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Finding out whether a string is numeric or not
...)validateString:(NSString *)string withPattern:(NSString *)pattern
{
NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];
NSAssert(regex, @"Unable to create regular expr...
Getting raw SQL query string from PDO prepared statements
... $query = preg_replace($keys, $params, $query, 1, $count);
#trigger_error('replaced '.$count.' keys');
return $query;
}
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'Specified condition “$(PackageAsSingleFile)” evaluates to “” instead of a boolean?
The visual studio 2012 on my PC get the following error message when preview in the "Public Web". I need to restart VS to get rid of the error message.
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Create directories using make file
...ts, there are other ways to fix the 'do not know how to make output/debug' error that results. One is to remove the dependency on the the 'directories' line. This works because 'mkdir -p' does not generate errors if all the directories it is asked to create already exist. The other is the mechani...
Why does SIGPIPE exist?
...ite output. Without SIGPIPE, unless these programs explicitly handle write errors and immediately exit (which might not be the desired behavior for all write errors, anyway), they will continue running until they run out of input even if their output pipe has been closed. Sure you can duplicate the ...
How to avoid “cannot load such file — utils/popen” from homebrew on OSX
I'm getting an error when I run brew in the terminal:
9 Answers
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Plot correlation matrix into a graph
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edited Oct 2 '12 at 2:05
Jeromy Anglim
29.4k2424 gold badges104104 silver badges162162 bronze badges
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RequestDispatcher.forward() vs HttpServletResponse.sendRedirect()
...e (e.g. validation, business logic, login the user, etc).
If there are any errors, then you normally want to forward the request back to the same page and display the errors there next to the input fields and so on. You can use the RequestDispatcher for this.
If a POST is successful, you normally wa...
const vs constexpr on variables
...es a compile-time constant. For example:
constexpr double PI3 = PI1; // error
but:
constexpr double PI3 = PI2; // ok
and:
static_assert(PI1 == 3.141592653589793, ""); // error
but:
static_assert(PI2 == 3.141592653589793, ""); // ok
As to which you should use? Use whichever meets yo...
How to find keys of a hash?
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edited Mar 6 '19 at 15:05
Jost
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answered Aug 3 '11 at 3:02
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