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Does free(ptr) where ptr is NULL corrupt memory?
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7.20.3.2 The free function
Synopsis
#include <stdlib.h>
void free(void *ptr);
Description
The free function causes the space pointed to by ptr to be deallocated, that is, made
available for further allocation...
Keep-alive header clarification
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Where is this info kept ("this connection is between computer A and server F")?
A TCP connection is recognized by source IP and port and destination IP and port. Your OS, all intermediate session-aware devices and the server's OS will re...
Find number of months between two Dates in Ruby on Rails
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(date2.year * 12 + date2.month) - (date1.year * 12 + date1.month)
more info at http://www.ruby-forum.com/topic/72120
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Add a column to a table, if it does not already exist
...nother variation that worked for me.
IF NOT EXISTS (SELECT 1
FROM INFORMATION_SCHEMA.COLUMNS
WHERE upper(TABLE_NAME) = 'TABLENAME'
AND upper(COLUMN_NAME) = 'COLUMNNAME')
BEGIN
ALTER TABLE [dbo].[Person] ADD Column
END
GO
EDIT:
Note that INFORMATION_SCHEMA views ma...
What are free monads?
I've seen the term Free Monad pop up every now and then for some time, but everyone just seems to use/discuss them without giving an explanation of what they are. So: what are free monads? (I'd say I'm familiar with monads and the Haskell basics, but have only a very rough knowledge of cat...
Is there a standard for storing normalized phone numbers in a database?
...ve to start at the top in a tree of some form, and format them as you have information. For example, country code 0 has a known format for the rest of the number, but for country code 5432 you might need to examine the area code before you understand the rest of the number.
You may also want to ha...
Resolve absolute path from relative path and/or file name
...d you name a file on a different drive if you wouldn't give that full path info on the commandline anyway?)
– Kurt Pfeifle
Aug 13 '10 at 19:45
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What are the pros and cons of the SVN plugins for Eclipse, Subclipse and Subversive? [closed]
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okay, lengthy and informative post. Not quite what I was looking for, but very insightful.
– Blitz
Nov 8 '12 at 20:09
1
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What is the difference between properties and attributes in HTML?
...s object will contain dozens of properties like: accept, accessKey, align, alt, attributes, autofocus, baseURI, checked, childElementCount, childNodes, children, classList, className, clientHeight, etc.
For a given DOM node object, properties are the properties of that object, and attributes are th...
How do malloc() and free() work?
I want to know how malloc and free work.
13 Answers
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