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//
// Copyright (c) 2023 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_LOCALE_DETAIL_ANY_STRING_HPP_INCLUDED
#define BOOST_LOCALE_DETAIL_ANY_STRING_HPP_INCLUDED
#include <boost/locale/config.hpp>
#include <boost/assert.hpp>
#include <boost/utility/string_view.hpp>
#include <memory>
#include <stdexcept>
#include <string>
/// \cond INTERNAL
namespace boost { namespace locale { namespace detail {
/// Type-erased std::basic_string
class any_string {
struct BOOST_SYMBOL_VISIBLE base {
virtual ~base() = default;
virtual base* clone() const = 0;
protected:
base() = default;
base(const base&) = default;
base(base&&) = delete;
base& operator=(const base&) = default;
base& operator=(base&&) = delete;
};
template<typename Char>
struct BOOST_SYMBOL_VISIBLE impl : base {
explicit impl(const boost::basic_string_view<Char> value) : s(value) {}
impl* clone() const override { return new impl(*this); }
std::basic_string<Char> s;
};
std::unique_ptr<const base> s_;
public:
any_string() = default;
any_string(const any_string& other) : s_(other.s_ ? other.s_->clone() : nullptr) {}
any_string(any_string&&) = default;
any_string& operator=(any_string other) // Covers the copy and move assignment
{
s_.swap(other.s_);
return *this;
}
template<typename Char>
void set(const boost::basic_string_view<Char> s)
{
BOOST_ASSERT(!s.empty());
s_.reset(new impl<Char>(s));
}
template<typename Char>
std::basic_string<Char> get() const
{
if(!s_)
throw std::bad_cast();
return dynamic_cast<const impl<Char>&>(*s_).s;
}
};
}}} // namespace boost::locale::detail
/// \endcond
#endif
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