大约有 13,350 项符合查询结果（耗时：0.0246秒） [XML]
Array extension to remove object by value
...
extension Array where Element:Equatable {
public mutating func remove(_ item:Element ) {
var index = 0
while index < self.count {
if self[index] == item {
self.remove(at: index)
} else {
index += 1
}
...
Passing references to pointers in C++
...e calling scope, not an anonymous string pointer. Thus:
string s;
string* _s = &s;
myfunc(_s);
should compile just fine.
However, this is only useful if you intend to modify the pointer you pass to the function. If you intend to modify the string itself you should use a reference to the stri...
What is attr_accessor in Ruby?
I am having a hard time understanding attr_accessor in Ruby .
Can someone explain this to me?
19 Answers
...
Why doesn't String switch statement support a null case?
...h { // 1
2236: 28
default: 59
}
28: aload_3
29: ldc #22 // String Ea
31: invokevirtual #24 // Method java/lang/String.equals:(Ljava/lang/Object;)Z
34: ifne 49
37: aload_3
38: ldc #2...
What is the use of the @ symbol in PHP?
...l be ignored.
If you have set a custom error handler function with set_error_handler() then it will still get called, but this custom error handler can (and should) call error_reporting() which will return 0 when the call that triggered the error was preceded by an @...
...
Padding is invalid and cannot be removed?
...he code for CryptoStream.Dispose(bool) is: if (disposing) { if (!this._finalBlockTransformed) { this.FlushFinalBlock(); } this._stream.Close(); }
– Kevin Doyon
Mar 16 '17 at 20:09
...
What is Data Transfer Object?
... If I have model A and I need to pass it to two subsystems will there be A_DTO_1 and A_DTO_2 with the relevant fields of each? "DTOs can be to encapsulate parameters for method calls" --> So every class that wraps parameters is DTO even if this is not distributed system? Are't models in MVC th...
Updating the list view when the adapter data changes
...ter<String>(this,
android.R.layout.simple_list_item_1,
listItems));
to:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
...
Entity Framework - Include Multiple Levels of Properties
...x you can get (this is all one statement!):
viewModel.Instructors = await _context.Instructors
.Include(i => i.OfficeAssignment)
.Include(i => i.CourseAssignments)
.ThenInclude(i => i.Course)
.ThenInclude(i => i.Enrollments)
.ThenInclude...
Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
...re readable.
Using the sample data provided:
>>> %timeit df3.reset_index().drop_duplicates(subset='index', keep='first').set_index('index')
1000 loops, best of 3: 1.54 ms per loop
>>> %timeit df3.groupby(df3.index).first()
1000 loops, best of 3: 580 µs per loop
>>> %tim...