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Why is a pure virtual function initialized by 0?
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The reason =0 is used is that Bjarne Stroustrup didn't think he could get another keyword, such as "pure" past the C++ community at the time the feature was being implemented. This is described in his book, The Design & Evolution of C++, section 13.2.3:
The curious =0 synta...
Is it possible to use AutoLayout with UITableView's tableHeaderView?
Since I discovered AutoLayout I use it everywhere, now I'm trying to use it with a tableHeaderView .
29 Answers
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Cannot add or update a child row: a foreign key constraint fails
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You're getting this error because you're trying to add/update a row to table2 that does not have a valid value for the UserID field based on the values currently stored in table1. If you post some more code I can help you diagnose the s...
Extract numbers from a string
I want to extract the numbers from a string that contains numbers and letters like:
20 Answers
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How to make phpstorm display line numbers by default?
How to make phpstorm display line numbers by default?
Couldn't find that option. It's kind of annoying to turn them on manually for each page.
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sendmail: how to configure sendmail on ubuntu? [closed]
When I searched for configuring sendmail on ubuntu I din't get any clear answer, each of them assume I know what they are talking about,
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Install a Python package into a different directory using pip?
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Use:
pip install --install-option="--prefix=$PREFIX_PATH" package_name
You might also want to use --ignore-installed to force all dependencies to be reinstalled using this new prefix. You can use --install-option to multiple times ...
.gitignore and “The following untracked working tree files would be overwritten by checkout”
... already been commited. .gitignore has no effect on files that are already in the repo so they need to be removed with git rm --cached. The --cached will prevent it from having any effect on your working copy and it will just mark as removed the next time you commit. After the files are removed from...
Iterate keys in a C++ map
...ur key-iterator with standard algorithms, so that they operate on the keys instead of the pairs), then take a look at Boost's transform_iterator.
[Tip: when looking at Boost documentation for a new class, read the "examples" at the end first. You then have a sporting chance of figuring out what on ...
Check whether or not the current thread is the main thread
Is there any way to check whether or not the current thread is the main thread in Objective-C?
13 Answers
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