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Is it better in C++ to pass by value or pass by constant reference?
...r iterators and for function objects (lambdas, classes deriving from std::*_function).
This was especially true before the existence of move semantics. The reason is simple: if you passed by value, a copy of the object had to be made and, except for very small objects, this is always more expensive...
What does `m_` variable prefix mean?
I often see m_ prefix used for variables ( m_World , m_Sprites ,...) in tutorials, examples and other code mainly related to game development.
...
What is @RenderSection in asp.net MVC
...
If you have a _Layout.cshtml view like this
<html>
<body>
@RenderBody()
@RenderSection("scripts", required: false)
</body>
</html>
then you can have an index.cshtml content view like this
...
How can I get all the request headers in Django?
...m HTTP headers.
From the documentation:
With the exception of CONTENT_LENGTH and CONTENT_TYPE, as given above, any HTTP headers in the request are converted to META keys by converting all characters to uppercase, replacing any hyphens with underscores and adding an HTTP_ prefix to the name.
...
What is :: (double colon) in Python when subscripting sequences?
...n custom classes to make it do whatever you want
class C(object):
def __getitem__(self, k):
return k
# Single argument is passed directly.
assert C()[0] == 0
# Multiple indices generate a tuple.
assert C()[0, 1] == (0, 1)
# Slice notation generates a slice object.
assert C()[1:2:3] =...
C++ Redefinition Header Files (winsock2.h)
...list that <windows.h> is included after <winsock2.h> or define _WINSOCKAPI_ first:
#define _WINSOCKAPI_ // stops windows.h including winsock.h
#include <windows.h>
// ...
#include "MyClass.h" // Which includes <winsock2.h>
See also this.
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What is the difference between varchar and varchar2 in Oracle?
...aracters with a maximum length of 4000 bytes. If the init.ora parameter max_string_size is default, the maximum length of a VARCHAR2 can be 4000 bytes. If the init.ora parameter max_string_size = extended, the maximum length of a VARCHAR2 can be 32767 bytes
The VARCHAR data type stores character st...
What is the difference between char, nchar, varchar, and nvarchar in SQL Server?
...on as illustrated below.
DECLARE @T TABLE
(
C1 VARCHAR(20) COLLATE Chinese_Traditional_Stroke_Order_100_CS_AS_KS_WS,
C2 NVARCHAR(20)COLLATE Chinese_Traditional_Stroke_Order_100_CS_AS_KS_WS
)
INSERT INTO @T
VALUES (N'中华人民共和国',N'中华人民共和国'),
(N'abc',N'abc')...
GitHub pages are not updating
...
you can tell jekyll to show "future" posts by adding future: true to your _config.yml
and/or add timezone: TIMEZONE to specify your timezone.
See https://jekyllrb.com/docs/configuration/ for more info.
share
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When would anyone use a union? Is it a remnant from the C-only days?
...For example, let's say you want to create your own Variant type:
struct my_variant_t {
int type;
union {
char char_value;
short short_value;
int int_value;
long long_value;
float float_value;
double double_value;
void* ptr_value;
}...