pointer.h

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#pragma once
#ifndef SYDEVS_POINTER_H_
#define SYDEVS_POINTER_H_
 
#include <sydevs/core/number_types.h>
#include <memory>
 
namespace sydevs {
 
 
class pointer
{
public:
    pointer() noexcept;
 
    explicit pointer(std::nullptr_t X) noexcept;
 
    template<typename T> 
    explicit pointer(T* ptr);
 
    pointer(const pointer&) noexcept            = default;  
    pointer& operator=(const pointer&) noexcept = default;  
    pointer(pointer&&) noexcept                 = default;  
    pointer& operator=(pointer&&) noexcept      = default;  
    ~pointer()                                  = default;  
 
    void reset() noexcept;  
 
    template<typename T> 
    void reset(T* ptr);  
 
    template<typename T> 
    T& dereference() const;  
    
    explicit operator bool() const noexcept;  
 
private:
    std::shared_ptr<void> ptr_;
};
 
 
inline pointer::pointer() noexcept
    : ptr_()
{
}
 
 
inline pointer::pointer(std::nullptr_t X) noexcept
    : ptr_(X)
{
}
 
 
template<typename T> 
inline pointer::pointer(T* ptr)
    : ptr_(ptr)
{
}
 
 
inline void pointer::reset() noexcept
{
    ptr_.reset();
}
 
 
template<typename T> 
inline void pointer::reset(T* ptr)
{
    ptr_.reset(ptr);
}
 
 
template<typename T> 
inline T& pointer::dereference() const
{
    if (!ptr_) throw std::logic_error("Attempt to dereference null pointer object");
    return *static_cast<T*>(ptr_.get());
}
 
    
inline pointer::operator bool() const noexcept
{
    return bool(ptr_);
}
 
 
}  // namespace
 
#endif