Default values

Lists the default values used in OPL.

Table 1. Default value syntax
Syntax	Effect
`with` (expression) statement	Evaluate `expression`, then execute `statement` with the value of `expression` temporarily installed as the default value. When a reference to an identifier name in `statement` is evaluated, this identifier is first looked up as a property of the default value; if the default value does not have such a property, `name` is treated as a regular variable. For example, the following program displays "The length is 3", because the identifier `length` is taken as the `length` property of the string "abc". with ("abc") { writeln("The length is ", length) } You can nest `with` statements; in this case, references to identifiers are looked up in the successive default values, from the innermost to the outermost `with` statement.