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/*
* Copyright (c) 2005, Eric Crahen
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is furnished
* to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef __ZTTHREADLOCALIMPL_H__
#define __ZTTHREADLOCALIMPL_H__
#include "zthread/CountedPtr.h"
namespace ZThread {
/**
* @class ThreadLocalImpl
* @author Eric Crahen <http://www.code-foo.com>
* @date <2003-07-27T10:23:19-0400>
* @version 2.3.0
*
* @see ThreadLocal
*/
class ZTHREAD_API ThreadLocalImpl : private NonCopyable {
public:
class Value;
typedef CountedPtr<Value, size_t> ValuePtr;
//!
class Value {
Value& operator=(const Value&);
public:
virtual ~Value() {}
virtual bool isInheritable() const = 0;
virtual ValuePtr clone() const = 0;
};
//! Create a ThreadLocalImpl
ThreadLocalImpl();
//! Destroy a ThreadLocalImpl
~ThreadLocalImpl();
/**
* @class InitialValueFn
*/
template <typename T>
struct InitialValueFn {
T operator()() { return T(); }
};
/**
* @class ChildValueFn
*/
struct ChildValueFn {
template <typename T>
T operator()(const T& value) { return T(value); }
};
/**
* @class UniqueChildValueFn
*/
struct UniqueChildValueFn : public ChildValueFn { };
/**
* @class InheritableValueFn
*/
struct InheritableValueFn {
template <typename T>
bool operator()(const T&) { return true; }
bool operator()(const UniqueChildValueFn&) { return false; }
};
protected:
//! Get the Value for the current thread
ValuePtr value( ValuePtr (*pfn)() ) const;
//! Clear any value set for this thread
void clear() const;
//! Clear any value set with any ThreadLocal for this thread
static void clearAll();
};
} // __ZTTHREADLOCALIMPL_H__
#endif
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