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How to convert ‘false’ to 0 and ‘true’ to 1 in Python
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@AlbertChen: no, because numpy arrays broadcast comparisons and don't produce a boolean value. Instead, comparisons produce an array of boolean values. I'm not sure what you expect from an arrayvalue == 'true' comparison, the question I answered here is specific to a ...
Populate data table from data reader
... conn = new SqlConnection(connString);
string query = "SELECT * FROM Customers";
SqlCommand cmd = new SqlCommand(query, conn);
conn.Open();
SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
DataTable dtSchema = ...
Can I use if (pointer) instead of if (pointer != NULL)?
...s, so readability or conciseness isn't that much of an issue here.
Dynamic casts. Casting a base-class pointer to a particular derived-class one (something you should again try to avoid, but may at times find necessary) always succeeds, but results in a null pointer if the derived class doesn't matc...
Preserving order with LINQ
...p a source element by index to a result element
AsEnumerable
Cast
Concat
Select
ToArray
ToList
Preserves Order. Elements are filtered or added, but not re-ordered.
Distinct
Except
Intersect
OfType
Prepend (new in .net 4.7.1)
Skip
SkipWhile
Take
TakeWhile
Where
Zip (new in .net 4)
Destroys O...
What are all the common undefined behaviours that a C++ programmer should know about? [closed]
...ts in the number (e.g. int64_t i = 1; i <<= 72 is undefined)
Types, Cast and Const
Casting a numeric value into a value that can't be represented by the target type (either directly or via static_cast)
Using an automatic variable before it has been definitely assigned (e.g., int i; i++; cout...
What are the differences between “generic” types in C++ and Java?
...acro). In Java they are basically syntactic sugar to minimize boilerplate casting of Objects. Here is a pretty decent introduction to C++ templates vs Java generics.
To elaborate on this point: when you use a C++ template, you're basically creating another copy of the code, just as if you used a ...
Do I have to guard against SQL injection if I used a dropdown?
...
$size = filter_input(INPUT_POST, "size", FILTER_VALIDATE_INT);
echo '<select name="size">';
foreach($sizes as $i => $s) {
echo '<option value="' . $i . '"' . ($i == $size ? ' selected' : '') . '>' . $s . '</option>';
}
echo '</select>';
Then you can use $size in yo...
Resolving MSB3247 - Found conflicts between different versions of the same dependent assembly
...ing up the Options dialog (Tools -> Options...).
In the left-hand tree, select the Projects and Solutions node, and then select Build and Run.
Note: if this node doesn't show up, make sure that the checkbox at the bottom of the dialog Show all settings is checked.
In the tools/options page th...
Converting from IEnumerable to List [duplicate]
...ections.IEnumerable instead of IEnumerable<T> you can use enumerable.Cast<object>().ToList()
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How do you test functions and closures for equality?
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Simplest way is designate the block type as @objc_block, and now you can cast it to an AnyObject which is comparable with ===. Example:
typealias Ftype = @objc_block (s:String) -> ()
let f : Ftype = {
ss in
println(ss)
}
let ff : Ftype = {
sss in
...