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ruby system command check exit code
...us object, you can get the command's process information from this object, including: status code, execution status, pid, etc.
Some useful methods of the $? object:
$?.exitstatus => return error code
$?.success? => return true if error code is 0, otherwise false
$?.pid => cre...
Referring to a file relative to executing script
In a bash script I'm writing, I use source to include the variable defined in a configuration file. The script to be executed is act.sh , while the script to be source d is act.conf.sh , so in act.sh I have:
...
与复制构造函数相关的错误.例如:0x77D9FCAA (ntdll.dll) (prog31.exe 中)处...
...源的情况下应该应当被正确处理。
错误示例代码：
#include <iostream>
#include <cstring>
using std::cout;
using std::endl;
//复制构造函数举例1
//此例包含指针成员，没有复制构造函数出错
struct Node
{
Node(char *n="",int a = 0)
{
n...
LaTeX package for syntax highlighting of code in various languages
...I have used listings with beamer, but you have to specify that frames that include listings are [fragile].
– Supernormal
Sep 1 '16 at 9:23
add a comment
| ...
JSON.stringify without quotes on properties?
...). This will give you all that you want. follow this link for more options including depth of the application of method. http://nodejs.org/api/util.html#util_util_inspect_object_options
So, what you are looking for is basically an object inspector not a JSON converter. JSON format specifies that al...
Simple way to transpose columns and rows in SQL?
... has the dynamic capability to append more rows as your dataset expands to include more policy numbers.
Horizontal expansion
Unlike the PIVOT, the cursor excels in this area as it is able to expand to include newly added document, without altering the script.
Performance breakdown
The major limita...
MySQL Error 1215: Cannot add foreign key constraint
...
@www.jensolsson.se You are correct, if the PK includes one or more string columns then they must use the same character set and collation. In this specific case the PK was an INT so the character set of the table and/or columns was not relevant.
– I...
Logging errors in ASP.NET MVC
...est exception loggers I've ever used. I read a post saying that MS should include it in ASP.net and I agree.
– dtc
May 20 '09 at 18:52
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CSS selector - element with a given child [duplicate]
...n {
color: red;
}
A more recent "Selectors Level 4 Editor’s Draft" includes "The Relational Pseudo-class: :has()"
:has() would allow an author to select an element based on its contents. My understanding is it was chosen to provide compatibility with jQuery's custom :has() pseudo-selector*.
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Equation for testing if a point is inside a circle
...lementation.
// compile gcc -O3 <filename>.c
// run: time ./a.out
#include <stdio.h>
#include <stdlib.h>
#define TRUE (0==0)
#define FALSE (0==1)
#define ABS(x) (((x)<0)?(0-(x)):(x))
int xo, yo, R;
int inline inCircle( int x, int y ){ // 19.1, 19.1, 19.1
int dx = ABS(x...