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Setting variable to NULL after free
... when freeing a struct that holds resources, pointers to allocated memory, file handles, etc., as I free the contained memory pointers and close the contained files, I NULL respective members. Then if one of the resources is accessed via a dangling pointer by mistake, the program tends to fault righ...
typedef fixed length array
... I tried it in a code sample. I put typedef char[3] type24; in my header file. The compiler did not complain about it. But when I defined a function void foo(type24 val) {} in my C file, it did complain. I would like to be able to define functions like type24_to_int32(type24 val) instead of t...
How to return an array from JNI to Java?
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Simple solution is that write the array data in a file from C,and then access the file from Java
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Rails has_and_belongs_to_many migration
...tical order.
First run your migrations, then edit the generated migration file.
Rails 3
rails g migration create_restaurants_users_table
Rails 4:
rails g migration create_restaurants_users
Rails 5
rails g migration CreateJoinTableRestaurantUser restaurants users
From the docs:
There ...
Should MySQL have its timezone set to UTC?
...n tables
in the mysql database have been created and populated.
in the file "my.cnf"
default_time_zone='+00:00'
or
timezone='UTC'
@@global.time_zone variable
To see what value they are set to
SELECT @@global.time_zone;
To set a value for it use either one:
SET GLOBAL time_zone = '+8:0...
Debug.Assert vs Exception Throwing
... in production code by using Trace.Assert. You can even use the app.config file to re-direct production assertions to a text file rather than being rude to the end-user.
– HTTP 410
Nov 23 '11 at 14:55
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JavaScript function order: why does it matter?
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The main reason is probably that JSLint does only one pass on the file so it doesn't know you will define such a function.
If you used functions statement syntax
function foo(){ ... }
There is actually no difference at all where you declare the function (it always behaves as if the decl...
Simple logical operators in Bash
...t on operators such as -n $variable to test if a variable is empty and -e $file to test if a file exists. There are also string equality operators: "$string1" == "$string2" (beware that the right-hand side is a pattern, e.g. [[ $foo == a* ]] tests if $foo starts with a while [[ $foo == "a*" ]] tests...
JavaScript OOP in NodeJS: how?
... want less "hacky", you should use inheritance library or such.
Well in a file animal.js you would write:
var method = Animal.prototype;
function Animal(age) {
this._age = age;
}
method.getAge = function() {
return this._age;
};
module.exports = Animal;
To use it in other file:
var A...
How are ssl certificates verified?
..."send an email from webmaster@<domain-being-verified> or "Place this file on your domain to prove you own it." However, there have indeed been problems with people getting CAs to issue certificates for domains they don't own - famously someone managed to get a shady CA to issue them a certifi...