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C++及Windows异常处理(try，catch; __try,__finally, __except) - C/C++ - ...
...ss File_handle {
FILE* p;
public:
File_handle(const char* n, const char* a)
{ p = fopen(n,a); if (p==0) throw Open_error(errno); }
File_handle(FILE* pp)
{ p = pp; if (p==0) throw Open_error(errno); }
~File_handle() { fclose(p); }
...
Reload Flask app when template file changes
...pplication when the templates change (or any other file), you can pass the extra_files argument to Flask().run(), a collection of filenames to watch: any change on those files will trigger the reloader.
Example:
from os import path, walk
extra_dirs = ['directory/to/watch',]
extra_files = extra_di...
Programmer Puzzle: Encoding a chess board state throughout a game
...e {
private final Node left;
private final Node right;
private final String label;
private final int weight;
private Node(String label, int weight) {
this.left = null;
this.right = null;
this.label = label;
this.weight = weight;
}
public Node(Node left, Node right) {
...
What is the curiously recurring template pattern (CRTP)?
...ter
{
public:
Writer() { }
~Writer() { }
void write(const char* str) const
{
static_cast<const T*>(this)->writeImpl(str); //here the magic is!!!
}
};
class FileWriter : public Writer<FileWriter>
{
public:
FileWriter(FILE* aFile) { mFile = aFile; ...
Insert a string at a specific index
How can I insert a string at a specific index of another string?
18 Answers
18
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Reflecting parameter name: abuse of C# lambda expressions or syntax brilliance?
...ple
C#:
public class Class1
{
public static void Foo(Func<object, string> f)
{
Console.WriteLine(f.Method.GetParameters()[0].Name);
}
}
F#:
Class1.Foo(fun yadda -> "hello")
Result:
"arg" is printed (not "yadda").
As a result, library designers should either avoi...
JSON: why are forward slashes escaped?
...n embedding JSON in a <script> tag, which doesn't allow </ inside strings, like Seb points out.
Some of Microsoft's ASP.NET Ajax/JSON API's use this loophole to add extra information, e.g., a datetime will be sent as "\/Date(milliseconds)\/". (Yuck)
...
launch sms application with an intent
..._INT >= Build.VERSION_CODES.KITKAT) // At least KitKat
{
String defaultSmsPackageName = Telephony.Sms.getDefaultSmsPackage(this); // Need to change the build to API 19
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.setType("text/plain");
...
Array.size() vs Array.length
...
Is there something that does work with Strings if size doesn't work?
– Chris
Apr 17 '17 at 14:42
2
...
Is there a way to provide named parameters in a function call in JavaScript?
...se to what you want, but it is based on the output of Function.prototype.toString [ES5], which is implementation dependent to some degree, so it might not be cross-browser compatible.
The idea is to parse the parameter names from the string representation of the function so that you can associate t...