Controlling Line Breaks in Head and Tail Strings

The head and tail strings in a macro block are only generated when necessary. If the block returns nothing then the head and tail strings do not appear, which can help to control the creation of new lines.

Example
The text and new lines in the head and tail of each `.foreach_item` loop are only printed if the collection is not empty. When this template is applied to a class with attributes but no operations, the text `// Operations` and the new lines specified before and after the operations list will not be printed: class "%Code%" { .foreach_item(Attributes, // Attributes\n,\n\n) %DataType% %Code% .if (%InitialValue%) = %InitialValue% .endif .next(\n) .foreach_item(Operations, // Operations\n,\n\n) %ReturnType% %Code%(...) .next(\n) <Source> } Result: class "C1" {// Attributes int a1 = 10 int a2 int a3 = 5 int a4 <Source> } Note: To print a blank space between the curly brace and the string `// Attributes`, you must enclose the head string in double-quotes: .foreach_item(Attributes," // Attributes\n",\n)

Example

The text and new lines in the head and tail of each .foreach_item loop are only printed if the collection is not empty. When this template is applied to a class with attributes but no operations, the text // Operations and the new lines specified before and after the operations list will not be printed:

class "%Code%" {
 .foreach_item(Attributes, // Attributes\n,\n\n)
 %DataType% %Code%
  .if (%InitialValue%)
 = %InitialValue%
  .endif
 .next(\n)
 .foreach_item(Operations, // Operations\n,\n\n)
 %ReturnType% %Code%(...)
 .next(\n)
<Source>
}

Result:

class "C1" {// Attributes
 int a1 = 10
 int a2
 int a3 = 5
 int a4

<Source>
}

Note: To print a blank space between the curly brace and the string // Attributes, you must enclose the head string in double-quotes:

.foreach_item(Attributes," // Attributes\n",\n)