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A fast method to round a double to a 32-bit int explained
...
For those who'd like to convert to int64_t you can do that by shifting the mantissa left and then right by 13 bits. This will clear the exponent and the two bits from the 'magic' number, but will keep and propagate the sign to the entire 64-bit signed integer. un...
When should the volatile keyword be used in C#?
... ecx,eax
00401012 add eax,edx
00401014 cmp eax,64h
00401017 jl main+10h (401010h)
}
for (volatile int i = 0 ; i < 100 ; ++i)
00401019 mov dword ptr [esp],0
00401020 mov eax,dword ptr [esp]
00401023 cmp eax,64h
00401026 jge...
开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...物联网等各类关键业务场景。EMQX 采用 Erlang/OTP 编写，这是一种用于构建大规模可扩展软实时系统的编程语言。与 Mosquitto 不同，EMQX 在设计之初即采用了分布式集群架构，可以轻松实现弹性水平扩展，从而稳定承载大规模的 MQTT ...
App Inventor 2 串口调试 App 全方案技术调研 - App应用开发 - 清泛IT社区，为创新赋能！
...entor 2 串口调试 App 全方案技术调研
前言
串口调试器是硬件开发、嵌入式工程中最常用的工具。很多同学问：App Inventor 2 能不能做一个手机版的串口调试器？答案是：不仅能做，而且有多条技术路线可选。本文从源码层面深...
What are the mechanics of short string optimization in libc++?
...chine, 10 chars will fit in the short string. sizeof(string) is 12.
On a 64 bit machine, 22 chars will fit in the short string. sizeof(string) is 24.
A major design goal was to minimize sizeof(string), while making the internal buffer as large as possible. The rationale is to speed move constru...
Show current assembly instruction in GDB
...PC: 0x7ffff740d76d
#3 0x00007ffff7466eb5 in _IO_do_write () from /lib/x86_64-linux-gnu/libc.so.6
#4 0x00007ffff74671ff in _IO_file_overflow ()
from /lib/x86_64-linux-gnu/libc.so.6
#5 0x0000000000408756 in ?? ()
#6 0x0000000000403980 in ?? ()
#7 0x00007ffff740d76d in __libc_start_main ()
f...
Detect if a NumPy array contains at least one non-numeric value?
... As an extra complication the input could be a single float or numpy.float64 or even something oddball like a zero-dimensional array.
...
Bash empty array expansion with `set -u`
....4.
$ bash --version | head -n 1
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
$ set -u
$ arr=()
$ echo "foo: '${arr[@]}'"
foo: ''
There is a conditional you can use inline to achieve what you want in older versions: Use ${arr[@]+"${arr[@]}"} instead of "${arr[@]}".
$ function a...
Disable developer mode extensions pop up in Chrome
...018, this approach works in Chrome Version 69.0.3497.100 (Official Build) (64-bit):
Temporarily enable Developer mode in chrome://extensions
Uninstall the extension that causes the popup using the Load unpacked.
Click on Pack extension, and find and select the folder containing the extension files...
NGINX: upstream timed out (110: Connection timed out) while reading response header from upstream
...oxy_send_timeout 600;
proxy_read_timeout 600;
proxy_buffer_size 64k;
proxy_buffers 16 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
proxy_pass_header Set-Cookie;
proxy_redirect off;
proxy_hide_header Vary;
proxy_set_header Accept-Encoding '';
...