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When do I use a dot, arrow, or double colon to refer to members of a class in C++?
...how to use them. And where I said -> can only be used by a pointer that allocated on the heap by new? Below, the second item, I think I really make it clear that -> is for pointer. And before you downvote, you better try className::non_static_member_function() with c++14 by yourself. Referenc...
stringstream, string, and char* conversion confusion
...the temporary string const, because any changes to it might cause it to re-allocate and thus render cstr invalid. It is therefor safer to not to store the result of the call to str() at all and use cstr only until the end of the full expression:
use_c_str( stringstream.str().c_str() );
Of course,...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...user comes along later and puts more data into that column SQL has already allocated space for it and in it goes.
Another reason to use CHAR is similar to the second reason. If a programmer or user does a "batch" update to millions of rows, adding some sentence to a note field for example, you won'...
What are the differences between a multidimensional array and an array of arrays in C#?
...which is the base address of the array.
A multidimensional array therefore allocates a continuous memory block, while a jagged array does not have to be square, e.g. jagged[1].Length does not have to equal jagged[2].Length, which would be true for any multidimensional array.
Performance
Performance ...
What is the difference between Google App Engine and Google Compute Engine?
...e docker to install s/w in GAE, does it mean google takes care of creating/allocating a linux instance with basic configurations and then runs docker on tops of it? In essence, compute engine adds additional responsibility of VM configs. Am I right?
– old-monk
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How to “warm-up” Entity Framework? When does it get “cold”?
... will die together with the AppDomain.
All in all you should make sure to allocate contexts frequently and use them only for a short time, that you can start your application quickly, that you compile queries that are rarely used and provide pregenerated views for queries that are performance criti...
Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
...ntegerCache.high (calculated at runtime with minimum value 127) then a pre-allocated (cached) object is returned. So when you use 127 as parameter, you're getting two references to same cached object and getting true in the comparison of the references.
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Can a class member function template be virtual?
...on as virtual, as you can see, it hard to determine function signature and allocate vtable entries.
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Why Qt is misusing model/view terminology?
...ical and/or textual output to the portion of the bitmapped display that is allocated to its application. The controller interprets the mouse and keyboard inputs from the user, commanding the model and/or the view to change as appropriate. Finally, the model manages the behavior and data of the appli...
Proper practice for subclassing UIView?
...rsion here:
If your class mostly consists of subviews, the right place to allocate them is in the init methods. For views, there are two different init methods that could get called, depending on if your view is being instantiated from code or from a nib/storyboard. What I do is write my own setup ...