative to another element, simply subtract one rectangle from the other:
var bodyRect = document.body.getBoundingClientRect(),
elemRect = element.getBoundingClientRect(),
offset = elemRect.top - bodyRect.top;
alert('Element is ' + offset + ' vertical pixel...
How do I create a URL shortener?
...
As far as sanitizing the urls go, one of the problems you're going to face is spammers using your service to mask their URLS to avoid spam filters. You need to either limit the service to known good actors, or apply spam filtering to the long urls. Otherwise ...
Handling the window closing event with WPF / MVVM Light Toolkit
...indowClosing;
}
Then add the handler to the ViewModel:
using System.ComponentModel;
public void OnWindowClosing(object sender, CancelEventArgs e)
{
// Handle closing logic, set e.Cancel as needed
}
In this case, you gain exactly nothing except complexity by using a more elaborate pattern w...
Python Image Library fails with message “decoder JPEG not available” - PIL
...ll pillow
pip install --no-cache-dir -I pillow
If that doesn't work, try one of the below, depending on whether you are on 64bit or 32bit Ubuntu.
For Ubuntu x64:
sudo ln -s /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib
sudo ln -s /usr/lib/x86_64-linux-gnu/libfreetype.so /usr/lib
sudo ln -s /usr/...
Access nested dictionary items via a list of keys?
...
[keysInDict(v,parent+[k]) for k,v in dataDict.items()], [])
One use of it is to convert the nested tree to a pandas DataFrame, using the following code (assuming that all leafs in the nested dictionary have the same depth).
def dict_to_df(dataDict):
ret = []
for k in keysInDi...
How do I add spacing between columns in Bootstrap?
... the same issue; and the following worked well for me. Hope this helps someone landing here:
<div class="row">
<div class="col-md-6">
<div class="col-md-12">
Some Content..
</div>
</div>
<div class="col-md-6">
<div class="col-md-1...