/usr/include/ucommon/temporary.h is in libucommon-dev 7.0.0-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright (C) 2015 Cherokees of Idaho.
//
// 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/>.
/**
* Temporary templates for C++. This offers automatic management of
* heap temporary objects.
* @file ucommon/temporary.h
*/
#ifndef _UCOMMON_TEMPORARY_H_
#define _UCOMMON_TEMPORARY_H_
#ifndef _UCOMMON_CONFIG_H_
#include <ucommon/platform.h>
#endif
#ifndef _UCOMMON_PROTOCOLS_H_
#include <ucommon/protocols.h>
#endif
#ifndef _UCOMMON_THREAD_H_
#include <ucommon/thread.h>
#endif
#ifndef _UCOMMON_STRING_H_
#include <ucommon/string.h>
#endif
#ifndef _UCOMMON_MEMORY_H_
#include <ucommon/memory.h>
#endif
#ifndef _UCOMMON_FSYS_H_
#include <ucommon/fsys.h>
#endif
#include <cstdlib>
#include <cstring>
#include <stdexcept>
#ifndef UCOMMON_SYSRUNTIME
#define THROW(x) throw x
#define THROWS(x) throw(x)
#define THROWS_ANY throw()
#else
#define THROW(x) ::abort()
#define THROWS(x)
#define THROWS_ANY
#endif
namespace ucommon {
/**
* Manage temporary object stored on the heap. This is used to create a
* object on the heap who's scope is controlled by the scope of a member
* function call. Sometimes we have data types and structures which cannot
* themselves appear as auto variables. We may also have a limited stack
* frame size in a thread context, and yet have a dynamic object that we
* only want to exist during the life of the method call. Using temporary
* allows any type to be created from the heap but have a lifespan of a
* method's stack frame.
* @author David Sugar <dyfet@gnutelephony.org>
*/
template <typename T>
class temporary
{
private:
__DELETE_COPY(temporary);
protected:
T *array;
size_t used;
public:
/**
* Construct a temporary object, create our stack frame reference.
*/
inline temporary(size_t size = 1) {
array = new T[size];
used = size;
}
inline temporary(size_t size, const T initial) {
array = new T[size];
used = size;
for(size_t p = 0; p < size; ++p)
array[p] = initial;
}
inline explicit temporary(const T initial) {
array = new T[1];
used = 1;
array[0] = initial;
}
inline ~temporary() {
if(array) {
delete[] array;
array = NULL;
}
}
inline operator T&() const {
return array[0];
}
/**
* Access heap object through our temporary directly.
* @return reference to heap resident object.
*/
inline T& operator*() const {
return array[0];
}
/**
* Access members of our heap object through our temporary.
* @return member reference of heap object.
*/
inline T* operator->() const {
return &array[0];
}
inline operator bool() const {
return array != NULL;
}
inline bool operator!() const {
return array == NULL;
}
inline temporary& operator=(const T initial) {
array[0] = initial;
return *this;
}
inline void release() {
if(array) {
delete[] array;
array = NULL;
}
}
inline T& operator[](size_t index) const {
crit(index < used, "array out of bound");
return array[index];
}
inline T* operator()(size_t index) const {
crit(index < used, "array out of bound");
return &array[index];
}
inline void operator()(size_t index, const T value) {
crit(index < used, "array out of bound");
array[index] = value;
}
inline T& value(size_t index) const {
crit(index < used, "array out of bound");
return array[index];
}
inline void value(size_t index, const T value) {
crit(index < used, "array out of bound");
array[index] = value;
}
inline size_t read(FILE *fp) {
return (fp == NULL) || (array == NULL) ?
0 : fread(array, sizeof(T), used, fp);
}
inline size_t write(FILE *fp) {
return (fp == NULL) || (array == NULL) ?
0 : fwrite(array, sizeof(T), used, fp);
}
inline size_t seek(FILE *fp, long pos) {
return (fp == NULL) ?
0 : (fseek(fp, sizeof(T) * pos, SEEK_CUR) / sizeof(T));
}
};
template<>
class temporary<char *>
{
private:
__DELETE_COPY(temporary);
protected:
char *object;
size_t used;
public:
/**
* Construct a temporary object, create our stack frame reference.
*/
inline temporary(size_t size) {
object = (char *)::malloc(size);
used = size;
}
inline operator char *() const {
return object;
}
inline size_t size() const {
return used;
}
/**
* Access heap object through our temporary directly.
* @return reference to heap resident object.
*/
inline char *operator*() const {
return object;
}
inline operator bool() const {
return object != NULL;
}
inline bool operator!() const {
return object == NULL;
}
inline void release() {
if(object) {
::free(object);
object = NULL;
}
}
inline ~temporary() {
if(object) {
::free(object);
object = NULL;
}
}
inline size_t read(FILE *fp) {
return (fp == NULL) || (object == NULL) ?
0 : String::count(fgets(object, (socksize_t)used, fp));
}
inline size_t write(FILE *fp) {
return (fp == NULL) || (object == NULL) ?
0 : fputs(object, fp);
}
inline size_t seek(FILE *fp, long pos) {
return (fp == NULL) ?
0 : fseek(fp, pos, SEEK_CUR);
}
};
template<>
class temporary<uint8_t *>
{
private:
inline temporary(const temporary<uint8_t *>&) {};
protected:
uint8_t *object;
size_t used;
public:
/**
* Construct a temporary object, create our stack frame reference.
*/
inline temporary(size_t size) {
object = (uint8_t *)::malloc(size);
used = size;
}
inline operator uint8_t *() const {
return object;
}
inline size_t size() const {
return used;
}
/**
* Access heap object through our temporary directly.
* @return reference to heap resident object.
*/
inline uint8_t *operator*() const {
return object;
}
inline operator bool() const {
return object != NULL;
}
inline bool operator!() const {
return object == NULL;
}
inline void release() {
if(object) {
::free(object);
object = NULL;
}
}
inline size_t read(FILE *fp) {
return (fp == NULL) || (object == NULL) ?
0 : fread(object, 1, used, fp);
}
inline size_t write(FILE *fp) {
return (fp == NULL) || (object == NULL) ?
0 : fwrite(object, 1, used, fp);
}
inline size_t seek(FILE *fp, long pos) {
return (fp == NULL) ?
0 : fseek(fp, pos, SEEK_CUR);
}
inline size_t read(fsys& fs) {
ssize_t result;
if(!object || (result = fs.read(object, used)) < 0)
return 0;
return (size_t)result;
}
inline size_t write(fsys& fs) {
ssize_t result;
if(!object || (result = fs.write(object, used)) < 0)
return 0;
return (size_t)result;
}
inline ~temporary() {
if(object) {
::free(object);
object = NULL;
}
}
};
} // namespace ucommon
#endif
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