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Ensures Reflection::set is widely available.

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This commit is contained in:
Thomas Harte 2020-06-27 16:26:01 -04:00
parent b4cdf8d987
commit c982c78285
2 changed files with 73 additions and 65 deletions
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65
Reflection/Struct.cpp
View File

@ -7,7 +7,6 @@
//
#include "Struct.hpp"
#include "TypeInfo.hpp"
#include <algorithm>
#include <cmath>
@ -157,70 +156,6 @@ bool Reflection::fuzzy_set(Struct &target, const std::string &name, const std::s
return false;
}
// MARK: - Getters
template <typename Type> bool Reflection::get(const Struct &target, const std::string &name, Type &value, size_t offset) {
const auto target_type = target.type_of(name);
if(!target_type) return false;
// If type is a direct match, copy.
if(*target_type == typeid(Type)) {
const auto address = reinterpret_cast<const uint8_t *>(target.get(name)) + offset * sizeof(Type);
value = *reinterpret_cast<const Type *>(address);
return true;
}
// If the type is a registered enum and the value type is int, copy.
if constexpr (std::is_integral<Type>::value && sizeof(Type) == sizeof(int)) {
if(!Enum::name(*target_type).empty()) {
memcpy(&value, target.get(name), sizeof(int));
return true;
}
}
// If the type is an int that is larger than the stored type and matches the signedness, cast upward.
if constexpr (std::is_integral<Type>::value) {
if(TypeInfo::is_integral(target_type)) {
const bool target_is_signed = TypeInfo::is_signed(target_type);
const size_t target_size = TypeInfo::size(target_type);
// An unsigned type can map to any larger type, signed or unsigned;
// a signed type can map to a larger type only if it also is signed.
if(sizeof(Type) > target_size && (!target_is_signed || std::is_signed<Type>::value)) {
const auto address = reinterpret_cast<const uint8_t *>(target.get(name)) + offset * target_size;
#define Map(x) if(*target_type == typeid(x)) { value = static_cast<Type>(*reinterpret_cast<const x *>(address)); }
ForAllInts(Map);
#undef Map
return true;
}
}
}
// If the type is a double and stored type is a float, cast upward.
if constexpr (std::is_floating_point<Type>::value) {
constexpr size_t size = sizeof(Type);
const bool target_is_floating_point = TypeInfo::is_floating_point(target_type);
const size_t target_size = TypeInfo::size(target_type);
if(size > target_size && target_is_floating_point) {
const auto address = reinterpret_cast<const uint8_t *>(target.get(name)) + offset * target_size;
#define Map(x) if(*target_type == typeid(x)) { value = static_cast<Type>(*reinterpret_cast<const x *>(address)); }
ForAllFloats(Map);
#undef Map
return true;
}
}
return false;
}
template <typename Type> Type Reflection::get(const Struct &target, const std::string &name, size_t offset) {
Type value{};
get(target, name, value, offset);
return value;
}
// MARK: - Description

73
Reflection/Struct.hpp
View File

@ -20,6 +20,7 @@
#include <vector>
#include "Enum.hpp"
#include "TypeInfo.hpp"
namespace Reflection {
@ -352,6 +353,78 @@ template <typename Owner> class StructImpl: public Struct {
static inline std::unordered_map<std::string, std::vector<bool>> permitted_enum_values_;
};
// MARK: - IMPLEMENTATION DETAILS BELOW
// DO NOT RELY ON THE IMPLEMENTATIONS BELOW.
// Please use the documentation above.
// MARK: - Getters
template <typename Type> bool get(const Struct &target, const std::string &name, Type &value, size_t offset) {
const auto target_type = target.type_of(name);
if(!target_type) return false;
// If type is a direct match, copy.
if(*target_type == typeid(Type)) {
const auto address = reinterpret_cast<const uint8_t *>(target.get(name)) + offset * sizeof(Type);
value = *reinterpret_cast<const Type *>(address);
return true;
}
// If the type is a registered enum and the value type is int, copy.
if constexpr (std::is_integral<Type>::value && sizeof(Type) == sizeof(int)) {
if(!Enum::name(*target_type).empty()) {
memcpy(&value, target.get(name), sizeof(int));
return true;
}
}
// If the type is an int that is larger than the stored type and matches the signedness, cast upward.
if constexpr (std::is_integral<Type>::value) {
if(TypeInfo::is_integral(target_type)) {
const bool target_is_signed = TypeInfo::is_signed(target_type);
const size_t target_size = TypeInfo::size(target_type);
// An unsigned type can map to any larger type, signed or unsigned;
// a signed type can map to a larger type only if it also is signed.
if(sizeof(Type) > target_size && (!target_is_signed || std::is_signed<Type>::value)) {
const auto address = reinterpret_cast<const uint8_t *>(target.get(name)) + offset * target_size;
#define Map(x) if(*target_type == typeid(x)) { value = static_cast<Type>(*reinterpret_cast<const x *>(address)); }
ForAllInts(Map);
#undef Map
return true;
}
}
}
// If the type is a double and stored type is a float, cast upward.
if constexpr (std::is_floating_point<Type>::value) {
constexpr size_t size = sizeof(Type);
const bool target_is_floating_point = TypeInfo::is_floating_point(target_type);
const size_t target_size = TypeInfo::size(target_type);
if(size > target_size && target_is_floating_point) {
const auto address = reinterpret_cast<const uint8_t *>(target.get(name)) + offset * target_size;
#define Map(x) if(*target_type == typeid(x)) { value = static_cast<Type>(*reinterpret_cast<const x *>(address)); }
ForAllFloats(Map);
#undef Map
return true;
}
}
return false;
}
template <typename Type> Type get(const Struct &target, const std::string &name, size_t offset) {
Type value{};
get(target, name, value, offset);
return value;
}
}
#endif /* Struct_hpp */