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If my interface must return Task what is the best way to have a no-operation implementation?
...mprove performance even more if you cache the already completed task since all instances of completed tasks are the same:
public static class TaskExtensions
{
public static readonly Task CompletedTask = Task.FromResult(false);
}
With TaskExtensions.CompletedTask you can use the same instance ...
Regular vs Context Free Grammars
...ammar is either right or left linear, whereas context free grammar is basically any combination of terminals and non-terminals. Hence you can see that regular grammar is a subset of context-free grammar.
So for a palindrome for instance, is of the form,
S->ABA
A->something
B->something
...
Changing UIImage color
...
Swift 4.2 Solution
extension UIImage {
func withColor(_ color: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, scale)
guard let ctx = UIGraphicsGetCurrentContext(), let cgImage = cgImage else { return self }
color.setFill()
...
How to disable / enable dialog negative positive buttons?
...ertDialog.Builder(MainActivity.this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle("Alert dialog title");
builder.setMessage("This is the example code snippet to disable button if edittext attached to dialog is empty.");
builder.setPositiveButton("PositiveButton",
new...
What is a web service endpoint?
...Service– a collection of related endpoints.
http://www.ehow.com/info_12212371_definition-service-endpoint.html
The endpoint is a connection point where HTML files or active server pages are exposed. Endpoints provide information needed to address a Web service endpoint. The endpoint provi...
Trigger a button click with JavaScript on the Enter key in a text box
... This worked for me due to fact that the inline method, instead of calling function with similar code in it, allows you to return false on the call and avoid postback. In my case the "click" method invokes a __doPostback async call and without the "return false;" would just reload the page.
...
Reading a file line by line in Go
...since the OP asked to scan over a file, it would be trivial to first file, _ := os.Open("/path/to/file.csv") and then scan over the file handle: scanner := bufio.NewScanner(file)
– Evan Plumlee
Aug 18 '13 at 13:28
...
CGridCellNumeric - A numeric cell class for the MFC Grid - C/C++ - 清泛网 - 专注IT技能提升
...t of the cell.
Input validation is done on the fly as the user is typing. All validation is done in the EN_UPDATE message handler, so any cut/copy and paste operations are immediately validated. If the user deletes the text in the cell, the value is set to zero.
Using the CGridCellNumeri...
CGridCellNumeric - A numeric cell class for the MFC Grid - C/C++ - 清泛网 - 专注IT技能提升
...t of the cell.
Input validation is done on the fly as the user is typing. All validation is done in the EN_UPDATE message handler, so any cut/copy and paste operations are immediately validated. If the user deletes the text in the cell, the value is set to zero.
Using the CGridCellNumeri...
CGridCellNumeric - A numeric cell class for the MFC Grid - C/C++ - 清泛网 - 专注IT技能提升
...t of the cell.
Input validation is done on the fly as the user is typing. All validation is done in the EN_UPDATE message handler, so any cut/copy and paste operations are immediately validated. If the user deletes the text in the cell, the value is set to zero.
Using the CGridCellNumeri...