mirror of
https://github.com/BlackMATov/meta.hpp.git
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114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/*******************************************************************************
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* This file is part of the "https://github.com/blackmatov/meta.hpp"
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* For conditions of distribution and use, see copyright notice in LICENSE.md
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* Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
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******************************************************************************/
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#pragma once
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#include "meta_fwd.hpp"
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#include "meta_value.hpp"
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#include "meta_data_info.hpp"
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namespace meta_hpp::variable_detail
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{
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template < typename Variable >
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struct variable_traits;
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template < typename T >
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struct variable_traits<T*> {
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static constexpr bool is_const = false;
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using value_type = T;
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};
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template < typename T >
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struct variable_traits<const T*> {
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static constexpr bool is_const = true;
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using value_type = T;
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};
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template < auto Variable >
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value getter() {
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using vt = variable_traits<decltype(Variable)>;
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using value_type = typename vt::value_type;
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value_type typed_value = *Variable;
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return value{std::move(typed_value)};
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}
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template < auto Variable >
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void setter(value value) {
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using vt = variable_traits<decltype(Variable)>;
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using value_type = typename vt::value_type;
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if constexpr ( !vt::is_const ) {
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*Variable = value.cast<value_type>();
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} else {
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throw std::logic_error("an attempt to change a constant variable");
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}
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}
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}
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namespace meta_hpp
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{
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class variable_info {
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public:
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variable_info() = delete;
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variable_info(variable_info&&) = default;
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variable_info(const variable_info&) = default;
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variable_info& operator=(variable_info&&) = default;
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variable_info& operator=(const variable_info&) = default;
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variable_info(family_id fid, std::string id)
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: fid_(std::move(fid))
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, id_(std::move(id)) {}
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public:
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const family_id& fid() const noexcept {
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return fid_;
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}
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const std::string& id() const noexcept {
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return id_;
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}
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value get() const {
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return getter_();
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}
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template < typename Value >
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void set(Value&& value) const {
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return setter_(std::forward<Value>(value));
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}
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template < typename F >
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void each_data(F&& f) const {
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for ( auto [_, info] : datas_ ) {
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std::invoke(f, info);
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}
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}
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std::optional<data_info> get_data(std::string_view id) const {
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return detail::find_opt(datas_, id);
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}
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void merge(const variable_info& other) {
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if ( fid() != other.fid() ) {
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throw std::logic_error("variable_info::merge failed");
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}
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detail::merge_with(datas_, other.datas_, &data_info::merge);
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}
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private:
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template < auto Variable >
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friend class variable_;
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private:
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family_id fid_;
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std::string id_;
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value(*getter_)();
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void(*setter_)(value);
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std::map<std::string, data_info, std::less<>> datas_;
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};
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}
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