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Metaprogramming in C++ to create functions that depend on their input parameters

I've been using metaprogramming for a while now. An interesting aspect to the ability to define an invalid (unavailable) type, allows you to declare functions that do not get selected by the C++ template system.

The following is a simple example where you want to test a version where the major, minor and patch version numbers are defined as an undefined type T which could be a signed or an unsigned type while compiling. If unsigned, the return value < 0; statement will generate a warning and for safer programming, you should not allow any warnings (we use the -Werror command line ...

What is a Golden File in software development?

Golden Files to run your test with large input and output dataWhile programming, one of the best thing to do to make sure that your software works as expected is to write tests.

Actually, if you write enough tests to make sure that the code works as expected, it should take you between two and three more time to finish up your project. So if it takes you one day to write a function, it will take you another two days to write good tests for that one function.

Many of those tests, especially as you construct more and more complex software, require large amount of input and output data. It's easy enough to test a function such as strlen(). It has one ...

Don't Repeat Yourself When Writing Software

Nature tends to repeat itself, or reproduce with similar structure, but code should not.

For a very long time now, we have been using languages that support having functions that one can call. That was not always the case, although even really old versions of BASIC had a GOSUB instruction, which it had no concept of local variables so it was rather difficult to use safely.

Functions allow you to avoid repetition. You write a small snippet of code (or maybe not that small) within a function and then you call that function to reuse that snippet over and over again. Good programmers tend to do that even with one liners. However, many others often think: well, it's just one line, why don't I return copy & paste that wherever I need it, it's going to be faster.

PHP eFax requires "ssl://" on RedHat EL7 and Ubuntu

We found out today that RedHat LE7 requires the use of the "ssl://" protocol instead of the default "tls://". The error we are getting from PHP looks like this:

PHP Warning:  stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages:
error:1409442E:SSL routines:ssl3_read_bytes:tlsv1 alert protocol version in .../lib/http_request.php on line 294
PHP Warning:  stream_socket_client(): Failed to enable crypto in .../lib/http_request.php on line 294
PHP Warning:  stream_socket_client(): unable to connect to tls://secure.efaxdeveloper.com:443 ...

PHP e-Fax requires valid SSL certificates (failed with code 1)

As e-Fax is updating their systems further to be compliant with various security systems, some new problems may arise on your servers.

The main one is an SSL error that is quite unclear.

Warning: stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed in /path-to-php-efax/http_request.php on line 294

As we can see, the error mentions a server certificate function and says it could not verify a certificate.

If your server is not 100% up to date with newest SSL versions or your web ...

To Do List Known Issues

Cannot Assign User to To Do List item

When you first install the module, I wouldn't be surprised if you'd want to create a To Do List item right away and then assign the task to one or more users.

It won't work.

Before users can be assigned a To Do List item, you must give them permission to be assigned to such an item. This is done in the usual permission place: Administer » User management » Permissions. You may also want to create a new role of people who deal with To Do List items.

Actually, the To Do List module comes with many permissions so you may want to ...

To Do List Installation

Basic To Do List Installation

Install the module as usual, generally under your sites/all/modules folder. On a Unix command line, you can use the tar tool like this:

  cd sites/all/modules
  tar -xf to_do.tar.gz

Then go to Administer » Site building » Modules and enable the To do list module.

Get URL2

SWF Action
Action Category: 
Movie
Action Details: 
0
Action Identifier: 
154
Action Structure: 
unsigned char    f_method;
Action Length: 
1 byte(s)
Action Stack: 
pop 2 (s)
Action Operation: 
s1 := pop();
s2 := pop();
s1.load(s2, f_method);
Action Flash Version: 
4

Pop two strings, the URL (s2) and the target name (s1).

All the usual HTML target names seem to be supported (_top, _blank, <frame name>, etc.) You can also use the special internal names _level0 to _level10. _level0 is the current movie. Other levels, I'm still not too sure how these can be used.

Metadata

Tag Info
Tag Number: 
77
Tag Type: 
Format
Tag Flash Version: 
8
Brief Description: 

This tag includes XML code describing the movie. The format is RDF compliant to the XMP as defined on W3C.

Tag Structure: 
struct swf_metadata {
	swf_tag			f_tag;		/* 77 */
	string			f_metadata;
};

The Metadata tag is used to describe the SWF movie in a robot readable form. It will be used by search engines to index your Flash movies.

The f_metadata string is an XML buffer defined using the RDF definition compliant with the XMP specification. You can find more information on the W3C and other websites:

RDF Primer
RDF Specification
XMP home page
Dublin Core

Note that this description can describe everything, from the entire movie to each single line of code in your action scripts.

The string must be UTF-8 encoded.

DefineEditText

Tag Info
Tag Number: 
37
Tag Type: 
Define
Tag Flash Version: 
4
Brief Description: 

An edit text enables the end users to enter text in a Flash window.

Tag Structure: 
struct swf_defineedittext {
	swf_tag			f_tag;		/* 37 */
	unsigned short		f_edit_id;
	swf_rect		f_rect;
	unsigned		f_edit_has_text : 1;
	unsigned		f_edit_word_wrap : 1;
	unsigned		f_edit_multiline : 1;
	unsigned		f_edit_password : 1;
	unsigned		f_edit_readonly : 1;
	unsigned		f_edit_has_color : 1;
	unsigned		f_edit_has_max_length : 1;
	unsigned		f_edit_has_font : 1;
	if(version >= 6) {
		unsigned		f_edit_reserved : 1;
		unsigned		f_edit_auto_size : 1;
	}
	else {
		unsigned		f_edit_reserved : 2;
	}
	unsigned		f_edit_has_layout : 1;
	unsigned		f_edit_no_select : 1;
	unsigned		f_edit_border : 1;
	unsigned		f_edit_reserved : 1;
	unsigned		f_edit_html : 1;
	unsigned		f_edit_use_outlines : 1;
	if(f_edit_has_font) {
		unsigned short		f_edit_font_id_ref;
		unsigned short		f_edit_font_height;
	}
	if(f_edit_has_color) {
		swf_rgba		f_edit_color;
	}
	if(f_edit_has_max_length) {
		unsigned short		f_edit_max_length;
	}
	if(f_edit_has_layout) {
		unsigned char		f_edit_align;
		unsigned short		f_edit_left_margin;
		unsigned short		f_edit_right_margin;
		signed short		f_edit_indent;
		signed short		f_edit_leading;
	}
	string			f_edit_variable_name;
	if(f_edit_has_text) {
		string			f_edit_initial_text;
	}
};

Additional interactivity has been added in V4.0 of the SWF format. This is given by the use of edit boxes offering the end users a way to enter text as if the SWF movie was in fact an interactive form.

The text is defined in a variable (accessible in action scripts). It can be dynamically assigned and retrieved. It is legal to have an empty string as the variable name (not dynamically accessible).