Turns out all I needed to do was wrap the left-hand side of the expression in soft brackets: <span class=”gallery-date”>{{(gallery.date | date:’mediumDate’) || “Various”}}</span>
This typically is unwarranted in C++, as other answers here have noted. In C++ we tend to define generic types based on other constraints other than “inherits from this class”. If you really wanted to do that, it’s quite easy to do in C++11 and <type_traits>: #include <type_traits> template<typename T> class observable_list { static_assert(std::is_base_of<list, T>::value, … Read more
This is a common question in C++ programming. There are two valid answers to this. There are advantages and disadvantages to both answers and your choice will depend on context. The common answer is to put all the implementation in the header file, but there’s another approach will will be suitable in some cases. The … Read more
To check if the value exists: [#if userName??] Hi ${userName}, How are you? [/#if] Or with the standard freemarker syntax: <#if userName??> Hi ${userName}, How are you? </#if> To check if the value exists and is not empty: <#if userName?has_content> Hi ${userName}, How are you? </#if>
It makes sense to give default template arguments. For example you could create a sort function: template<typename Iterator, typename Comp = std::less< typename std::iterator_traits<Iterator>::value_type> > void sort(Iterator beg, Iterator end, Comp c = Comp()) { … } C++0x introduces them to C++. See this defect report by Bjarne Stroustrup: Default Template Arguments for Function Templates … Read more
Note: Foo me; without template arguments is legal as of C++17. See this answer: https://stackoverflow.com/a/50970942/539997. Original answer applicable before C++17: You have to do: Foo<> me; The template arguments must be present but you can leave them empty. Think of it like a function foo with a single default argument. The expression foo won’t call … Read more
I’ll add my voice to the noise and take a stab at making things clear: C# Generics allow you to declare something like this. List<Person> foo = new List<Person>(); and then the compiler will prevent you from putting things that aren’t Person into the list. Behind the scenes the C# compiler is just putting List<Person> … Read more
Check out Rick Strahl’s post Client Templating with jQuery. He explores jTemplates, but then makes a better case for John Resig’s micro-templating solution, even improving it some. Good comparisons, lots of samples.
Try <option value=”{{id}}”>{{title}} {{../externalValue}}</option> The ../ path segment references the parent template scope that should be what you want.
The short answer is “because C++ has moved on”. Yes, back in the late 70’s, Stroustrup intended to create an upgraded C with OOP capabilities, but that is a long time ago. By the time the language was standardized in 1998, it was no longer an OOP language. It was a multi-paradigm language. It certainly … Read more