mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
3b9f1bd77f
<rdar://problem/19104060> LLVM's PointerIntPair always picks the highest bits of the available low order free bits but NumLowBitsAvailable is the number of *lowest* bits available from the LSB. This could cause problems with overwriting when putting a FlaggedPointer inside a PointerIntPair. Just don't allow it. Add a static assert to make sure there are enough bits to support the number of nested FlaggedPointers. Add a helper constexpr min function which isn't available until C++14. Swift SVN r23597
30 lines
1.0 KiB
C++
30 lines
1.0 KiB
C++
//===--- Algorithm.h - -------------------------------------------*- C++ -*-==//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See http://swift.org/LICENSE.txt for license information
|
|
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines helper algorithms, some of which are ported from C++14,
|
|
// which may not be available on all platforms yet.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SWIFT_BASIC_ALGORITHM_H
|
|
#define SWIFT_BASIC_ALGORITHM_H
|
|
|
|
namespace swift {
|
|
/// Returns the minimum of `a` and `b`, or `a` if they are equivalent.
|
|
template <typename T>
|
|
constexpr const T& min(const T &a, const T &b) {
|
|
return !(b < a) ? a : b;
|
|
}
|
|
} // namespace swift
|
|
|
|
#endif
|