mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-17 21:29:20 +00:00
add new smart pointer for clang.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45261 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
f6cb6eeb5a
commit
714307207f
79
include/llvm/ADT/OwningPtr.h
Normal file
79
include/llvm/ADT/OwningPtr.h
Normal file
@ -0,0 +1,79 @@
|
|||||||
|
//===- llvm/ADT/OwningPtr.h - Smart ptr that owns the pointee ---*- C++ -*-===//
|
||||||
|
//
|
||||||
|
// The LLVM Compiler Infrastructure
|
||||||
|
//
|
||||||
|
// This file was developed by Chris Lattner and is distributed under the
|
||||||
|
// University of Illinois Open Source License. See LICENSE.TXT for details.
|
||||||
|
//
|
||||||
|
//===----------------------------------------------------------------------===//
|
||||||
|
//
|
||||||
|
// This file defines and implements the OwningPtr class.
|
||||||
|
//
|
||||||
|
//===----------------------------------------------------------------------===//
|
||||||
|
|
||||||
|
#ifndef LLVM_ADT_OWNING_PTR_H
|
||||||
|
#define LLVM_ADT_OWNING_PTR_H
|
||||||
|
|
||||||
|
#include <cassert>
|
||||||
|
|
||||||
|
namespace llvm {
|
||||||
|
|
||||||
|
/// OwningPtr smart pointer - OwningPtr mimics a built-in pointer except that it
|
||||||
|
/// guarantees deletion of the object pointed to, either on destruction of the
|
||||||
|
/// OwningPtr or via an explicit reset(). Once created, ownership of the
|
||||||
|
/// pointee object can be taken away from OwningPtr by using the take method.
|
||||||
|
template<class T>
|
||||||
|
class OwningPtr {
|
||||||
|
OwningPtr(OwningPtr const &); // DO NOT IMPLEMENT
|
||||||
|
OwningPtr &operator=(OwningPtr const &); // DO NOT IMPLEMENT
|
||||||
|
T *Ptr;
|
||||||
|
public:
|
||||||
|
explicit OwningPtr(T *P = 0) : Ptr(P) {}
|
||||||
|
|
||||||
|
~OwningPtr() {
|
||||||
|
delete Ptr;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// reset - Change the current pointee to the specified pointer. Note that
|
||||||
|
/// calling this with any pointer (including a null pointer) deletes the
|
||||||
|
/// current pointer.
|
||||||
|
void reset(T *P = 0) {
|
||||||
|
if (P == Ptr) return;
|
||||||
|
T *Tmp = Ptr;
|
||||||
|
Ptr = P;
|
||||||
|
delete Tmp;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// take - Reset the owning pointer to null and return its pointer. This does
|
||||||
|
/// not delete the pointer before returning it.
|
||||||
|
T *take() {
|
||||||
|
T *Tmp = Ptr;
|
||||||
|
Ptr = 0;
|
||||||
|
return Tmp;
|
||||||
|
}
|
||||||
|
|
||||||
|
T &operator*() const {
|
||||||
|
assert(Ptr && "Cannot dereference null pointer");
|
||||||
|
return *Ptr;
|
||||||
|
}
|
||||||
|
|
||||||
|
T *operator->() const { return Ptr; }
|
||||||
|
T *get() const { return Ptr; }
|
||||||
|
operator bool() const { return Ptr != 0; }
|
||||||
|
bool operator!() const { return Ptr == 0; }
|
||||||
|
|
||||||
|
void swap(OwningPtr &RHS) {
|
||||||
|
T *Tmp = RHS.Ptr;
|
||||||
|
RHS.Ptr = Ptr;
|
||||||
|
Ptr = Tmp;
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
template<class T>
|
||||||
|
inline void swap(OwningPtr<T> &a, OwningPtr<T> &b) {
|
||||||
|
a.swap(b);
|
||||||
|
}
|
||||||
|
|
||||||
|
} // end namespace llvm
|
||||||
|
|
||||||
|
#endif
|
Loading…
Reference in New Issue
Block a user