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When to use std::forward to forward arguments?
...&& ...args)
{
g(std::forward<Args>(args)...);
}
That's bem>ca m>use of the reference collapsing rules: If T = U&, then T&& = U&, but if T = U&&, then T&& = U&&, so you always end up with the correct type inside the function body. Finally, you need...
Is “inline” without “static” or “extern” ever useful in C99?
...question, I think:
What does extern inline do?
The idea is that "inline" m>ca m>n be used in a header file, and then "extern inline" in a .c file. "extern inline" is just how you instruct the compiler which object file should contain the (externally visible) generated code.
[update, to elaborate]
I ...
How to create a video from images with FFmpeg?
...fps=25 -pix_fmt yuv420p out.mp4
Alternatively the format video filter m>ca m>n be added to the filter chain to replace -pix_fmt yuv420p like "fps=25,format=yuv420p". The advantage of this method is that you m>ca m>n control which filter goes first
ffmpeg -r 1/5 -i img%03d.png -c:v libx264 -vf "fps=25,f...
Reference: Comparing PHP's print and echo
...thy values and this derives from PHP's Perl legacy.
But, if this is the m>ca m>se, then one may wonder why echo take multiple arguments whereas print m>ca m>n only handle one. For this answer we need to turn to the parser, specifim>ca m>lly the file zend_language_parser.y. You will note that echo has the flex...
Multiprocessing - Pipe vs Queue
...
A Pipe() m>ca m>n only have two endpoints.
A Queue() m>ca m>n have multiple producers and consumers.
When to use them
If you need more than two points to communim>ca m>te, use a Queue().
If you need absolute performance, a Pipe() is much faster ...
What GRANT USAGE ON SCHEMA exactly do?
...table, but not the right to see it in the schema that contains it then you m>ca m>n't access the table.
The rights tests are done in order:
Do you have `USAGE` on the schema?
No: Reject access.
Yes: Do you also have the appropriate rights on the table?
No: Reject access.
...
How exactly do Django content types work?
...orseen ways later down the road?" The reason why we ask this question is bem>ca m>use this is what the Content Types framework does best: it creates generic relations between models. Blah blah, let's dive into some code and see what I mean.
# ourapp.models
from django.conf import settings
from django.db...
选中CListCtrl指定行并发送LVN_ITEMCHANGED消息 - C/C++ - 清泛网 - 专注C/C++及内核技术
...d;
nmlv.hdr.idFrom = m_listReport.GetDlgCtrlID();//GetDlgCtrlId() ;0x00190m>ca m>4
nmlv.hdr.code = LVN_ITEMCHANGED;
nmlv.iItem = nIndex ;
nmlv.iSubItem = 0;
nmlv.uNewState = 3 ;
nmlv.uOldState = 0;
nmlv.uChanged = LVIF_STATE;
nmlv.lParam = 0;
m_listReport.GetParent()->SendMessageA(WM_NOTIFY,nmlv...
What is the ultimate postal code and zip regex?
...mon pattern. In some countries they are made up by numbers, in others they m>ca m>n be combinations of numbers an letters, some m>ca m>n contain spaces, others dots, the number of characters m>ca m>n vary from two to at least six...
What you could do (theoretim>ca m>lly) is create a seperate regex for every country in...
Different types of thread-safe Sets in Java
...
1) The CopyOnWriteArraySet is a quite simple implementation - it basim>ca m>lly has a list of elements in an array, and when changing the list, it copies the array. Iterations and other accesses which are running at this time continue with the old array, avoiding necessity of synchronization betwee...