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app/PublicUtility/CAAutoDisposer.h Normal file
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/*
File: CAAutoDisposer.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Inc. ("Apple") in consideration of your agreement to the following
terms, and your use, installation, modification or redistribution of
this Apple software constitutes acceptance of these terms. If you do
not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
implied, are granted by Apple herein, including but not limited to any
patent rights that may be infringed by your derivative works or by other
works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
#if !defined(__CAPtr_h__)
#define __CAPtr_h__
#include <stdlib.h> // for malloc
#include <new> // for bad_alloc
#include <string.h> // for memset
inline void* CA_malloc(size_t size)
{
void* p = malloc(size);
if (!p && size) throw std::bad_alloc();
return p;
}
inline void* CA_realloc(void* old, size_t size)
{
#if TARGET_OS_WIN32
void* p = realloc(old, size);
#else
void* p = reallocf(old, size); // reallocf ensures the old pointer is freed if memory is full (p is NULL).
#endif
if (!p && size) throw std::bad_alloc();
return p;
}
#ifndef UINTPTR_MAX
#if __LP64__
#define UINTPTR_MAX 18446744073709551615ULL
#else
#define UINTPTR_MAX 4294967295U
#endif
#endif
inline void* CA_calloc(size_t n, size_t size)
{
// ensure that multiplication will not overflow
if (n && UINTPTR_MAX / n < size) throw std::bad_alloc();
size_t nsize = n*size;
void* p = malloc(nsize);
if (!p && nsize) throw std::bad_alloc();
memset(p, 0, nsize);
return p;
}
// helper class for automatic conversions
template <typename T>
struct CAPtrRef
{
T* ptr_;
explicit CAPtrRef(T* ptr) : ptr_(ptr) {}
};
template <typename T>
class CAAutoFree
{
private:
T* ptr_;
public:
CAAutoFree() : ptr_(0) {}
explicit CAAutoFree(T* ptr) : ptr_(ptr) {}
template<typename U>
CAAutoFree(CAAutoFree<U>& that) : ptr_(that.release()) {} // take ownership
// C++ std says: a template constructor is never a copy constructor
CAAutoFree(CAAutoFree<T>& that) : ptr_(that.release()) {} // take ownership
CAAutoFree(size_t n, bool clear = false)
// this becomes an ambiguous call if n == 0
: ptr_(0)
{
size_t maxItems = ~size_t(0) / sizeof(T);
if (n > maxItems)
throw std::bad_alloc();
ptr_ = static_cast<T*>(clear ? CA_calloc(n, sizeof(T)) : CA_malloc(n * sizeof(T)));
}
~CAAutoFree() { free(); }
void alloc(size_t numItems, bool clear = false)
{
size_t maxItems = ~size_t(0) / sizeof(T);
if (numItems > maxItems) throw std::bad_alloc();
free();
ptr_ = static_cast<T*>(clear ? CA_calloc(numItems, sizeof(T)) : CA_malloc(numItems * sizeof(T)));
}
void allocBytes(size_t numBytes, bool clear = false)
{
free();
ptr_ = static_cast<T*>(clear ? CA_calloc(1, numBytes) : CA_malloc(numBytes));
}
void reallocBytes(size_t numBytes)
{
ptr_ = static_cast<T*>(CA_realloc(ptr_, numBytes));
}
void reallocItems(size_t numItems)
{
size_t maxItems = ~size_t(0) / sizeof(T);
if (numItems > maxItems) throw std::bad_alloc();
ptr_ = static_cast<T*>(CA_realloc(ptr_, numItems * sizeof(T)));
}
template <typename U>
CAAutoFree& operator=(CAAutoFree<U>& that)
{
set(that.release()); // take ownership
return *this;
}
CAAutoFree& operator=(CAAutoFree& that)
{
set(that.release()); // take ownership
return *this;
}
CAAutoFree& operator=(T* ptr)
{
set(ptr);
return *this;
}
template <typename U>
CAAutoFree& operator=(U* ptr)
{
set(ptr);
return *this;
}
T& operator*() const { return *ptr_; }
T* operator->() const { return ptr_; }
T* operator()() const { return ptr_; }
T* get() const { return ptr_; }
operator T*() const { return ptr_; }
bool operator==(CAAutoFree const& that) const { return ptr_ == that.ptr_; }
bool operator!=(CAAutoFree const& that) const { return ptr_ != that.ptr_; }
bool operator==(T* ptr) const { return ptr_ == ptr; }
bool operator!=(T* ptr) const { return ptr_ != ptr; }
T* release()
{
// release ownership
T* result = ptr_;
ptr_ = 0;
return result;
}
void set(T* ptr)
{
if (ptr != ptr_)
{
::free(ptr_);
ptr_ = ptr;
}
}
void free()
{
set(0);
}
// automatic conversions to allow assignment from results of functions.
// hard to explain. see auto_ptr implementation and/or Josuttis' STL book.
CAAutoFree(CAPtrRef<T> ref) : ptr_(ref.ptr_) { }
CAAutoFree& operator=(CAPtrRef<T> ref)
{
set(ref.ptr_);
return *this;
}
template<typename U>
operator CAPtrRef<U>()
{ return CAPtrRef<U>(release()); }
template<typename U>
operator CAAutoFree<U>()
{ return CAAutoFree<U>(release()); }
};
template <typename T>
class CAAutoDelete
{
private:
T* ptr_;
public:
CAAutoDelete() : ptr_(0) {}
explicit CAAutoDelete(T* ptr) : ptr_(ptr) {}
template<typename U>
CAAutoDelete(CAAutoDelete<U>& that) : ptr_(that.release()) {} // take ownership
// C++ std says: a template constructor is never a copy constructor
CAAutoDelete(CAAutoDelete<T>& that) : ptr_(that.release()) {} // take ownership
~CAAutoDelete() { free(); }
template <typename U>
CAAutoDelete& operator=(CAAutoDelete<U>& that)
{
set(that.release()); // take ownership
return *this;
}
CAAutoDelete& operator=(CAAutoDelete& that)
{
set(that.release()); // take ownership
return *this;
}
CAAutoDelete& operator=(T* ptr)
{
set(ptr);
return *this;
}
template <typename U>
CAAutoDelete& operator=(U* ptr)
{
set(ptr);
return *this;
}
T& operator*() const { return *ptr_; }
T* operator->() const { return ptr_; }
T* operator()() const { return ptr_; }
T* get() const { return ptr_; }
operator T*() const { return ptr_; }
bool operator==(CAAutoDelete const& that) const { return ptr_ == that.ptr_; }
bool operator!=(CAAutoDelete const& that) const { return ptr_ != that.ptr_; }
bool operator==(T* ptr) const { return ptr_ == ptr; }
bool operator!=(T* ptr) const { return ptr_ != ptr; }
T* release()
{
// release ownership
T* result = ptr_;
ptr_ = 0;
return result;
}
void set(T* ptr)
{
if (ptr != ptr_)
{
delete ptr_;
ptr_ = ptr;
}
}
void free()
{
set(0);
}
// automatic conversions to allow assignment from results of functions.
// hard to explain. see auto_ptr implementation and/or Josuttis' STL book.
CAAutoDelete(CAPtrRef<T> ref) : ptr_(ref.ptr_) { }
CAAutoDelete& operator=(CAPtrRef<T> ref)
{
set(ref.ptr_);
return *this;
}
template<typename U>
operator CAPtrRef<U>()
{ return CAPtrRef<U>(release()); }
template<typename U>
operator CAAutoFree<U>()
{ return CAAutoFree<U>(release()); }
};
template <typename T>
class CAAutoArrayDelete
{
private:
T* ptr_;
public:
CAAutoArrayDelete() : ptr_(0) {}
explicit CAAutoArrayDelete(T* ptr) : ptr_(ptr) {}
template<typename U>
CAAutoArrayDelete(CAAutoArrayDelete<U>& that) : ptr_(that.release()) {} // take ownership
// C++ std says: a template constructor is never a copy constructor
CAAutoArrayDelete(CAAutoArrayDelete<T>& that) : ptr_(that.release()) {} // take ownership
// this becomes an ambiguous call if n == 0
CAAutoArrayDelete(size_t n) : ptr_(new T[n]) {}
~CAAutoArrayDelete() { free(); }
void alloc(size_t numItems)
{
free();
ptr_ = new T [numItems];
}
template <typename U>
CAAutoArrayDelete& operator=(CAAutoArrayDelete<U>& that)
{
set(that.release()); // take ownership
return *this;
}
CAAutoArrayDelete& operator=(CAAutoArrayDelete& that)
{
set(that.release()); // take ownership
return *this;
}
CAAutoArrayDelete& operator=(T* ptr)
{
set(ptr);
return *this;
}
template <typename U>
CAAutoArrayDelete& operator=(U* ptr)
{
set(ptr);
return *this;
}
T& operator*() const { return *ptr_; }
T* operator->() const { return ptr_; }
T* operator()() const { return ptr_; }
T* get() const { return ptr_; }
operator T*() const { return ptr_; }
bool operator==(CAAutoArrayDelete const& that) const { return ptr_ == that.ptr_; }
bool operator!=(CAAutoArrayDelete const& that) const { return ptr_ != that.ptr_; }
bool operator==(T* ptr) const { return ptr_ == ptr; }
bool operator!=(T* ptr) const { return ptr_ != ptr; }
T* release()
{
// release ownership
T* result = ptr_;
ptr_ = 0;
return result;
}
void set(T* ptr)
{
if (ptr != ptr_)
{
delete [] ptr_;
ptr_ = ptr;
}
}
void free()
{
set(0);
}
// automatic conversions to allow assignment from results of functions.
// hard to explain. see auto_ptr implementation and/or Josuttis' STL book.
CAAutoArrayDelete(CAPtrRef<T> ref) : ptr_(ref.ptr_) { }
CAAutoArrayDelete& operator=(CAPtrRef<T> ref)
{
set(ref.ptr_);
return *this;
}
template<typename U>
operator CAPtrRef<U>()
{ return CAPtrRef<U>(release()); }
template<typename U>
operator CAAutoArrayDelete<U>()
{ return CAAutoFree<U>(release()); }
};
// convenience function
template <typename T>
void free(CAAutoFree<T>& p)
{
p.free();
}
////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////
#if 0
// example program showing ownership transfer
CAAutoFree<char> source()
{
// source allocates and returns ownership to the caller.
const char* str = "this is a test";
size_t size = strlen(str) + 1;
CAAutoFree<char> captr(size, false);
strlcpy(captr(), str, size);
printf("source %08X %08X '%s'\n", &captr, captr(), captr());
return captr;
}
void user(CAAutoFree<char> const& captr)
{
// passed by const reference. user can access the pointer but does not take ownership.
printf("user: %08X %08X '%s'\n", &captr, captr(), captr());
}
void sink(CAAutoFree<char> captr)
{
// passed by value. sink takes ownership and frees the pointer on return.
printf("sink: %08X %08X '%s'\n", &captr, captr(), captr());
}
int main (int argc, char * const argv[])
{
CAAutoFree<char> captr(source());
printf("main captr A %08X %08X\n", &captr, captr());
user(captr);
sink(captr);
printf("main captr B %08X %08X\n", &captr, captr());
return 0;
}
#endif
#endif