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Undefined parameter values are tricky: if the first positional parameter was not defined in the template call, then {{{1}}} will evaluate to the literal string "{{{1}}}" (i.e., the 7-character string containing three sets of curly braces around the number 1), which is a true value.
Each nested use adds 5 levels to the template expansion depth, so 7 nested if-templates would use 35 levels (5*7) of the 41-level limit. Using P-if syntax: A similar if-structure can be coded without Template:If, by using the {} and {} templates in a "P-if" structure. Template:P1 always returns parameter 1, and P2 returns the 2nd. So, a ...
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Each nested use adds 5 levels to the template expansion depth, so 7 nested if-templates would use 35 levels (5*7) of the 41-level limit. Using P-if syntax: A similar if-structure can be coded without Template:If, by using the {} and {} templates in a "P-if" structure. Template:P1 always returns parameter 1, and P2 returns the 2nd. So, a ...
Templates used for "if-then-else" (i.e. conditional) types of queries within Wikipedia code. Take care! These templates can be tricky to manipulate and can produce unexpected results, especially if their use is introduced or amended without testing.
For evaluating the condition (determining non-emptiness of the first parameter) the template uses parser function #if, producing 1 if the condition is true, and 2 otherwise. The template with name equal to "P" followed by the index value produced (hence Template:P1 or Template:P2), is called with as parameters A and B. This produces either A or ...
Generics, or parameterized types, or parametric polymorphism is a .NET 2.0 feature supported by C# and Visual Basic. Unlike C++ templates, .NET parameterized types are instantiated at runtime rather than by the compiler; hence they can be cross-language whereas C++ templates cannot.
It is a separator between statements, not a terminator. ^d END-IF may be used instead of the period at the end. ^e In Rust, the comma ( , ) at the end of a match arm can be omitted after the last match arm, or after any match arm in which the expression is a block (ends in possibly empty matching brackets {} ).