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Templated check for the existence of a class member function?
...e:
#include <iostream>
struct Hello
{
int helloworld() { return 0; }
};
struct Generic {};
// SFINAE test
template <typename T>
class has_helloworld
{
typedef char one;
struct two { char x[2]; };
template <typename C> static one test( decltype(&C::hellow...
(Built-in) way in JavaScript to check if a string is a valid number
...xamples
isNaN(123) // false
isNaN('123') // false
isNaN('1e10000') // false (This translates to Infinity, which is a number)
isNaN('foo') // true
isNaN('10px') // true
Of course, you can negate this if you need to. For example, to implement the IsNumeric example you gav...
How Do I 'git fetch' and 'git merge' from a Remote Tracking Branch (like 'git pull')
...
170
You don't fetch a branch, you fetch an entire remote:
git fetch origin
git merge origin/an-othe...
SQL NVARCHAR and VARCHAR Limits
... selection criteria the string containing the dynamic SQL is growing over 4000 chars. Now, I understand that there is a 4000 max set for NVARCHAR(MAX) , but looking at the executed SQL in Server Profiler for the statement
...
Resolving LNK4098: defaultlib 'MSVCRT' conflicts with
...where. The CRT DLL used by your program has a different name (like msvcrt90.dll).
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How do I get the value of text input field using JavaScript?
... [whole_number] to get the desired occurrence. For the first element, use [0],
for the second one use 1, and so on...
Method 2:
Use
document.getElementsByClassName('class_name')[whole_number].value which returns a Live HTMLCollection
For example, document.getElementsByClassName("searc...
What method in the String class returns only the first N characters?
...f (string.IsNullOrEmpty(str))
return str;
return str.Substring(0, Math.Min(str.Length, maxLength));
}
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Return value in a Bash function
...you can specify with it is the function's own exit status (a value between 0 and 255, 0 meaning "success"). So return is not what you want.
You might want to convert your return statement to an echo statement - that way your function output could be captured using $() braces, which seems to be exact...
MySQL error: key specification without a key length
...fied implicitly within a bracket right after its declaration, i.e VARCHAR(200) will limit it to 200 characters long only.
Sometimes, even though you don’t use TEXT or BLOB related type in your table, the Error 1170 may also appear. It happens in a situation such as when you specify VARCHAR column...
How to use random in BATCH script?
...
120
%RANDOM% gives you a random number between 0 and 32767.
Using an expression like SET /A test=%R...