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52 lines
1.5 KiB
52 lines
1.5 KiB
//===- llvm/ADT/NullablePtr.h - A pointer that allows null ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines and implements the NullablePtr class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_NULLABLEPTR_H
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#define LLVM_ADT_NULLABLEPTR_H
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#include <cassert>
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#include <cstddef>
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namespace llvm {
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/// NullablePtr pointer wrapper - NullablePtr is used for APIs where a
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/// potentially-null pointer gets passed around that must be explicitly handled
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/// in lots of places. By putting a wrapper around the null pointer, it makes
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/// it more likely that the null pointer case will be handled correctly.
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template<class T>
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class NullablePtr {
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T *Ptr;
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public:
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NullablePtr(T *P = 0) : Ptr(P) {}
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bool isNull() const { return Ptr == 0; }
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bool isNonNull() const { return Ptr != 0; }
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/// get - Return the pointer if it is non-null.
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const T *get() const {
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assert(Ptr && "Pointer wasn't checked for null!");
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return Ptr;
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}
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/// get - Return the pointer if it is non-null.
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T *get() {
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assert(Ptr && "Pointer wasn't checked for null!");
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return Ptr;
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}
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T *getPtrOrNull() { return Ptr; }
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const T *getPtrOrNull() const { return Ptr; }
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};
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} // end namespace llvm
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#endif
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