llvm/llvm/include/llvm/ADT/DeltaAlgorithm.h

//===- DeltaAlgorithm.h - A Set Minimization Algorithm ---------*- C++ -*--===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_DELTAALGORITHM_H
#define LLVM_ADT_DELTAALGORITHM_H

#include <set>
#include <vector>

namespace llvm {

/// DeltaAlgorithm - Implements the delta debugging algorithm (A. Zeller '99)
/// for minimizing arbitrary sets using a predicate function.
///
/// The result of the algorithm is a subset of the input change set which is
/// guaranteed to satisfy the predicate, assuming that the input set did. For
/// well formed predicates, the result set is guaranteed to be such that
/// removing any single element would falsify the predicate.
///
/// For best results the predicate function *should* (but need not) satisfy
/// certain properties, in particular:
///  (1) The predicate should return false on an empty set and true on the full
///  set.
///  (2) If the predicate returns true for a set of changes, it should return
///  true for all supersets of that set.
///
/// It is not an error to provide a predicate that does not satisfy these
/// requirements, and the algorithm will generally produce reasonable
/// results. However, it may run substantially more tests than with a good
/// predicate.
class DeltaAlgorithm { … };

} // end namespace llvm

#endif // LLVM_ADT_DELTAALGORITHM_H