friend declaration declares a non-template function [duplicate]
It sounds like you want to change: friend ostream& operator << (ostream& out, const Base<T>& e); To: template<class T> friend ostream& operator << (ostream& out, const Base<T>& e);
templates
Template Metaprogramming – Difference Between Using Enum Hack and Static Const
Enums aren’t lvals, static member values are and if passed by reference the template will be instanciated: void f(const int&); f(TMPFib<1>::value); If you want to do pure compile time calculations etc. this is an undesired side-effect. The main historic difference is that enums also work for compilers where in-class-initialization of member values is not supported, … Read more
Is there a way to pass variables into templates in Meteor?
All of the previous answers are overkill or outdated. Here’s how you can pass static parameters into templates, directly from HTML+Spacebars code, as of Meteor 0.8.x: <div class=”slot-wrapper”> {{> slot number=”1″}} {{> slot number=”2″}} … </div> <template name=”slot”> <div class=”number”><span>{{number}}</span></div> </template> All you have to do is pass key=”value” parameters in the {{> template}} inclusion … Read more
Default template argument and partial specialization
The default argument applies to the specialization — and, in fact, a specialization must accept (so to speak) the base template’s default argument(s). Attempting to specify a default in the specialization: template<class A = int, class B=double> class Base {}; template<class B=char> // … …is an error. Likewise, if we change the specialization so that … Read more
Template function inside template class
Write this: template <class T> template <class U> void MyClass<T>::foo() { /* … */ }
How to create a template function within a class? (C++)
Your guess is the correct one. The only thing you have to remember is that the member function template definition (in addition to the declaration) should be in the header file, not the cpp, though it does not have to be in the body of the class declaration itself.
When instantiating a template, should members of its incomplete argument types be visible?
Whether typename T::Before is valid is not explicitly said by the spec. It is subject of a defect report (because the Standard can very reasonably be read to forbid it): http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#287 . Whether typename T::After is invalid can also very reasonably be read to be true by the spec, and actually it makes quite a … Read more
WPF: How to customize SelectionBoxItem in ComboBox
I would do it like this: <Window.Resources> <DataTemplate x:Key=”NormalItemTemplate” …> … </DataTemplate> <DataTemplate x:Key=”SelectionBoxTemplate” …> … </DataTemplate> <DataTemplate x:Key=”CombinedTemplate”> <ContentPresenter x:Name=”Presenter” Content=”{Binding}” ContentTemplate=”{StaticResource NormalItemTemplate}” /> <DataTemplate.Triggers> <DataTrigger Binding=”{Binding RelativeSource={RelativeSource FindAncestor,ComboBoxItem,1}}” Value=”{x:Null}”> <Setter TargetName=”Presenter” Property=”ContentTemplate” Value=”{StaticResource SelectionBoxTemplate}” /> </DataTrigger> </DataTemplate.Triggers> </DataTemplate> </Window.Resources> … <ComboBox ItemTemplate=”{StaticResource CombinedTemplate}” ItemsSource=”…” … /> The reason this works is that CombinedTemplate … Read more
Why can I call base template class method from derived class
template <class T> struct A { void f(){} }; template <class T> struct B : public A <T> { void f2() { f(); } // calling base function – will not compile }; In the derived template, the expression f() is not dependent on any template argument, so the compiler attempts to resolve it during … Read more
Golang template engine pipelines
There are 2 template packages, text/template and html/template. They have the same interface, but the html/template package is for generating HTML output safe against code injection, and should be used instead of text/template whenever the output is HTML. Since they have the same interface but the html/template provides some extra functionality (contextual escaping of the … Read more