Lustre (programming language)

Structure of Lustre programs

A Lustre program is a series of node definitions, written as:

<span id="mwIA"></span>node foo(a : bool) returns (b : bool); let b = not a; tel

Where foo is the name of the node, a is the name of the single input of this node and b is the name of the single output. In this example the node foo returns the negation of its input a, which is the expected result.

Inner variables

Additional internal variables can be declared as follows:

<span id="mwKw"></span>node Nand(X,Y: bool) returns (Z: bool); var U: bool; let U = X and Y; Z = not U; tel

Note: The equations order doesn't matter, the order of lines U = X and Y; and Z = not U; doesn't change the result.

Special operators