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For example, the template base class in the Factorial example below is implemented by matching 0 rather than with an inequality test, which was previously unavailable. However, the arrival in C++11 of standard library features such as std::conditional has provided another, more flexible way to handle conditional template instantiation.
If the template has a separate documentation page (usually called "Template:template name/doc"), add [[Category:If-then-else templates]] to the <includeonly> section at the bottom of that page.
Templates in D use a different syntax than in C++: whereas in C++ template parameters are wrapped in angular brackets (Template<param1, param2>), D uses an exclamation sign and parentheses: Template!(param1, param2). This avoids the C++ parsing difficulties due to ambiguity with comparison operators. If there is only one parameter, the ...
This page in a nutshell: Scribbling is a way to create complex templates and is more robust than parser functions. A scribbled template consists of only {{#invoke:Name1|Name2}}, which invokes the script at Module:Name1, where the code is written. To get started, refer to Module:Example.
The template can be repeatedly nested 6 or 7 levels, one inside the other, because the outer-most is completed before running either the then/else inner levels. This template can be substituted, when the expression or comparison will not change.
This module implements {{Parameter names example}} (also known as {{Generic template demo}}). It creates a template demonstration such as that shown opposite. Please see the template page for full documentation.
When writing a wrapper template, give this module all of the normally required default parameters necessary to use the wrapper template in its base form. Editors then use the wrapper template as-is or may supply additional wrapper and canonical parameters.
This template also has undefined behaviour, if any parameter (be it named or unnamed) that is different from test, then or else is defined when calling the template. Note that {{ qif }} does not work when subst'ed (like {{ ifndef }} , the then part alone as in {{ ifdef }} can be substituted).