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
The problem you describe can be solved by defining the template in the header, or via the approach you describe above. I recommend reading the following points from the C++ FAQ Lite: Why can’t I separate the definition of my templates class from its declaration and put it inside a .cpp file? How can I … Read more
You must create your template files in the correct location; in the templates subdirectory next to the python module (== the module where you create your Flask app). The error indicates that there is no home.html file in the templates/ directory. Make sure you created that directory in the same directory as your python module, … Read more
In short, CRTP is when a class A has a base class which is a template specialization for the class A itself. E.g. template <class T> class X{…}; class A : public X<A> {…}; It is curiously recurring, isn’t it? 🙂 Now, what does this give you? This actually gives the X template the ability … Read more
Short answer: in order to make x a dependent name, so that lookup is deferred until the template parameter is known. Long answer: when a compiler sees a template, it is supposed to perform certain checks immediately, without seeing the template parameter. Others are deferred until the parameter is known. It’s called two-phase compilation, and … Read more
Templated check for the existence of a class member function?
(See here also for my C++11 answer) In order to parse a C++ program, the compiler needs to know whether certain names are types or not. The following example demonstrates that: t * f; How should this be parsed? For many languages a compiler doesn’t need to know the meaning of a name in order … Read more
Caveat: It is not necessary to put the implementation in the header file, see the alternative solution at the end of this answer. Anyway, the reason your code is failing is that, when instantiating a template, the compiler creates a new class with the given template argument. For example: template<typename T> struct Foo { T … Read more