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Finding the type of an object in C++
... a bad_cast exception.
Make sure there is at least one virtual function in Base class to make dynamic_cast work.
Wikipedia topic Run-time type information
RTTI is available only for classes that are polymorphic, which means
they have at least one virtual method. In practice, this is not a
limitatio...
How can I tell if a DOM element is visible in the current viewport?
...iner inside body. For e.g it doesn't work here - agaase.github.io/webpages/demo/isonscreen2.html isElementInViewport(document.getElementById("innerele")). innerele is present inside a container which has scrolling enabled.
– agaase
Dec 8 '13 at 9:04
...
Get current domain
... | Joomla, Drupal/Symfony |
| The database | WordPress |
| An environmental variable | Laravel ...
How can I get nth element from a list?
... list), lists may in fact not be the proper data structure. For O(1) index-based access there are more efficient alternatives, such as arrays or vectors.
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Difference between private, public, and protected inheritance
... accessors that I'm aware of: public, protected and private.
Let:
class Base {
public:
int publicMember;
protected:
int protectedMember;
private:
int privateMember;
};
Everything that is aware of Base is also aware that Base contains publicMember.
Only the c...
git cherry-pick says “…38c74d is a merge but no -m option was given”
...m option. For example, git cherry-pick -m 1 fd9f578 to use parent 1 as the base.
I can't say for sure for your particular situation, but using git merge instead of git cherry-pick is generally advisable. When you cherry-pick a merge commit, it collapses all the changes made in the parent you didn't...
Does Swift support reflection?
...
Here is a class that will do reflection of base classes and optionals (not types) and has support for NSCoding and parsing from and to a dictionary: github.com/evermeer/EVCloudKitDao/blob/master/AppMessage/…
– Edwin Vermeer
Jan...
Restore the state of std::cout after manipulating it
...ude <iostream> or #include <ios> then when required:
std::ios_base::fmtflags f( cout.flags() );
//Your code here...
cout.flags( f );
You can put these at the beginning and end of your function, or check out this answer on how to use this with RAII.
...
How to make a valid Windows filename from an arbitrary string?
...
In case anyone wants an optimized version based on StringBuilder, use this. Includes rkagerer's trick as an option.
static char[] _invalids;
/// <summary>Replaces characters in <c>text</c> that are not allowed in
/// file names with the specified ...
How do I expire a PHP session after 30 minutes?
... and not the last access date:
Note: If you are using the default file-based session handler, your filesystem must keep track of access times (atime). Windows FAT does not so you will have to come up with another way to handle garbage collecting your session if you are stuck with a FAT filesyste...