mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-10 17:07:06 +00:00
1ec9e6a5dc
that a pointer can be null, forcing clients to think about it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109348 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
//===- llvm/ADT/NullablePtr.h - A pointer that allows null ------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines and implements the NullablePtr class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_NULLABLE_PTR_H
|
|
#define LLVM_ADT_NULLABLE_PTR_H
|
|
|
|
#include <cassert>
|
|
#include <cstddef>
|
|
|
|
namespace llvm {
|
|
/// NullablePtr pointer wrapper - NullablePtr is used for APIs where a
|
|
/// potentially-null pointer gets passed around that must be explicitly handled
|
|
/// in lots of places. By putting a wrapper around the null pointer, it makes
|
|
/// it more likely that the null pointer case will be handled correctly.
|
|
template<class T>
|
|
class NullablePtr {
|
|
T *Ptr;
|
|
public:
|
|
NullablePtr(T *P = 0) : Ptr(P) {}
|
|
|
|
bool isNull() const { return Ptr == 0; }
|
|
bool isNonNull() const { return Ptr != 0; }
|
|
|
|
/// get - Return the pointer if it is non-null.
|
|
const T *get() const {
|
|
assert(Ptr && "Pointer wasn't checked for null!");
|
|
return Ptr;
|
|
}
|
|
|
|
/// get - Return the pointer if it is non-null.
|
|
T *get() {
|
|
assert(Ptr && "Pointer wasn't checked for null!");
|
|
return Ptr;
|
|
}
|
|
|
|
T *getPtrOrNull() { return Ptr; }
|
|
const T *getPtrOrNull() const { return Ptr; }
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|