libcruft-util/stringid.hpp

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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/.
*
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* Copyright:
* 2014-2018 Danny Robson <danny@nerdcruft.net>
* 2022 Danny Robson <danny@nerdcruft.net>
*/
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#pragma once
#include "view.hpp"
#include <map>
#include <string>
namespace cruft {
class stringid {
public:
typedef size_t id_t;
///////////////////////////////////////////////////////////////////////
/// Returns the ID for the supplied string, or creates and returns a
/// new ID if the string is not present.
id_t operator[] (std::string_view const&);
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// provided for symmetry with std member names
id_t at (std::string_view const &name) const { return find (name); }
///////////////////////////////////////////////////////////////////////
id_t add (std::string);
//---------------------------------------------------------------------
template <typename T>
id_t add (cruft::view<T> key)
{
return add (
std::string{
std::cbegin (key),
std::cend (key)
}
);
}
///////////////////////////////////////////////////////////////////////
id_t find (std::string_view const&) const;
//---------------------------------------------------------------------
template <typename T>
id_t find (cruft::view<T> key) const
{
return find (
std::string_view {
std::cbegin (key),
std::cend (key)
}
);
}
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///////////////////////////////////////////////////////////////////////
/// Returns the underlying string that an id maps to.
///
/// If there is no such id then a std::out_of_range exception is
/// thrown.
std::string const&
key (id_t id) const&;
///////////////////////////////////////////////////////////////////////
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void clear (void) noexcept;
std::size_t size (void) const noexcept;
private:
std::map<std::string const, id_t, std::less<>> m_map;
};
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}