// CookieJar - A contestant's algorithm toolbox
// Copyright (c) 2014 Peter Szilagyi. All rights reserved.
//
// CookieJar is dual licensed: use of this source code is governed by a BSD
// license that can be found in the LICENSE file. Alternatively, the CookieJar
// toolbox may be used in accordance with the terms and conditions contained
// in a signed written agreement between you and the author(s).

package utility

// Generic curve function type. Input is automatically normalized to [0, 1]
// prior to passing it to the curve. Outputs is clamped to [0, 1].
type Curve func(float64) float64

// Generic curve function combinator. Input is guaranteed to be in [0, 1].
// Outputs is clamped to [0, 1].
type Combinator func(x, y float64) float64

type utility interface {
	Dependency(util utility)
}

type singleUtility interface {
	utility
	Evaluate() float64
}

type multiUtility interface {
	utility
	Member(id int) singleUtility
	Evaluate(id int) float64
}