What you need to do is have the preprocessor generate reflection data about the fields. This data can be stored as nested classes. First, to make it easier and cleaner to write it in the preprocessor we will use typed expression. A typed expression is just an expression that puts the type in parenthesis. So … Read more
As skaffman suggested, JSP 2.0 Tag Files are the bee’s knees. Let’s take your simple example. Put the following in WEB-INF/tags/wrapper.tag <%@tag description=”Simple Wrapper Tag” pageEncoding=”UTF-8″%> <html><body> <jsp:doBody/> </body></html> Now in your example.jsp page: <%@page contentType=”text/html” pageEncoding=”UTF-8″%> <%@taglib prefix=”t” tagdir=”/WEB-INF/tags” %> <t:wrapper> <h1>Welcome</h1> </t:wrapper> That does exactly what you think it does. So, lets expand … Read more
{{ }} tells the template to print the value, this won’t work in expressions like you’re trying to do. Instead, use the {% set %} template tag and then assign the value the same way you would in normal python code. {% set testing = ‘it worked’ %} {% set another = testing %} {{ … Read more
Templates are all about the compiler generating code at compile-time. Virtual functions are all about the run-time system figuring out which function to call at run-time. Once the run-time system figured out it would need to call a templatized virtual function, compilation is all done and the compiler cannot generate the appropriate instance anymore. Therefore … Read more
<% %> Executes the ruby code within the brackets. <%= %> Prints something into erb file. <%== %> Equivalent to <%= raw %>. Prints something verbatim (i.e. w/o escaping) into erb file. (Taken from Ruby on Rails Guides.) <% -%> Avoids line break after expression. <%# %> Comments out code within brackets; not sent to … Read more
I just discovered a nice way to set your page title if you’re using routing: JavaScript: var myApp = angular.module(‘myApp’, [‘ngResource’]) myApp.config( [‘$routeProvider’, function($routeProvider) { $routeProvider.when(“https://stackoverflow.com/”, { title: ‘Home’, templateUrl: ‘/Assets/Views/Home.html’, controller: ‘HomeController’ }); $routeProvider.when(‘/Product/:id’, { title: ‘Product’, templateUrl: ‘/Assets/Views/Product.html’, controller: ‘ProductController’ }); }]); myApp.run([‘$rootScope’, function($rootScope) { $rootScope.$on(‘$routeChangeSuccess’, function (event, current, previous) { $rootScope.title = … Read more
C++11 added alias declarations, which are generalization of typedef, allowing templates: template <size_t N> using Vector = Matrix<N, 1>; The type Vector<3> is equivalent to Matrix<3, 1>. In C++03, the closest approximation was: template <size_t N> struct Vector { typedef Matrix<N, 1> type; }; Here, the type Vector<3>::type is equivalent to Matrix<3, 1>.
Those script tags are a common way to implement templating functionality (like in PHP) but on the client side. By setting the type to “text/template”, it’s not a script that the browser can understand, and so the browser will simply ignore it. This allows you to put anything in there, which can then be extracted … Read more
The following code templates will both create a logger and create the right imports, if needed. SLF4J ${:import(org.slf4j.Logger,org.slf4j.LoggerFactory)} private static final Logger LOG = LoggerFactory.getLogger(${enclosing_type}.class); Log4J 2 ${:import(org.apache.logging.log4j.LogManager,org.apache.logging.log4j.Logger)} private static final Logger LOG = LogManager.getLogger(${enclosing_type}.class); Log4J ${:import(org.apache.log4j.Logger)} private static final Logger LOG = Logger.getLogger(${enclosing_type}.class); Source. JUL ${:import(java.util.logging.Logger)} private static final Logger LOG = Logger.getLogger(${enclosing_type}.class.getName());
Yes, with SFINAE you can check if a given class does provide a certain method. Here’s the working code: #include <iostream> struct Hello { int helloworld() { return 0; } }; struct Generic {}; // SFINAE test template <typename T> class has_helloworld { typedef char one; struct two { char x[2]; }; template <typename C> … Read more