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Why are preprocessor macros evil and what are the alternatives?

.... Another example is "if else" in macros, say we have this: #define safe_divide(res, x, y) if (y != 0) res = x/y; and then if (something) safe_divide(b, a, x); else printf("Something is not set..."); It actually becomes completely the wrong thing.... Replacement: real functions. 3) Ma...
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Why does SSL handshake give 'Could not generate DH keypair' exception?

...s JCE provider suggestion did. Here are the steps I took using Java 1.6.0_65-b14-462 on Mac OSC 10.7.5 1) Download these jars: bcprov-jdk15on-154.jar bcprov-ext-jdk15on-154.jar 2) move these jars to $JAVA_HOME/lib/ext 3) edit $JAVA_HOME/lib/security/java.security as follows: security.provid...
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How do I unit test web api action method when it returns IHttpActionResult?

... MixedCodeStandardController : ApiController { public readonly object _data = new Object(); public IHttpActionResult Get() { return Ok(_data); } public IHttpActionResult Get(int id) { return Content(HttpStatusCode.Success, _data); } } Testing the class: var ...
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Reload django object from database

... As of Django 1.8 refreshing objects is built in. Link to docs. def test_update_result(self): obj = MyModel.objects.create(val=1) MyModel.objects.filter(pk=obj.pk).update(val=F('val') + 1) # At this point obj.val is still 1, but the value in the database # was updated to 2. The ob...
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How to get parameters from a URL string?

I have a HTML form field $_POST["url"] having some URL strings as the value. Example values are: 13 Answers ...
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“Large data” work flows using pandas

...fields to a specific group, and defines # what you want to have as data_columns. # you might want to create a nice class wrapping this # (as you will want to have this map and its inversion) group_map = dict( A = dict(fields = ['field_1','field_2',.....], dc = ['field_1',....,'field_...
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What is function overloading and overriding in php?

...that method. In PHP, you can only overload methods using the magic method __call. An example of overriding: <?php class Foo { function myFoo() { return "Foo"; } } class Bar extends Foo { function myFoo() { return "Bar"; } } $foo = new Foo; $bar = new Bar; echo($foo-&...
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Perform commands over ssh with Python

...o.SSHClient() ssh.connect(server, username=username, password=password) ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command(cmd_to_execute) share | improve this answer | fo...
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How can I change Mac OS's default Java VM returned from /usr/libexec/java_home

... I think JAVA_HOME is the best you can do. The command-line tools like java and javac will respect that environment variable, you can use /usr/libexec/java_home -v '1.7*' to give you a suitable value to put into JAVA_HOME in order to mak...
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Tracking Google Analytics Page Views with AngularJS

... set up your tracking code in your main index.html file with a name of var _gaq and MyCtrl is what you've defined in the ng-controller directive. function MyCtrl($scope, $location, $window) { $scope.$on('$viewContentLoaded', function(event) { $window._gaq.push(['_trackPageView', $location.url...