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// file : cult/containers/any.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef CULT_CONTAINERS_ANY_HXX
#define CULT_CONTAINERS_ANY_HXX
#include <cult/types.hxx>
#include <cult/rtti/type-id.hxx>
namespace Cult
{
namespace Containers
{
//@@ eager clonning: do I need it?
//
//
class Any
{
public:
struct Typing {};
public:
template <typename X>
Any (X const& x)
: holder_ (new HolderTemplate<X> (x))
{
}
Any (Any const& any)
: holder_ (any.holder_->clone ())
{
}
public:
template <typename X>
Any&
operator= (X const& x)
{
holder_ = Evptr<Holder> (new HolderTemplate<X> (x));
return *this;
}
Any&
operator= (Any const& any)
{
holder_ = any.holder_->clone ();
return *this;
}
public:
/*
template <typename X>
operator X& ()
{
return value<X> ();
}
template <typename X>
operator X const& () const
{
return value<X> ();
}
*/
public:
template <typename X>
X&
value ()
{
//@@ too strict
//
if (holder_->type_id () == typeid (X))
{
return dynamic_cast<HolderTemplate<X>*>(holder_.get ())->value ();
}
else
{
throw Typing ();
}
}
template <typename X>
X const&
value () const
{
if (holder_->type_id () == typeid (X))
{
return dynamic_cast<HolderTemplate<X>*>(holder_.get ())->value ();
}
else
{
throw Typing ();
}
}
public:
RTTI::TypeId
type_id () const
{
return holder_->type_id ();
}
public:
/*
template <typename x>
friend x
operator+ (any const& a, x const& b)
{
return a.value<x> () + b;
}
template <typename x>
friend x
operator+ (x const& a, any const& b)
{
return a + b.value<x> ();
}
*/
private:
class Holder
{
public:
virtual
~Holder ()
{
}
Evptr<Holder>
clone () const
{
return clone_ ();
}
virtual RTTI::TypeId
type_id () const = 0;
protected:
virtual Evptr<Holder>
clone_ () const = 0;
};
template <typename X>
class HolderTemplate : public Holder
{
public:
HolderTemplate (X const& value)
: value_ (value)
{
}
virtual RTTI::TypeId
type_id () const
{
return RTTI::TypeId (typeid (value_));
}
X const&
value () const
{
return value_;
}
X&
value ()
{
return value_;
}
protected:
virtual Evptr<Holder>
clone_ () const
{
return new HolderTemplate<X> (value_);
}
private:
X value_;
};
private:
Evptr<Holder> holder_;
};
}
}
#include <cult/containers/any.txx>
#endif // CULT_CONTAINERS_ANY_HXX
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