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Static class initializer in PHP
...Foo::init();
This way, the initialization happens when the class file is included. You can make sure this only happens when necessary (and only once) by using autoloading.
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Sass Variable in CSS calc() function
... // example: if size set to 14px, it will be 14px * 16 / 16 = 14px
@include media-breakpoint-down(lg) {
:root {
--size: #{$base-size};
}
}
// if it is bigger then XL it will set size rate to 24/16;
// example: if size set to 14px, it will be 14px * 24 / 16 = 2...
How do I get a UTC Timestamp in JavaScript?
...mezone of a certain date object is to construct it from a date string that includes the timezone. (I had problems getting that to work in an older Android browser.)
Note that getTime() returns milliseconds, not plain seconds.
For a UTC/Unix timestamp, the following should suffice:
Math.floor((new...
Flexbox: center horizontally and vertically
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Delete duplicate rows from small table
... my answer at How to delete duplicate rows without unique identifier which includes more information.
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conflicting types for \'dev_t\'的原因 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...es for dev_t ，这貌似是一个Linux历史遗留问题，需要调整include头文件的顺序。在Linux下编译程序有时会遇到这种问题，这貌似是一个Linux历史遗留问题:
/usr/include/sys/types.h:62: error: conflicting types for ‘dev_t’
/usr/include/linux/...
What is a memory fence?
...te instructions out of order to make maximum use of the available silicon (including memory read/writes). Because the hardware enforces instructions integrity you never notice this in a single thread of execution. However for multiple threads or environments with volatile memory (memory mapped I/O f...
How to convert an integer to a string in any base?
...ility with ancient versions of Python, you can either use gmpy (which does include a fast, completely general int-to-string conversion function, and can be built for such ancient versions -- you may need to try older releases since the recent ones have not been tested for venerable Python and GMP re...
How do I concatenate const/literal strings in C?
..." TABLE ; // note no + or . or anything
const char *qry = // include comments in a string
" SELECT * " // get all fields
" FROM " SCHEMA "." TABLE /* the table */
" WHERE x = 1 " /* the filter */
;
...
C++ preprocessor __VA_ARGS__ number of arguments
...NUMARGS(...) (sizeof((int[]){__VA_ARGS__})/sizeof(int))
Full example:
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#define NUMARGS(...) (sizeof((int[]){__VA_ARGS__})/sizeof(int))
#define SUM(...) (sum(NUMARGS(__VA_ARGS__), __VA_ARGS__))
void sum(int numargs, ....