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make_unique and perfect forwarding
...Worse, void f( int, int ) {} is not exception safe either!: typedef unique_ptr<int> up; f( *up(new int(5)), *up(new int(10)))...
– David Rodríguez - dribeas
Jul 16 '12 at 13:07
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Comparing HTTP and FTP for transferring files
...
Here's a performance comparison of the two. HTTP is more responsive for request-response of small files, but FTP may be better for large files if tuned properly. FTP used to be generally considered faster. FTP requires a control channel and state be maintained beside...
Ternary operator is twice as slow as an if-else block?
... xor edx,edx
0000007e 83 7E 04 00 cmp dword ptr [esi+4],0
00000082 7E 1C jle 000000A0
00000084 8B 44 96 08 mov eax,dword ptr [esi+edx*4+8]
33: {
34: if (i > 0)
00000088 85 C0 ...
Windows x64编程中寄存器的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
... r12,rcx
000000013F791583 4C 89 6C 24 30 mov qword ptr [rsp+30h],r13 // 第 7 个参数
000000013F791588 45 8D 45 01 lea r8d,[r13+1] // 第 3 个参数
000000013F79158C 45 33 C9 xor r9d,r9d ...
Why is SCTP not much used/known
... 2020 edit: it's being removed from the core 5G network (no more Diameter, HTTP/2 instead) and will be only used in the 5G radio access network between antennas and core.
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Do sealed classes really offer performance Benefits?
... ebp,esp
00000003 sub esp,8
00000006 cmp dword ptr ds:[00585314h],0
0000000d je 00000014
0000000f call 70032C33
00000014 xor edx,edx
00000016 mov dword ptr [ebp-4],edx
00000019 mov ecx,588230h
0000001e call FFEEEB...
Create a pointer to two-dimensional array
...u wanna make a pointer to the first element of the array
uint8_t (*matrix_ptr)[20] = l_matrix;
With typedef, this looks cleaner
typedef uint8_t array_of_20_uint8_t[20];
array_of_20_uint8_t *matrix_ptr = l_matrix;
Then you can enjoy life again :)
matrix_ptr[0][1] = ...;
Beware of the pointer...
How to find SQL Server running port?
...this:
USE master
GO
xp_readerrorlog 0, 1, N'Server is listening on'
GO
http://www.mssqltips.com/sqlservertip/2495/identify-sql-server-tcp-ip-port-being-used/
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...
Do I need to heartbeat to keep a TCP connection open?
...registry or via setsockopt.
The default keep-alive interval is 2 hours.
http://msdn.microsoft.com/en-us/library/ms819735.aspx
You might need to implement your own heart beat and disable TCP keep-alive on windows if the 2 hour keep-alive alive is not desirable.
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How to find the port for MS SQL Server 2008?
...e is listening on port number 61499.
The other methods you can find here: http://sqlandme.com/2013/05/01/sql-server-finding-tcp-port-number-sql-instance-is-listening-on/
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