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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
// Copyright (c) 2022 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_SRC_LOCALE_IOS_PROP_HPP
#define BOOST_SRC_LOCALE_IOS_PROP_HPP
#include <boost/locale/config.hpp>
#include <boost/assert.hpp>
#include <ios>
namespace boost { namespace locale { namespace impl {
template<typename Property>
class BOOST_SYMBOL_VISIBLE ios_prop {
public:
static Property& get(std::ios_base& ios)
{
Property* result = get_impl(ios);
return result ? *result : create(ios);
}
static void global_init() { get_id(); }
private:
static Property* get_impl(std::ios_base& ios) { return static_cast<Property*>(ios.pword(get_id())); }
static Property& create(std::ios_base& ios)
{
BOOST_ASSERT_MSG(!get_impl(ios), "Called create while the property already exists");
const int id = get_id();
ios.register_callback(callback, id);
Property* value = new Property();
ios.pword(id) = value;
return *value;
}
static void callback(std::ios_base::event ev, std::ios_base& ios, int id)
{
Property* prop = get_impl(ios);
if(!prop)
return;
switch(ev) {
case std::ios_base::erase_event:
delete prop;
ios.pword(id) = nullptr;
break;
case std::ios_base::copyfmt_event: ios.pword(id) = new Property(*prop); break;
case std::ios_base::imbue_event: prop->on_imbue(); break;
default: break;
}
}
static int get_id()
{
static int id = std::ios_base::xalloc();
return id;
}
};
}}} // namespace boost::locale::impl
#endif
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