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How do you detect Credit card type based on number?
...er. IINs are six digits long, so a complete card number must be 7 digits (minimum) and must pass the Luhn check. There’s no need for “proof” that Mastercard numbers have anything other than 16 digits; the point is that, regardless of the situation today, in future they might issue cards with...
Logging levels - Logback - rule-of-thumb to assign log levels
...to be immediately visible on a console, so be conservative and keep to
a minimum.
debug - detailed information on the flow through the system. Expect these to be written to logs only.
trace - more detailed information. Expect these to be written to logs only.
...
How to allocate aligned memory only using the standard library?
...r, this is dodgy and non-portable — other malloc packages have different minimum alignments, and therefore assuming one thing when it does something different would lead to core dumps. Within broad limits, this solution is portable.
Someone else mentioned posix_memalign() as another way to get t...
How do I get the real .height() of a overflow: hidden or overflow: scroll div?
...ible on the screen due to overflow. The scrollHeight value is equal to the minimum clientHeight the element would require in order to fit all the content in the viewpoint without using a vertical scrollbar. It includes the element padding but not its margin.
...
Simplest way to do a fire and forget method in c# 4.0
...moot :). The best answer is arguably "don't", but that fell short of the minimum answer length, so I focused on providing a concise solution that avoids issues present in other answers. Arguments are easily wrapped in a closure, and with no return value, using Task becomes an implementation detai...
Jelly Bean DatePickerDialog — is there a way to cancel?
...y needs because I wanted to reduce boilerplate code in client classes to a minimum. Full usage example:
class YourActivity extends SherlockFragmentActivity implements OnDateSetListener
// ...
Bundle b = new Bundle();
b.putInt(DatePickerDialogFragment.YEAR, 2012);
b.putInt(DatePickerDialogFragment...
How do I choose grid and block dimensions for CUDA kernels?
...he launch configurator returned block size
int minGridSize; // The minimum grid size needed to achieve the maximum occupancy for a full device launch
int gridSize; // The actual grid size needed, based on input size
int* h_vec1 = (int*) malloc(N*sizeof(int));
int* h_vec2...
How to find the kth smallest element in the union of two sorted arrays?
...nt main() {
int a[] = {5,4,3};
int b[] = {2,1,0};
int k = 1; // find minimum value, the 1st smallest value in a,b
int i = k - 1; // convert to zero-based indexing
int v = nsmallest_iter(a, a + SIZE(a), b, b + SIZE(b),
SIZE(a)+SIZE(b)-1-i, std::greater<int>()...
Difference between UTF-8 and UTF-16?
... are variable length encodings. However, in UTF-8 a character may occupy a minimum of 8 bits, while in UTF-16 character length starts with 16 bits.
Main UTF-8 pros:
Basic ASCII characters like digits, Latin characters with no accents, etc. occupy one byte which is identical to US-ASCII representa...
How can I pass selected row to commandLink inside dataTable or ui:repeat?
...eral ways to achieve the requirement.
If your servletcontainer supports a minimum of Servlet 3.0 / EL 2.2, then just pass it as an argument of action/listener method of UICommand component or AjaxBehavior tag. E.g.
<h:commandLink action="#{bean.insert(item.id)}" value="insert" />
In combin...