You should only use extern template to force the compiler to not instantiate a template when you know that it will be instantiated somewhere else. It is used to reduce compile time and object file size. For example: // header.h template<typename T> void ReallyBigFunction() { // Body } // source1.cpp #include “header.h” void something1() { … Read more
1. Primary Class Template When you write has_member<A>::value, the compiler looks up the name has_member and finds the primary class template, that is, this declaration: template< class , class = void > struct has_member; (In the OP, that’s written as a definition.) The template argument list <A> is compared to the template parameter list of … Read more
In addition to Andrzej Bobak’s answer, you can also generate a global variable in Javascript from your template. For example, your template might generate code like this: <script> var my_chart = {{ the_chart }}; </script> Your script could then refer to my_chart.
I ended up modifying @thikonom ‘s answer to use class-based views: class IndexView(ListView): context_object_name=”home_list” template_name=”contacts/index.html” queryset = Individual.objects.all() def get_context_data(self, **kwargs): context = super(IndexView, self).get_context_data(**kwargs) context[‘roles’] = Role.objects.all() context[‘venue_list’] = Venue.objects.all() context[‘festival_list’] = Festival.objects.all() # And so on for more models return context and in my urls.py url(r’^$’, IndexView.as_view(), name=”home_list” ),
You could use typeid: if (typeid(T) == typeid(int)) Or you could use the std::is_same type trait: if (std::is_same<T, int>::value)
In list<tNode<T>*>::iterator, you have a dependant name, that is, a name that depends on a template parameter. As such, the compiler can’t inspect list<tNode<T>*> (it doesn’t have its definition at this point) and so it doesn’t know whether list<tNode<T>*>::iterator is either a static field or a type. In such a situation, the compiler assumes that … Read more
You can use the std::is_arithmetic type trait. If you want to only enable instantiation of a class with such a type, use it in conjunction with std::enable_if: #include <type_traits> template< typename T, //real type typename = typename std::enable_if<std::is_arithmetic<T>::value, T>::type > struct S{}; int main() { S<int> s; //compiles S<char*> s; //doesn’t compile } For a … Read more
Use jQuery and the .load() ( http://api.jquery.com/load/ ) method to inject the loaded document into the DOM. $(function() { $(‘#content’).load(‘/templates.html’); });
template<> tells the compiler that a template specialization follows, specifically a full specialization. Normally, class A would have to look something like this: template<class T> class A{ // general implementation }; template<> class A<int>{ // special implementation for ints }; Now, whenever A<int> is used, the specialized version is used. You can also use it … Read more
For a simple solution, use OpenStruct: require ‘erb’ require ‘ostruct’ namespace = OpenStruct.new(name: ‘Joan’, last: ‘Maragall’) template=”Name: <%= name %> <%= last %>” result = ERB.new(template).result(namespace.instance_eval { binding }) #=> Name: Joan Maragall The code above is simple enough but has (at least) two problems: 1) Since it relies on OpenStruct, an access to a … Read more