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Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)
...ing a mutex:
// A class with implements RAII
class lock
{
mutex &m_;
public:
lock(mutex &m)
: m_(m)
{
m.acquire();
}
~lock()
{
m_.release();
}
};
// A class which uses 'mutex' and 'lock' objects
class foo
{
mutex mutex_; // mutex for l...
What is C# analog of C++ std::pair?
...ect
Here is my pair class
public class Pair<X, Y>
{
private X _x;
private Y _y;
public Pair(X first, Y second)
{
_x = first;
_y = second;
}
public X first { get { return _x; } }
public Y second { get { return _y; } }
public override bool E...
MySQL get the date n days ago as a timestamp
...
DATE_SUB will do part of it depending on what you want
mysql> SELECT DATE_SUB(NOW(), INTERVAL 30 day);
2009-06-07 21:55:09
mysql> SELECT TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day));
2009-06-07 21:55:09
mysql> SELECT U...
How to identify server IP address in PHP
...
Like this for the server ip:
$_SERVER['SERVER_ADDR'];
and this for the port
$_SERVER['SERVER_PORT'];
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What's the deal with a leading underscore in PHP class methods?
...private with an underscore. In some older classes you'll see /**private*/ __foo() { to give it some extra weight.
I've never heard of developers prefacing all their methods with underscores, so I can't begin to explain what causes that.
...
Pandas convert dataframe to array of tuples
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How about:
subset = data_set[['data_date', 'data_1', 'data_2']]
tuples = [tuple(x) for x in subset.to_numpy()]
for pandas < 0.24 use
tuples = [tuple(x) for x in subset.values]
...
Getting the caller function name inside another function in Python? [duplicate]
...
Actually, you probably want inspect.currentframe().f_back.f_code.co_name, which is independent of Python version or implementation.
– 1313e
May 29 '19 at 7:45
...
Coalesce function for PHP?
...ay element is falsey will result in an error. $input['properties']['range_low'] ?: '?'
– Keyo
Jul 12 '11 at 23:28
...
ASP.NET MVC Razor Concatenation
...
You should wrap the inner part of the call with ( ):
<li id="item_@(item.TheItemId)">
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Missing include “bits/c++config.h” when cross compiling 64 bit program on 32 bit in Ubuntu
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While compiling in RHEL 6.2 (x86_64), I installed both 32bit and 64bit libstdc++-dev packages, but I had the "c++config.h no such file or directory" problem.
Resolution:
The directory /usr/include/c++/4.4.6/x86_64-redhat-linux was missing.
I did the foll...