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Why does C++ require a user-provided default constructor to default-construct a const object?
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This was considered a defect (against all versions of the standard) and it was resolved by Core Working Group (CWG) Defect 253. The new wording for the standard states in http://eel.is/c++draft/dcl.init#7
A class type T is const-default-constructible if
def...
How to spread django unit tests over multiple files?
... you run your tests, the default behavior of the test utility is
to find all the test cases (that is, subclasses of unittest.TestCase)
in any file whose name begins with test, automatically build a test
suite out of those test cases, and run that suite.
From Django 1.6 documentation,
Tes...
LINQ Orderby Descending Query
...a foreign key associated table then you should include this table first, example below:
var itemList = from t in ctn.Items.Include(x=>x.Delivery)
where !t.Items && t.DeliverySelection
orderby t.Delivery.SubmissionDate descending
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Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor imple
...t*, int)
12.50% in main
6.73% in std::ostream::sentry::sentry(std::ostream&)
0.96% in std::string::_M_replace_safe(unsigned int, unsigned int, char const*, unsigned int)
0.96% in std::basic_ostringstream<char>::basic_ostringstream(std::_Ios_Openmode)
0.00% in std::fpos<int>::fpos(lon...
Import / Export database with SQL Server Server Management Studio
...t Studio 2012,2008..
First Copy your database file .mdf and log file .ldf & Paste in your sql server install file in Programs Files->Microsoft SQL Server->MSSQL10.SQLEXPRESS->MSSQL->DATA.
Then open Microsoft Sql Server .
Right Click on Databases -> Select Attach...option.
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How to redirect output with subprocess in Python?
...lbeit still available in Python 3.
Use os.system:
os.system(my_cmd)
If you really want to use subprocess, here's the solution (mostly lifted from the documentation for subprocess):
p = subprocess.Popen(my_cmd, shell=True)
os.waitpid(p.pid, 0)
OTOH, you can avoid system calls entirely:
impo...
How do I return early from a rake task?
... tend to use abort which is a better alternative in such situations, for example:
task :foo do
something = false
abort 'Failed to proceed' unless something
end
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Convert Time from one time zone to another in Rails
My created_at timestamps are stored in UTC:
5 Answers
5
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How do I erase an element from std::vector by index?
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template <typename T>
void remove(std::vector<T>& vec, size_t pos)
{
std::vector<T>::iterator it = vec.begin();
std::advance(it, pos);
vec.erase(it);
}
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What makes a SQL statement sargable?
...L optimizer can't use an index on myDate, even if one exists. It will literally have to evaluate this function for every row of the table. Much better to use:
WHERE myDate >= '01-01-2008' AND myDate < '01-01-2009'
Some other examples:
Bad: Select ... WHERE isNull(FullName,'Ed Jones') = 'Ed...