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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_SRC_LOCALE_IOS_PROP_HPP
#define BOOST_SRC_LOCALE_IOS_PROP_HPP
#include <ios>
namespace boost {
namespace locale {
namespace impl {
template<typename Property>
class ios_prop {
public:
static void set(Property const &prop,std::ios_base &ios)
{
int id=get_id();
if(ios.pword(id)==0) {
ios.pword(id) = new Property(prop);
ios.register_callback(callback,id);
}
else if(ios.pword(id)==invalid) {
ios.pword(id) = new Property(prop);
}
else {
*static_cast<Property *>(ios.pword(id))=prop;
}
}
static Property &get(std::ios_base &ios)
{
int id=get_id();
if(!has(ios))
set(Property(),ios);
return *static_cast<Property *>(ios.pword(id));
}
static bool has(std::ios_base &ios)
{
int id=get_id();
if(ios.pword(id)==0 || ios.pword(id)==invalid)
return false;
return true;
}
static void unset(std::ios_base &ios)
{
if(has(ios)) {
int id=get_id();
Property *p=static_cast<Property *>(ios.pword(id));
delete p;
ios.pword(id)=invalid;
}
}
static void global_init()
{
get_id();
}
private:
static void * const invalid;
static void callback(std::ios_base::event ev,std::ios_base &ios,int id)
{
switch(ev) {
case std::ios_base::erase_event:
if(!has(ios))
break;
delete reinterpret_cast<Property *>(ios.pword(id));
break;
case std::ios_base::copyfmt_event:
if(ios.pword(id)==invalid || ios.pword(id)==0)
break;
ios.pword(id)=new Property(*reinterpret_cast<Property *>(ios.pword(id)));
break;
case std::ios_base::imbue_event:
if(ios.pword(id)==invalid || ios.pword(id)==0)
break;
reinterpret_cast<Property *>(ios.pword(id))->on_imbue();
break;
default: ;
}
}
static int get_id()
{
static int id = std::ios_base::xalloc();
return id;
}
};
template<typename Property>
void * const ios_prop<Property>::invalid = (void *)(-1);
}
}
}
#endif
// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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