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Switches to class storage.

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This commit is contained in:
Thomas Harte 2020-03-08 21:23:29 -04:00
parent 5248475e73
commit 6a8c6f5a06
1 changed files with 44 additions and 9 deletions
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53
Reflection/Struct.h
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@ -9,25 +9,32 @@
#ifndef Struct_h #ifndef Struct_h
#define Struct_h #define Struct_h
#include <any>
#include <string> #include <string>
#include <typeindex>
#include <typeinfo>
#include <unordered_map> #include <unordered_map>
#include <vector> #include <vector>
namespace Reflection { namespace Reflection {
class Struct { template <typename Owner> class Struct {
public: public:
template <typename Type> const Type &get(const std::string &name) { template <typename Type> const Type *get(const std::string &name) {
return *std::any_cast<Type *>(contents_[name]); const auto iterator = contents_.find(name);
if(iterator == contents_.end()) return nullptr;
return reinterpret_cast<Type *>(reinterpret_cast<uint8_t *>(this) + iterator->second.offset);
} }
template <typename Type> void set(const std::string &name, const Type &value) { template <typename Type> void set(const std::string &name, const Type &value) {
*std::any_cast<Type *>(contents_[name]) = value; const auto iterator = contents_.find(name);
if(iterator == contents_.end()) return;
*reinterpret_cast<Type *>(reinterpret_cast<uint8_t *>(this) + iterator->second.offset) = value;
} }
const std::type_info &type_of(const std::string &name) { const std::type_info *type_of(const std::string &name) {
return contents_[name].type(); const auto iterator = contents_.find(name);
if(iterator == contents_.end()) return nullptr;
return iterator->second.type;
} }
std::vector<std::string> all_keys() { std::vector<std::string> all_keys() {
@ -39,12 +46,40 @@ class Struct {
} }
protected: protected:
/*
This interface requires reflective structs to declare all fields;
specifically they should call:
declare_field(&field1, "field1");
declare_field(&field2, "field2");
Fields are registered in class storage. So callers can use needs_declare()
to determine whether a class of this type has already established the
reflective fields.
*/
template <typename Type> void declare(Type *t, const std::string &name) { template <typename Type> void declare(Type *t, const std::string &name) {
contents_[name] = t; contents_.emplace(
std::make_pair(
name,
Field(typeid(Type), reinterpret_cast<uint8_t *>(t) - reinterpret_cast<uint8_t *>(this))
));
}
/*!
@returns @c true if this
*/
bool needs_declare() {
return !contents_.size();
} }
private: private:
std::unordered_map<std::string, std::any> contents_; struct Field {
const std::type_info *type;
ssize_t offset;
Field(const std::type_info &type, ssize_t offset) :
type(&type), offset(offset) {}
};
static inline std::unordered_map<std::string, Field> contents_;
}; };
} }