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109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
//
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// Struct.h
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// Clock Signal
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//
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// Created by Thomas Harte on 06/03/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#ifndef Struct_h
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#define Struct_h
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#include <string>
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#include <typeindex>
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#include <typeinfo>
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#include <unordered_map>
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#include <vector>
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namespace Reflection {
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#define DeclareField(Name) declare(&Name, #Name)
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template <typename Owner> class Struct {
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public:
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/*!
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@returns the value of type @c Type that is loaded from the offset registered for the field @c name.
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It is the caller's responsibility to provide an appropriate type of data.
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*/
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template <typename Type> const Type *get(const std::string &name) {
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const auto iterator = contents_.find(name);
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if(iterator == contents_.end()) return nullptr;
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return reinterpret_cast<Type *>(reinterpret_cast<uint8_t *>(this) + iterator->second.offset);
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}
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/*!
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Stores the @c value of type @c Type to the offset registered for the field @c name.
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It is the caller's responsibility to provide an appropriate type of data.
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*/
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template <typename Type> void set(const std::string &name, const Type &value) {
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const auto iterator = contents_.find(name);
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if(iterator == contents_.end()) return;
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*reinterpret_cast<Type *>(reinterpret_cast<uint8_t *>(this) + iterator->second.offset) = value;
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}
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/*!
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@returns @c type_info for the field @c name.
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*/
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const std::type_info *type_of(const std::string &name) {
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const auto iterator = contents_.find(name);
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if(iterator == contents_.end()) return nullptr;
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return iterator->second.type;
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}
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/*!
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@returns A vector of all declared fields for this struct.
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*/
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std::vector<std::string> all_keys() {
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std::vector<std::string> keys;
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for(const auto &pair: contents_) {
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keys.push_back(pair.first);
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}
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return keys;
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}
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protected:
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/*
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This interface requires reflective structs to declare all fields;
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specifically they should call:
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declare_field(&field1, "field1");
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declare_field(&field2, "field2");
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Fields are registered in class storage. So callers can use needs_declare()
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to determine whether a class of this type has already established the
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reflective fields.
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*/
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/*!
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Exposes the field pointed to by @c t for reflection as @c name.
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*/
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template <typename Type> void declare(Type *t, const std::string &name) {
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contents_.emplace(
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std::make_pair(
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name,
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Field(typeid(Type), reinterpret_cast<uint8_t *>(t) - reinterpret_cast<uint8_t *>(this))
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));
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}
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/*!
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@returns @c true if this subclass of @c Struct has not yet declared any fields.
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*/
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bool needs_declare() {
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return !contents_.size();
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}
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private:
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struct Field {
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const std::type_info *type;
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ssize_t offset;
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Field(const std::type_info &type, ssize_t offset) :
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type(&type), offset(offset) {}
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};
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static inline std::unordered_map<std::string, Field> contents_;
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};
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}
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#endif /* Struct_h */
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