libcruft-util/stringid.cpp

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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2014 Danny Robson <danny@nerdcruft.net>
*/
#include "stringid.hpp"
#include <stdexcept>
using cruft::stringid;
///////////////////////////////////////////////////////////////////////////////
stringid::id_t
stringid::operator[] (std::string_view const &key)
{
if (auto const pos = m_map.find (key); pos != m_map.cend ())
return pos->second;
auto const &[pos, success] = m_map.emplace (key, m_map.size ());
return pos->second;
}
///////////////////////////////////////////////////////////////////////////////
stringid::id_t
stringid::add (std::string key)
{
auto pos = m_map.find (key);
if (pos != m_map.end ())
throw std::invalid_argument ("duplicate stringid key");
id_t id = m_map.size ();
m_map.insert ({ std::move (key), id });
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return id;
}
///////////////////////////////////////////////////////////////////////////////
stringid::id_t
stringid::find (std::string_view const &key) const
{
auto pos = m_map.find (key);
if (pos == m_map.end ())
throw std::out_of_range ("invalid stringid key");
return pos->second;
}
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///////////////////////////////////////////////////////////////////////////////
std::string const&
stringid::key (id_t id) const&
{
for (auto const &[key, idx]: m_map)
if (idx == id)
return key;
throw std::out_of_range ("stringid");
}
///////////////////////////////////////////////////////////////////////////////
void
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stringid::clear (void) noexcept
{
m_map.clear ();
}
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//-----------------------------------------------------------------------------
std::size_t
stringid::size (void) const noexcept
{
return m_map.size ();
}