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104 lines
3.9 KiB
C++
104 lines
3.9 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_PARAMS_HPP
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#define MAPNIK_PARAMS_HPP
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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/util/variant.hpp>
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// stl
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#include <string>
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#include <map>
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#include <optional>
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namespace mapnik {
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// fwd declare
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class boolean_type;
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using value_holder_base = util::variant<value_null, value_integer, value_double, std::string, value_bool>;
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struct value_holder : value_holder_base
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{
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// default
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value_holder()
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: value_holder_base()
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{}
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// C-string -> std::string
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value_holder(char const* str)
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: value_holder(std::string(str))
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{}
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// perfect forwarding
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template<typename T>
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value_holder(T&& obj) noexcept(std::is_nothrow_constructible<value_holder_base, T&&>::value)
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: value_holder_base(std::forward<T>(obj))
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{}
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};
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using parameter = std::pair<std::string, value_holder>;
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using param_map = std::map<std::string, value_holder>;
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class MAPNIK_DECL parameters : public param_map
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{
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public:
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parameters() {}
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template<typename T>
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std::optional<T> get(std::string const& key) const;
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template<typename T>
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std::optional<T> get(std::string const& key, T const& default_opt_value) const;
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};
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#ifdef _MSC_VER
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template MAPNIK_DECL std::optional<std::string> parameters::get(std::string const& key) const;
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template MAPNIK_DECL std::optional<std::string> parameters::get(std::string const& key,
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std::string const& default_opt_value) const;
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template MAPNIK_DECL std::optional<value_double> parameters::get(std::string const& key) const;
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template MAPNIK_DECL std::optional<value_double> parameters::get(std::string const& key,
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value_double const& default_opt_value) const;
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template MAPNIK_DECL std::optional<value_integer> parameters::get(std::string const& key) const;
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template MAPNIK_DECL std::optional<value_integer> parameters::get(std::string const& key,
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value_integer const& default_opt_value) const;
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template MAPNIK_DECL std::optional<value_bool> parameters::get(std::string const& key) const;
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template MAPNIK_DECL std::optional<value_bool> parameters::get(std::string const& key,
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value_bool const& default_opt_value) const;
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template MAPNIK_DECL std::optional<mapnik::boolean_type> parameters::get(std::string const& key) const;
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template MAPNIK_DECL std::optional<mapnik::boolean_type>
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parameters::get(std::string const& key, mapnik::boolean_type const& default_opt_value) const;
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template MAPNIK_DECL std::optional<mapnik::value_null> parameters::get(std::string const& key) const;
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template MAPNIK_DECL std::optional<mapnik::value_null>
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parameters::get(std::string const& key, mapnik::value_null const& default_opt_value) const;
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#endif
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} // namespace mapnik
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#endif // MAPNIK_PARAMS_HPP
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