/usr/include/ucommon/typeref.h is in libucommon-dev 6.4.4-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// This file is part of GNU uCommon C++.
//
// GNU uCommon C++ is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU uCommon C++ is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>.
/**
* A thread-safe atomic heap management system. This is used to manage
* immutable heap instances of object types that are reference counted
* and automatically deleted when no longer used. All references to the
* object are through smart typeref pointers. Both specific classes for
* strings and byte arrays, and generic templates to support generic
* types in the heap are offered.
* @file ucommon/typeref.h
*/
#ifndef _UCOMMON_TYPEREF_H_
#define _UCOMMON_TYPEREF_H_
#ifndef _UCOMMON_CPR_H_
#include <ucommon/cpr.h>
#endif
#ifndef _UCOMMON_ATOMIC_H_
#include <ucommon/atomic.h>
#endif
#ifndef _UCOMMON_PROTOCOLS_H_
#include <ucommon/protocols.h>
#endif
#ifndef _UCOMMON_OBJECT_H_
#include <ucommon/object.h>
#endif
namespace ucommon {
/**
* Smart pointer base class for auto-retained objects.
* @author David Sugar <dyfet@gnutelephony.org>
*/
class __EXPORT TypeRef
{
protected:
/**
* Heap base-class container for typeref objects.
* @author David Sugar <dyfet@gnutelephony.org>
*/
class __EXPORT Counted : public ObjectProtocol
{
protected:
friend class TypeRef;
mutable atomic::counter count;
size_t size;
void *memory;
explicit Counted(void *addr, size_t size);
virtual void dealloc();
public:
inline bool is() const {
return (count.get() > 0);
}
inline unsigned copies() const {
return ((unsigned)count.get());
}
void operator delete(void *addr);
void retain();
void release();
};
Counted *ref; // heap reference...
TypeRef(Counted *object);
TypeRef(const TypeRef& copy);
TypeRef();
void set(Counted *object);
static caddr_t alloc(size_t size);
static caddr_t mem(caddr_t addr);
public:
virtual ~TypeRef();
void set(const TypeRef& ptr);
void release(void);
inline bool is() const {
return ref != NULL;
}
inline bool operator!() const {
return ref == NULL;
}
inline unsigned copies() const {
if(!ref)
return 0;
return ref->copies();
}
inline size_t size() const {
if(!ref)
return 0;
return ref->size;
}
};
template<typename T>
class typeref : public TypeRef
{
private:
class value : public Counted
{
public:
inline value(caddr_t mem) :
Counted(mem, sizeof(value)) {};
inline value(caddr_t mem, const T& object) :
Counted(mem, sizeof(value)) {
data = object;
}
T data;
};
public:
inline typeref() : TypeRef() {};
inline typeref(const typeref& copy) : TypeRef(copy) {};
inline typeref(const T& object) : TypeRef() {
caddr_t p = TypeRef::alloc(sizeof(value));
TypeRef::set(new(mem(p)) value(p, object));
}
inline T* operator->() {
if(!ref)
return NULL;
value *v = polystatic_cast<value *>(ref);
return &(v->data);
}
inline const T *operator*() const {
if(!ref)
return NULL;
value *v = polystatic_cast<value*>(ref);
return &(v->data);
}
inline operator const T&() const {
value *v = polystatic_cast<value*>(ref);
return *(&(v->data));
}
inline typeref& operator=(const typeref& ptr) {
TypeRef::set(ptr);
return *this;
}
inline void set(T& object) {
release();
caddr_t p = TypeRef::alloc(sizeof(value));
TypeRef::set(new(mem(p)) value(p, object));
}
inline typeref& operator=(T& object) {
set(object);
return *this;
}
};
class __EXPORT stringref : public TypeRef
{
public:
class value : public Counted
{
protected:
friend class stringref;
char mem[1];
value(caddr_t addr, size_t size, const char *str);
void destroy(void);
public:
inline char *get() {
return &mem[0];
}
inline size_t len() {
return strlen(mem);
}
inline size_t max() {
return size;
}
};
stringref();
stringref(const stringref& copy);
stringref(const char *str);
const char *operator*() const;
inline operator const char *() const {
return operator*();
}
stringref& operator=(const stringref& objref);
stringref& operator=(const char *str);
stringref& operator=(value *chars);
const char *operator()(ssize_t offset) const;
void set(const char *str);
void assign(value *chars);
static void expand(value **handle, size_t size);
static value *create(size_t size);
static void destroy(value *bytes);
};
class __EXPORT byteref : public TypeRef
{
public:
class value : public Counted
{
protected:
friend class byteref;
uint8_t mem[1];
value(caddr_t addr, size_t size, const uint8_t *data);
value(caddr_t addr, size_t size);
void destroy(void);
public:
inline size_t max() {
return size;
}
inline uint8_t *get() {
return &mem[0];
}
};
byteref();
byteref(const byteref& copy);
byteref(const uint8_t *str, size_t size);
const uint8_t *operator*() const;
inline operator const uint8_t *() const {
return operator*();
}
byteref& operator=(const byteref& objref);
byteref& operator=(value *bytes);
void set(const uint8_t *str, size_t size);
void assign(value *bytes);
static value *create(size_t size);
static void destroy(value *bytes);
};
typedef stringref::value *charvalues_t;
typedef byteref::value *bytevalues_t;
typedef stringref stringref_t;
typedef byteref byteref_t;
} // namespace
#endif
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