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Check existence of directory and create if doesn't exist
I often find myself writing R scripts that generate a lot of output. I find it cleaner to put this output into it's own directory(s). What I've written below will check for the existence of a directory and move into it, or create the directory and then move into it. Is there a better way to approach...
Optimise PostgreSQL for fast testing
I am switching to PostgreSQL from SQLite for a typical Rails application.
2 Answers
2
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What is the purpose of mock objects?
I am new to unit testing, and I continously hear the words 'mock objects' thrown around a lot. In layman's terms, can someone explain what mock objects are, and what they are typically used for when writing unit tests?
...
Test if string is a guid without throwing exceptions?
... class identifier</param>
/// <returns>
/// Positive or zero if class identifier was obtained successfully
/// Negative if the call failed
/// </returns>
[DllImport("ole32.dll", CharSet = CharSet.Unicode, ExactSpelling = true, PreserveSig = t...
What is the correct way of using C++11's range-based for?
...ents are not just simple integers,
but instances of a more complex class, with custom copy constructor, etc.
// A sample test class, with custom copy semantics.
class X
{
public:
X()
: m_data(0)
{}
X(int data)
: m_data(data)
{}
~X()
{}
X(const X&...
Convert a positive number to negative in C#
You can convert a negative number to positive like this:
22 Answers
22
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How do you create a static class in C++?
...ord to a class, like you can in C# for example, then you won't be able to without using Managed C++.
But the looks of your sample, you just need to create a public static method on your BitParser object. Like so:
BitParser.h
class BitParser
{
public:
static bool getBitAt(int buffer, int bitInd...
How can I create a “Please Wait, Loading…” animation using jQuery?
I would like to place a "please wait, loading" spinning circle animation on my site. How should I accomplish this using jQuery?
...
Like Operator in Entity Framework?
We're trying to implement the "LIKE" operator in Entity Framework for our entities with string fields, but it doesn't appear to be supported. Has anyone else tried to do something like this?
...
How to select all records from one table that do not exist in another table?
... all rows from table1 and for each row we attempt to find a row in table2 with the same value for the name column. If there is no such row, we just leave the table2 portion of our result empty for that row. Then we constrain our selection by picking only those rows in the result where the matching r...