/usr/include/llvm-3.3/llvm/ADT/NullablePtr.h is in llvm-3.3-dev 1:3.3-16ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | //===- 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_NULLABLEPTR_H
#define LLVM_ADT_NULLABLEPTR_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
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