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JavaScript: How do I print a message to the error console?
...second argument to the Error method is for the filename, which is an empty string here to prevent output of the useless filename and line number. It is possible to get the caller function but not in a simple browser independent way.
It would be nice if we could display the message with a warning...
How to add a progress bar to a shell script?
... order to accomplish the same thing you need to put \r\c at the end of the string, instead of just \r
– Justin Jenkins
Apr 2 '12 at 1:17
...
JavaScript data formatting/pretty printer
...operty in obj)
{
var value = obj[property];
if (typeof value == 'string')
value = "'" + value + "'";
else if (typeof value == 'object')
{
if (value instanceof Array)
{
value = "[ " + value + " ]";
}
else
{
var ood = DumpObject(val...
Just what is an IntPtr exactly?
...oints to.
In other words, an IntPtr is just like a void* -- but with the extra feature that it can (but shouldn't) be used for basic pointer arithmetic.
In order to dereference an IntPtr, you can either cast it to a true pointer (an operation which can only be performed in "unsafe" contexts) or y...
C++11 rvalues and move semantics confusion (return statement)
... This is pretty huge for returning expensive objects like containers & strings by value efficiently from methods.
Now where things get interesting with rvalue references, is that you can also use them as arguments to normal functions. This allows you to write containers that have overloads for...
How do I check to see if a value is an integer in MySQL?
...
I'll assume you want to check a string value. One nice way is the REGEXP operator, matching the string to a regular expression. Simply do
select field from table where field REGEXP '^-?[0-9]+$';
this is reasonably fast. If your field is numeric, just tes...
Truncating all tables in a Postgres database
...() requires Postgres 9.1 or later. In older versions concatenate the query string like this:
'TRUNCATE TABLE ' || quote_ident(_sch) || '.' || quote_ident(_tbl) || ' CASCADE';
Single command, no loop
Since we can TRUNCATE multiple tables at once we don't need any cursor or loop at all:
Passing...
Escape double quotes in a string
...
No.
Either use verbatim string literals as you have, or escape the " using backslash.
string test = "He said to me, \"Hello World\" . How are you?";
The string has not changed in either case - there is a single escaped " in it. This is just a way...
How to properly create an SVN tag from trunk?
...
files copied does not spend any extra space
– Carlos
Jul 25 '12 at 7:33
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c++文件流基本用法(ifstream, ostream,fstream) - C/C++ - 清泛网 - 专注C/C++及内核技术
...二: 读文件
#include <fstream.h>
void main
{
ifstream file;
char output[100];
int x;
file.open("file.txt");
file>>output;
cout<<output;
file>>x;
cout<<x;
file.close();
}
上面所讲的ofstream和ifstream只能进行读或是写，而fstream则同时...