Switch or if/elseif/else inside golang HTML templates
Yes, you can use {{else if .IsMenu}}
templates
Can someone explain this template code that gives me the size of an array? [duplicate]
Well, first you have to understand that trying to get a value out of an array can give you a pointer to its first element: int a[] = {1, 2, 3}; int *ap = a; // a pointer, size is lost int (&ar)[3] = a; // a reference to the array, size is not lost … Read more
Passing a string literal as a type argument to a class template
You can have a const char* non-type template parameter, and pass it a const char[] variable with static linkage, which is not all that far from passing a string literal directly. #include <iostream> template<const char *str> struct cts { void p() {std::cout << str;} }; static const char teststr[] = “Hello world!”; int main() { … Read more
Rendering JSON objects using a Django template after an Ajax call
Hey thanks vikingosegundo! I like using decorators too :-). But in the meanwhile I’ve been following the approach suggested by the snippet I was mentioning above. Only thing, use instead the snippet n. 942 cause it’s an improved version of the original one. Here’s how it works: Imagine you have a template (e.g., ‘subtemplate.html’) of … Read more
Integrate type name in static_assert output?
My Hack Code: template <typename Assertion> struct AssertValue : AssertionChecker<Assertion::value, Assertion> { static_assert(AssertionValue, “Assertion failed <see below for more information>”); static bool const value = Assertion::value; }; It allows for you to check any ::value assertion and dump the types if it failed. Usage: // Bad indentation used to show parts static_assert( AssertValue< std::my_check< T0, … Read more
Declare CSS style outside the “HEAD” element of an “HTML” page?
tl;dr: If you’re not comfortable using HTML features that haven’t reached a maturity level of W3C Recommendation, there isn’t a standard way of adding <style> to the <body> of a page. If you’re comfortable using less mature features, HTML5.2 appears to be standardizing <style> elements to be allowed anywhere flow content is expected (i.e. the … Read more
Django project base template
Sure you can. A quick example of a base.html <!DOCTYPE html> <html> <head> <title>My Project</title> </head> <body> {% block content %}{% endblock content %} </body> </html> And say you have a app called myapp with a view.html page, {% extends “base.html” %} {% block content %} <h2>Content for My App</h2> <p>Stuff etc etc.</p> {% endblock … Read more
.template (dot-template) construction usage [duplicate]
GetValue is a dependent name, and so you need to explicitly tell the compiler that what follows c is a function template, not some member data. That is why you need to write template keyword to disambiguate this. Without template keyword, the following c.GetValue<I>() //without template keyword could be interpreted as: //GetValue is interpreted as … Read more
Is there a difference between universal references and forwarding references?
Do they mean the same thing? Universal reference was a term Scott Meyers coined to describe the concept of taking an rvalue reference to a cv-unqualified template parameter, which can then be deduced as either a value or an lvalue reference. At the time the C++ standard didn’t have a special term for this, which … Read more
void_t “can implement concepts”?
Yes, concepts lite basically dresses up SFINAE. Plus it allows deeper introspection to allow for better overloading. However that only works if the concept predicates are defined as concept bool. The improved overloading does not work with the current concept predicates, but conditional overloading can be used. Lets look how we can define predicates, constrain … Read more