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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//===-- llvm/ADT/SetOperations.h - Generic Set Operations -------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines generic set operations that may be used on set's of
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// different types, and different element types.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_SETOPERATIONS_H
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#define LLVM_ADT_SETOPERATIONS_H
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namespace llvm {
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/// set_union(A, B) - Compute A := A u B, return whether A changed.
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///
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template <class S1Ty, class S2Ty>
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bool set_union(S1Ty &S1, const S2Ty &S2) {
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bool Changed = false;
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for (typename S2Ty::const_iterator SI = S2.begin(), SE = S2.end();
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SI != SE; ++SI)
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if (S1.insert(*SI).second)
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Changed = true;
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return Changed;
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}
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/// set_intersect(A, B) - Compute A := A ^ B
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/// Identical to set_intersection, except that it works on set<>'s and
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/// is nicer to use. Functionally, this iterates through S1, removing
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/// elements that are not contained in S2.
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///
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template <class S1Ty, class S2Ty>
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void set_intersect(S1Ty &S1, const S2Ty &S2) {
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for (typename S1Ty::iterator I = S1.begin(); I != S1.end();) {
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const auto &E = *I;
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++I;
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if (!S2.count(E)) S1.erase(E); // Erase element if not in S2
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}
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}
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/// set_difference(A, B) - Return A - B
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///
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template <class S1Ty, class S2Ty>
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S1Ty set_difference(const S1Ty &S1, const S2Ty &S2) {
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S1Ty Result;
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for (typename S1Ty::const_iterator SI = S1.begin(), SE = S1.end();
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SI != SE; ++SI)
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if (!S2.count(*SI)) // if the element is not in set2
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Result.insert(*SI);
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return Result;
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}
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/// set_subtract(A, B) - Compute A := A - B
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///
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template <class S1Ty, class S2Ty>
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void set_subtract(S1Ty &S1, const S2Ty &S2) {
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for (typename S2Ty::const_iterator SI = S2.begin(), SE = S2.end();
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SI != SE; ++SI)
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S1.erase(*SI);
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}
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} // End llvm namespace
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#endif
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