#lang scribble/manual
@(require (for-label racket))

@title{UnaryOpFunction}
represent a unary operation on a function@section{related}
  Classes/UnaryOpStream, Classes/Punop, Classes/BinaryOpFunction, Classes/NAryOpFunction, Overviews/Operators
@section{categories}
 Core

@section{description}

Operating on functions instead of numbers, what results is not a result of the calculation, but a structure that represents that calculation.

@section{examples}
 


@racketblock[
a = 2.sqrt; // result is square root of two (approximate floating point).
a = { b }.sqrt; // result is  a UnaryOpFunction
b = 2;
a.value; // now it is evaluated, and the result is calculated
b = 9;
a.value; // again, with a different value.
::

]

@racketblock[
// sound example
(
var a = { 19.rand };
var b = a.sqrt;
fork {
	15.do {
		(instrument: \default, note: [a.value, b.value]).play;
		0.3.wait;
	}
}
)
::
]