To simplify the language definition and keep code readable. void foo(int x = 2, int y); To call that and take advantage of the default value, you’d need syntax like this: foo(, 3); Which was probably felt to be too weird. Another alternative is specifying names in the argument list: foo(y : 3); A new … Read more
Use the information schema: SELECT column_name, column_default FROM information_schema.columns WHERE (table_schema, table_name) = (‘public’, ‘mytable’) ORDER BY ordinal_position; column_name │ column_default ─────────────┼──────────────────────────────────────── integer │ 2 text │ ‘I am default’::character varying moretext │ ‘I am also default’::character varying unimportant │ (4 rows) Up to the schema naming, this should work in any SQL database system.
The short answer is – it’s a slightly wider form of private. I’ll assume that you’re familiar with the distinction between public and private, and why it’s generally good practice to make methods and variables private if they’re going to be used solely internally to the class in question. Well, as an extension to that … Read more
It depends on the server configuration or the relevant directives session.gc_maxlifetime in php.ini. Typically the default is 24 minutes (1440 seconds), but your webhost may have altered the default to something else.
There isn’t a direct way to do this like you’ve attempted. The usual approach is to use “varargs” and check against the number of arguments. Something like: function f(arg1, arg2, arg3) if nargin < 3 arg3 = ‘some default’ end end There are a few fancier things you can do with isempty, etc., and you … Read more
PHP doesn’t support what you’re trying to do. The usual solution to this problem is to pass an array of arguments: function funcName($params = array()) { $defaults = array( // the defaults will be overidden if set in $params ‘value1’ => ‘1’, ‘value2’ => ‘2’, ); $params = array_merge($defaults, $params); echo $params[‘value1’] . ‘, ‘ … Read more
I recommend using .htaccess. You only need to add: DirectoryIndex home.php or whatever page name you want to have for it. EDIT: basic htaccess tutorial. 1) Create .htaccess file in the directory where you want to change the index file. no extension . in front, to ensure it is a “hidden” file Enter the line … Read more
It’s a new C++11 feature. It means that you want to use the compiler-generated version of that function, so you don’t need to specify a body. You can also use = delete to specify that you don’t want the compiler to generate that function automatically. With the introduction of move constructors and move assignment operators, … Read more
You can define the default value from the ‘data’ attribute. This is part of the Abstract “field” type (http://symfony.com/doc/2.0/reference/forms/types/field.html) $form = $this->createFormBuilder() ->add(‘status’, ‘choice’, array( ‘choices’ => array( 0 => ‘Published’, 1 => ‘Draft’ ), ‘data’ => 1 )) ->getForm(); In this example, ‘Draft’ would be set as the default selected value.
There’s really only two possibilities: null for reference types and new myType() for value types (which corresponds to 0 for int, float, etc) So you really only need to account for two cases: object GetDefaultValue(Type t) { if (t.IsValueType) return Activator.CreateInstance(t); return null; } (Because value types always have a default constructor, that call to … Read more