/usr/include/odb/nullable.hxx is in libodb-dev 2.4.0-1+b1.
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 : Copyright (c) 2009-2015 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_NULLABLE_HXX
#define ODB_NULLABLE_HXX
#include <odb/pre.hxx>
#include <odb/forward.hxx> // odb::core
namespace odb
{
template <typename T>
class nullable
{
public:
typedef T value_type;
nullable ();
nullable (const T&);
nullable (const nullable&);
template <typename Y> explicit nullable (const nullable<Y>&);
nullable& operator= (const T&);
nullable& operator= (const nullable&);
template <typename Y> nullable& operator= (const nullable<Y>&);
void swap (nullable&);
bool null () const;
T& get ();
const T& get () const;
T* operator-> ();
const T* operator-> () const;
T& operator* ();
const T& operator* () const;
typedef void (nullable::*bool_convertible) ();
operator bool_convertible () const
{
return null_ ? 0 : &nullable<T>::true_value;
}
void reset ();
private:
void true_value () {};
T value_;
bool null_;
};
namespace common
{
using odb::nullable;
}
template <typename T>
inline nullable<T>::
nullable ()
: null_ (true)
{
}
template <typename T>
inline nullable<T>::
nullable (const T& v)
: value_ (v), null_ (false)
{
}
template <typename T>
inline nullable<T>::
nullable (const nullable& y)
: value_ (y.value_), null_ (y.null_)
{
}
template <typename T>
template <typename Y>
inline nullable<T>::
nullable (const nullable<Y>& y)
: value_ (y.value_), null_ (y.null_)
{
}
template <typename T>
inline nullable<T>& nullable<T>::
operator= (const T& v)
{
value_ = v;
null_ = false;
return *this;
}
template <typename T>
inline nullable<T>& nullable<T>::
operator= (const nullable& y)
{
if (this != &y)
{
value_ = y.value_;
null_ = y.null_;
}
return *this;
}
template <typename T>
template <typename Y>
inline nullable<T>& nullable<T>::
operator= (const nullable<Y>& y)
{
value_ = y.value_;
null_ = y.null_;
return *this;
}
template <typename T>
inline void nullable<T>::
swap (nullable& y)
{
T v (value_);
bool n (null_);
value_ = y.value_;
null_ = y.null_;
y.value_ = v;
y.null_ = n;
}
template <typename T>
inline bool nullable<T>::
null () const
{
return null_;
}
template <typename T>
inline T& nullable<T>::
get ()
{
return value_;
}
template <typename T>
inline const T& nullable<T>::
get () const
{
return value_;
}
template <typename T>
inline T* nullable<T>::
operator-> ()
{
return null_ ? 0 : &value_;
}
template <typename T>
inline const T* nullable<T>::
operator-> () const
{
return null_ ? 0 : &value_;
}
template <typename T>
inline T& nullable<T>::
operator* ()
{
return value_;
}
template <typename T>
inline const T& nullable<T>::
operator* () const
{
return value_;
}
template <typename T>
inline void nullable<T>::
reset ()
{
value_ = T ();
null_ = true;
}
}
#include <odb/post.hxx>
#endif // ODB_NULLABLE_HXX
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