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/**
** \file misc/xalloc.hxx
** \brief Implementation for misc/xalloc.hh.
*/
#pragma once
#include <utility>
#include <misc/xalloc.hh>
namespace misc
{
/*----------------.
| iomanipulator. |
`----------------*/
inline std::ostream& operator<<(std::ostream& o, const iomanipulator& g)
{
g(o);
return o;
}
/*---------------------.
| xalloc<StoredType>. |
`---------------------*/
template <class StoredType>
template <typename... Args>
xalloc<StoredType>::xalloc(Args&&... args)
: index_(std::ios::xalloc())
, model_{std::forward<Args>(args)...}
{}
template <class StoredType> long int xalloc<StoredType>::index() const
{
return index_;
}
template <class StoredType>
StoredType& xalloc<StoredType>::operator()(std::ostream& ostr) const
{
void*& storage_ptr = ostr.pword(index_);
if (!storage_ptr)
{
storage_ptr = new StoredType{model_};
ostr.register_callback(xalloc::deallocate, index_);
}
return *static_cast<StoredType*>(storage_ptr);
}
template <class StoredType>
void xalloc<StoredType>::deallocate(std::ios_base::event type,
std::ios_base& ios,
int index)
{
if (type == std::ios_base::erase_event)
{
StoredType* ptr = static_cast<StoredType*>(ios.pword(index));
delete ptr;
}
}
/*-----------.
| set_type. |
`-----------*/
template <class StoredType>
xalloc<StoredType>::set_type::set_type(const xalloc& slot, StoredType& data)
: slot_(slot)
, data_(data)
{}
template <class StoredType>
void xalloc<StoredType>::set_type::operator()(std::ostream& ostr) const
{
slot_(ostr) = data_;
}
template <class StoredType>
typename xalloc<StoredType>::set_type
xalloc<StoredType>::set(StoredType& data) const
{
return set_type(*this, data);
}
/*-----------.
| get_type. |
`-----------*/
template <class StoredType>
xalloc<StoredType>::get_type::get_type(const xalloc& slot, StoredType& data)
: slot_(slot)
, data_(data)
{}
template <class StoredType>
void xalloc<StoredType>::get_type::operator()(std::ostream& ostr) const
{
data_ = slot_(ostr);
}
template <class StoredType>
typename xalloc<StoredType>::get_type
xalloc<StoredType>::get(StoredType& data) const
{
return get_type(*this, data);
}
/*------------.
| swap_type. |
`------------*/
template <class StoredType>
xalloc<StoredType>::swap_type::swap_type(const xalloc& slot, StoredType& data)
: slot_(slot)
, data_(data)
{}
template <class StoredType>
void xalloc<StoredType>::swap_type::operator()(std::ostream& ostr) const
{
std::swap(slot_(ostr), data_);
}
template <class StoredType>
typename xalloc<StoredType>::swap_type
xalloc<StoredType>::swap(StoredType& data) const
{
return swap_type(*this, data);
}
} // namespace misc
|
