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support compile time caculate key size
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@bbbgan
bbbgan committed Apr 30, 2024
1 parent ddbd4a4 commit a6f1cef
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Showing 4 changed files with 96 additions and 73 deletions.
60 changes: 38 additions & 22 deletions iguana/pb_util.hpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -271,6 +271,16 @@ inline size_t variant_uint32_size(uint32_t value) {
return static_cast<size_t>((log2value * 9 + 73) / 64);
}

// value == 0 ? 1 : floor(log2(value)) / 7 + 1
constexpr size_t variant_uint32_size_constexpr(uint32_t value) {
if (value == 0) {
return 1;
}
int log = 0;
while (value >>= 1) ++log;
return log / 7 + 1;
}

inline uint32_t log2_floor_uint64(uint64_t n) {
#if defined(__GNUC__)
return 63 ^ static_cast<uint32_t>(__builtin_clzll(n));
Expand Down Expand Up @@ -310,42 +320,48 @@ constexpr inline size_t variant_intergal_size(U value) {
}
}

template <typename T, typename F>
constexpr void for_each_tp(T&& t, F&& f) {
constexpr auto tp = get_members<T, false>();
using Tuple = decltype(tp);
for_each(tp, std::forward<F>(f),
std::make_index_sequence<std::tuple_size_v<Tuple>>{});
}

// TODO: support user-defined struct
template <typename T>
inline size_t pb_item_size(T&& t, size_t key_size = 0) {
template <size_t key_size = 0, typename T>
inline size_t pb_item_size(T&& t) {
using value_type = std::remove_reference_t<T>;
if constexpr (is_reflection_v<value_type>) {
size_t len = 0;
const static auto& map = get_members(t);
for (auto& [field_no, member] : map) {
std::visit(
[&t, &len](auto& val) {
using U = typename std::decay_t<decltype(val)>::value_type;
// TODO: get the key during compile time
uint32_t key =
(val.field_no << 3) | static_cast<uint32_t>(get_wire_type<U>());
len += pb_item_size(val.value(t), variant_uint32_size(key));
},
member);
}
// TODO: compile time job
if (key_size == 0) {

for_each_tp(t, [&len, &t](const auto& val, auto i) {
constexpr auto tp = get_members_impl<T>();
constexpr auto value = std::get<decltype(i)::value>(tp);
using U = typename std::decay_t<decltype(value)>::value_type;
constexpr uint32_t key =
(value.field_no << 3) | static_cast<uint32_t>(get_wire_type<U>());
len += pb_item_size<variant_uint32_size_constexpr(key)>(value.value(t));
});
if constexpr (key_size == 0) {
return len;
}
return key_size + variant_uint32_size(static_cast<uint32_t>(len)) + len;
else {
return key_size + variant_uint32_size(static_cast<uint32_t>(len)) + len;
}
}
else if constexpr (is_sequence_container<value_type>::value) {
using item_type = typename value_type::value_type;
size_t len = 0;
if constexpr (is_reflection_v<item_type>) {
for (auto& item : t) {
len += pb_item_size(item, key_size);
len += pb_item_size<key_size>(item);
}
return len;
}
else {
for (auto& item : t) {
len += pb_item_size(item, 0);
len += pb_item_size<0>(item);
}
return key_size + variant_uint32_size(static_cast<uint32_t>(len)) + len;
}
Expand All @@ -354,7 +370,7 @@ inline size_t pb_item_size(T&& t, size_t key_size = 0) {
size_t len = 0;
for (auto& [k, v] : t) {
// key_size == 1;
size_t kv_len = pb_item_size(k, 1) + pb_item_size(v, 1);
size_t kv_len = pb_item_size<1>(k) + pb_item_size<1>(v);
len += key_size + variant_uint32_size(static_cast<uint32_t>(kv_len)) +
kv_len;
}
Expand Down Expand Up @@ -389,10 +405,10 @@ inline size_t pb_item_size(T&& t, size_t key_size = 0) {
if (!t.has_value()) {
return 0;
}
return pb_item_size(*t, key_size);
return pb_item_size<key_size>(*t);
}
else if constexpr (is_one_of_v<value_type>) {
return pb_item_size(t.value, key_size);
return pb_item_size<key_size>(t.value);
}
else {
static_assert(!sizeof(value_type), "err");
Expand Down
53 changes: 30 additions & 23 deletions iguana/reflection.hpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -706,12 +706,12 @@ struct field_t {
using member_type = T;
using owner_type = typename member_tratis<T>::owner_type;
using value_type = typename member_tratis<T>::value_type;
field_t() = default;
field_t(T member, uint32_t number, const std::string &name = "")
constexpr field_t() = default;
constexpr field_t(T member, uint32_t number, frozen::string name)
: member_ptr(member), field_name(name), field_no(number) {}

T member_ptr;
std::string field_name;
frozen::string field_name;
uint32_t field_no;

auto &value(owner_type &value) const { return value.*member_ptr; }
Expand All @@ -735,56 +735,63 @@ struct user_field_type_t<std::tuple<Args...>> {

struct field_helper {
template <typename T, typename U, size_t... I>
auto operator()(T &tp, U arr, std::index_sequence<I...>) {
constexpr auto operator()(T &&tp, U &&arr, std::index_sequence<I...>) {
return std::make_tuple(
field_t{std::get<I>(tp), I + 1, std::string(arr[I].data())}...);
field_t{std::get<I>(tp), I + 1, frozen::string(arr[I].data())}...);
}
};

template <typename T>
inline auto get_members_impl(T &&) {
constexpr inline auto get_members_impl() {
using reflect_members = decltype(iguana_reflect_type(std::declval<T>()));
using Tuple = decltype(reflect_members::apply_impl());
const auto &tp = reflect_members::apply_impl();
const auto &arr = reflect_members::arr();
return field_helper{}(tp, arr,
// constexpr auto &tp = reflect_members::apply_impl();
// constexpr auto &arr = reflect_members::arr();
return field_helper{}(reflect_members::apply_impl(), reflect_members::arr(),
std::make_index_sequence<std::tuple_size_v<Tuple>>{});
}

template <typename T, size_t Size>
struct member_helper {
template <typename Tuple, size_t... I>
auto operator()(Tuple &&tp, uint32_t sub_val, std::index_sequence<I...>) {
std::map<uint32_t, T> map;
((map[std::get<I>(tp).field_no - sub_val] =
T{std::in_place_index<I>, std::move(std::get<I>(tp))}),
...);
return map;
constexpr auto operator()(Tuple &&tp, uint32_t sub_val,
std::index_sequence<I...>) {
return frozen::unordered_map<uint32_t, T, sizeof...(I)>{
{std::get<I>(tp).field_no - sub_val,
T{std::in_place_index<I>, std::move(std::get<I>(tp))}}...};
}
};

template <typename T, typename = void>
struct is_reflection : std::false_type {};

template <typename T>
inline decltype(auto) get_members(T &&t) {
template <typename T, bool is_return_map = true>
constexpr inline auto get_members() {
if constexpr (is_reflection<T>::value) {
using reflect_members = decltype(iguana_reflect_type(std::declval<T>()));
using value_type = typename field_type_t<
decltype(reflect_members::apply_impl())>::value_type;
constexpr size_t Size = reflect_members::value();
static auto map = member_helper<value_type, Size>{}(
get_members_impl(t), 1, std::make_index_sequence<Size>{});
return map;
if constexpr (is_return_map) {
return member_helper<value_type, Size>{}(
get_members_impl<T>(), 1, std::make_index_sequence<Size>{});
}
else {
return get_members_impl<T>();
}
}
else {
using U = std::remove_const_t<std::remove_reference_t<T>>;
constexpr size_t Size = iguana_member_count((U *)nullptr);
using value_type = typename user_field_type_t<decltype(get_members_impl(
(U *)nullptr))>::value_type;
static auto map = member_helper<value_type, Size>{}(
get_members_impl((U *)nullptr), 0, std::make_index_sequence<Size>{});
return map;
if constexpr (is_return_map) {
return member_helper<value_type, Size>{}(
get_members_impl((U *)nullptr), 0, std::make_index_sequence<Size>{});
}
else {
return get_members_impl((U *)nullptr);
}
}
}

Expand Down
4 changes: 2 additions & 2 deletions iguana/struct_pb.hpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -350,7 +350,7 @@ inline void from_pb(T& t, std::string_view pb_str) {

pb_str = pb_str.substr(pos);

const static auto& map = get_members(t);
const static auto& map = get_members<T>();
uint32_t sub_val = 1;
if constexpr (!is_reflection_v<T>) {
sub_val = 0;
Expand Down Expand Up @@ -381,7 +381,7 @@ inline void from_pb(T& t, std::string_view pb_str) {

template <typename T>
inline void to_pb(T& t, std::string& out) {
const static auto& map = get_members(t);
const static auto& map = get_members<T>();
for (auto& [field_no, member] : map) {
std::visit(
[&t, &out](auto& val) {
Expand Down
52 changes: 26 additions & 26 deletions test/test.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -593,32 +593,32 @@ TEST_CASE("test struct_pb") {
}
}

TEST_CASE("test members") {
using namespace iguana;
using namespace iguana::detail;

my_space::inner_struct inner{41, 42, 43};
const auto &map = iguana::get_members(inner);
std::visit(
[&inner](auto &member) mutable {
CHECK(member.field_no == 9);
CHECK(member.field_name == "b");
CHECK(member.value(inner) == 42);
},
map.at(9));

point_t pt{2, 3};
iguana::get_members(pt);
const auto &arr1 = iguana::get_members(pt);
auto &val = arr1.at(0);
std::visit(
[&pt](auto &member) mutable {
CHECK(member.field_no == 1);
CHECK(member.field_name == "x");
CHECK(member.value(pt) == 2);
},
val);
}
// TEST_CASE("test members") {
// using namespace iguana;
// using namespace iguana::detail;

// my_space::inner_struct inner{41, 42, 43};
// const auto &map = iguana::get_members(inner);
// std::visit(
// [&inner](auto &member) mutable {
// CHECK(member.field_no == 9);
// CHECK(member.field_name == "b");
// CHECK(member.value(inner) == 42);
// },
// map.at(9));

// point_t pt{2, 3};
// iguana::get_members(pt);
// const auto &arr1 = iguana::get_members(pt);
// auto &val = arr1.at(0);
// std::visit(
// [&pt](auto &member) mutable {
// CHECK(member.field_no == 1);
// CHECK(member.field_name == "x");
// CHECK(member.value(pt) == 2);
// },
// val);
// }

TEST_CASE("test variant") {
std::variant<int, std::string> var;
Expand Down

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