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sol2/include/sol/stack_check_unqualified.hpp

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// sol2
// The MIT License (MIT)
// Copyright (c) 2013-2022 Rapptz, ThePhD and contributors
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#ifndef SOL_STACK_CHECK_UNQUALIFIED_HPP
#define SOL_STACK_CHECK_UNQUALIFIED_HPP
#include <sol/stack_core.hpp>
#include <sol/usertype_traits.hpp>
#include <sol/inheritance.hpp>
#include <memory>
#include <functional>
#include <utility>
#include <cmath>
#include <optional>
#if SOL_IS_ON(SOL_STD_VARIANT)
#include <variant>
#endif // variant shenanigans
namespace sol { namespace stack {
template <typename Handler>
bool loose_table_check(lua_State* L_, int index, Handler&& handler, record& tracking) {
tracking.use(1);
type t = type_of(L_, index);
if (t == type::table) {
return true;
}
if (t != type::userdata) {
handler(L_, index, type::table, t, "value is not a table or a userdata that can behave like one");
return false;
}
return true;
}
namespace stack_detail {
inline bool impl_check_metatable(lua_State* L_, int index, const std::string& metakey, bool poptable) {
luaL_getmetatable(L_, &metakey[0]);
const type expectedmetatabletype = static_cast<type>(lua_type(L_, -1));
if (expectedmetatabletype != type::lua_nil) {
if (lua_rawequal(L_, -1, index) == 1) {
lua_pop(L_, 1 + static_cast<int>(poptable));
return true;
}
}
lua_pop(L_, 1);
return false;
}
template <typename T, bool poptable = true>
inline bool check_metatable(lua_State* L_, int index = -2) {
return impl_check_metatable(L_, index, usertype_traits<T>::metatable(), poptable);
}
template <type expected, int (*check_func)(lua_State*, int)>
struct basic_check {
template <typename Handler>
static bool check(lua_State* L_, int index, Handler&& handler, record& tracking) {
tracking.use(1);
bool success = check_func(L_, index) == 1;
if (!success) {
// expected type, actual type
handler(L_, index, expected, type_of(L_, index), "");
}
return success;
}
};
} // namespace stack_detail
template <typename T, typename>
struct unqualified_interop_checker {
template <typename Handler>
static bool check(lua_State*, int, type, Handler&&, record&) {
return false;
}
};
template <typename T, typename>
struct qualified_interop_checker {
template <typename Handler>
static bool check(lua_State* L_, int index, type index_type, Handler&& handler, record& tracking) {
return stack_detail::unqualified_interop_check<T>(L_, index, index_type, std::forward<Handler>(handler), tracking);
}
};
template <typename T, type expected, typename>
struct unqualified_checker {
template <typename Handler>
static bool check(lua_State* L_, int index, Handler&& handler, record& tracking) {
if constexpr (std::is_same_v<T, bool>) {
tracking.use(1);
bool success = lua_isboolean(L_, index) == 1;
if (!success) {
// expected type, actual type
handler(L_, index, expected, type_of(L_, index), "");
}
return success;
}
else if constexpr (meta::any_same_v<T,
char
#if SOL_IS_ON(SOL_CHAR8_T)
,
char8_t
#endif
,
char16_t,
char32_t>) {
return stack::check<std::basic_string<T>>(L_, index, std::forward<Handler>(handler), tracking);
}
else if constexpr (std::is_integral_v<T> || std::is_same_v<T, lua_Integer>) {
tracking.use(1);
#if SOL_LUA_VERSION_I_ >= 503
// Lua 5.3 and greater checks for numeric precision
#if SOL_IS_ON(SOL_STRINGS_ARE_NUMBERS)
// imprecise, sloppy conversions
int isnum = 0;
lua_tointegerx(L_, index, &isnum);
const bool success = isnum != 0;
if (!success) {
// expected type, actual type
handler(L_, index, type::number, type_of(L_, index), detail::not_a_number_or_number_string_integral);
}
#elif SOL_IS_ON(SOL_NUMBER_PRECISION_CHECKS)
// this check is precise, do not convert
if (lua_isinteger(L_, index) == 1) {
return true;
}
const bool success = false;
if (!success) {
// expected type, actual type
handler(L_, index, type::number, type_of(L_, index), detail::not_a_number_integral);
}
#else
// Numerics are neither safe nor string-convertible
type t = type_of(L_, index);
const bool success = t == type::number;
#endif
if (!success) {
// expected type, actual type
handler(L_, index, type::number, type_of(L_, index), detail::not_a_number);
}
return success;
#else
// Lua 5.2 and below checks
#if SOL_IS_OFF(SOL_STRINGS_ARE_NUMBERS)
// must pre-check, because it will convert
type t = type_of(L_, index);
if (t != type::number) {
// expected type, actual type
handler(L_, index, type::number, t, detail::not_a_number);
return false;
}
#endif // Do not allow strings to be numbers
#if SOL_IS_ON(SOL_NUMBER_PRECISION_CHECKS)
int isnum = 0;
const lua_Number v = lua_tonumberx(L_, index, &isnum);
const bool success = isnum != 0 && static_cast<lua_Number>(llround(v)) == v;
#else
const bool success = true;
#endif // Safe numerics and number precision checking
if (!success) {
// Use defines to provide a better error message!
#if SOL_IS_ON(SOL_STRINGS_ARE_NUMBERS)
handler(L_, index, type::number, type_of(L_, index), detail::not_a_number_or_number_string);
#elif SOL_IS_ON(SOL_NUMBER_PRECISION_CHECKS)
handler(L_, index, type::number, t, detail::not_a_number_or_number_string);
#else
handler(L_, index, type::number, t, detail::not_a_number);
#endif
}
return success;
#endif
}
else if constexpr (std::is_floating_point_v<T> || std::is_same_v<T, lua_Number>) {
tracking.use(1);
#if SOL_IS_ON(SOL_STRINGS_ARE_NUMBERS)
bool success = lua_isnumber(L_, index) == 1;
if (!success) {
// expected type, actual type
handler(L_, index, type::number, type_of(L_, index), detail::not_a_number_or_number_string);
}
return success;
#else
type t = type_of(L_, index);
bool success = t == type::number;
if (!success) {
// expected type, actual type
handler(L_, index, type::number, t, detail::not_a_number);
}
return success;
#endif // Strings are Numbers
}
else if constexpr (meta::any_same_v<T, type, this_state, this_main_state, this_environment, variadic_args>) {
(void)L_;
(void)index;
(void)handler;
tracking.use(0);
return true;
}
else if constexpr (is_unique_usertype_v<T>) {
using element = unique_usertype_element_t<T>;
using actual = unique_usertype_actual_t<T>;
const type indextype = type_of(L_, index);
tracking.use(1);
if (indextype != type::userdata) {
handler(L_, index, type::userdata, indextype, "value is not a userdata");
return false;
}
if (lua_getmetatable(L_, index) == 0) {
return true;
}
int metatableindex = lua_gettop(L_);
if (stack_detail::check_metatable<d::u<element>>(L_, metatableindex)) {
void* memory = lua_touserdata(L_, index);
memory = detail::align_usertype_unique_destructor(memory);
detail::unique_destructor& pdx = *static_cast<detail::unique_destructor*>(memory);
bool success = &detail::usertype_unique_alloc_destroy<element, actual> == pdx;
if (!success) {
memory = detail::align_usertype_unique_tag<true>(memory);
#if 0
// New version, one day
#else
const char*& name_tag = *static_cast<const char**>(memory);
success = usertype_traits<T>::qualified_name() == name_tag;
#endif
if (!success) {
handler(L_, index, type::userdata, indextype, "value is a userdata but is not the correct unique usertype");
}
}
return success;
}
lua_pop(L_, 1);
handler(L_, index, type::userdata, indextype, "unrecognized userdata (not pushed by sol?)");
return false;
}
else if constexpr (meta::any_same_v<T, lua_nil_t, std::nullopt_t, nullopt_t>) {
bool success = lua_isnil(L_, index);
if (success) {
tracking.use(1);
return success;
}
tracking.use(0);
success = lua_isnone(L_, index);
if (!success) {
// expected type, actual type
handler(L_, index, expected, type_of(L_, index), "");
}
return success;
}
else if constexpr (std::is_same_v<T, env_key_t>) {
tracking.use(1);
type t = type_of(L_, index);
if (t == type::table || t == type::none || t == type::lua_nil || t == type::userdata) {
return true;
}
handler(L_, index, type::table, t, "value cannot not have a valid environment");
return true;
}
else if constexpr (std::is_same_v<T, detail::non_lua_nil_t>) {
return !stack::unqualified_check<lua_nil_t>(L_, index, std::forward<Handler>(handler), tracking);
}
else if constexpr (meta::is_specialization_of_v<T, basic_lua_table>) {
tracking.use(1);
type t = type_of(L_, index);
if (t != type::table) {
handler(L_, index, type::table, t, "value is not a table");
return false;
}
return true;
}
else if constexpr (meta::is_specialization_of_v<T, basic_bytecode>) {
tracking.use(1);
type t = type_of(L_, index);
if (t != type::function) {
handler(L_, index, type::function, t, "value is not a function that can be dumped");
return false;
}
return true;
}
else if constexpr (meta::is_specialization_of_v<T, basic_environment>) {
tracking.use(1);
if (lua_getmetatable(L_, index) == 0) {
return true;
}
type t = type_of(L_, -1);
if (t == type::table || t == type::none || t == type::lua_nil) {
lua_pop(L_, 1);
return true;
}
if (t != type::userdata) {
lua_pop(L_, 1);
handler(L_, index, type::table, t, "value does not have a valid metatable");
return false;
}
return true;
}
else if constexpr (std::is_same_v<T, metatable_key_t>) {
tracking.use(1);
if (lua_getmetatable(L_, index) == 0) {
return true;
}
type t = type_of(L_, -1);
if (t == type::table || t == type::none || t == type::lua_nil) {
lua_pop(L_, 1);
return true;
}
if (t != type::userdata) {
lua_pop(L_, 1);
handler(L_, index, expected, t, "value does not have a valid metatable");
return false;
}
return true;
}
else if constexpr (std::is_same_v<T, luaL_Stream*> || std::is_same_v<T, luaL_Stream>) {
if (lua_getmetatable(L_, index) == 0) {
type t = type_of(L_, index);
handler(L_, index, expected, t, "value is not a valid luaL_Stream (has no metatable/is not a valid value)");
return false;
}
luaL_getmetatable(L_, LUA_FILEHANDLE);
if (type_of(L_, index) != type::table) {
type t = type_of(L_, index);
lua_pop(L_, 1);
handler(L_,
index,
expected,
t,
"value is not a valid luaL_Stream (there is no metatable for luaL_Stream -- did you forget to "
"my_lua_state.open_libraries(sol::lib::state) or equivalent?)");
return false;
}
int is_stream_table = lua_compare(L_, -1, -2, LUA_OPEQ);
lua_pop(L_, 2);
if (is_stream_table == 0) {
type t = type_of(L_, index);
handler(L_, index, expected, t, "value is not a valid luaL_Stream (incorrect metatable)");
return false;
}
return true;
}
else if constexpr (meta::is_optional_v<T>) {
using ValueType = typename T::value_type;
(void)handler;
type t = type_of(L_, index);
if (t == type::none) {
tracking.use(0);
return true;
}
if (t == type::lua_nil) {
tracking.use(1);
return true;
}
return stack::unqualified_check<ValueType>(L_, index, &no_panic, tracking);
}
#if SOL_IS_ON(SOL_GET_FUNCTION_POINTER_UNSAFE)
else if constexpr (std::is_function_v<T> || (std::is_pointer_v<T> && std::is_function_v<std::remove_pointer_t<T>>)) {
return stack_detail::check_function_pointer<std::remove_pointer_t<T>>(L_, index, std::forward<Handler>(handler), tracking);
}
#endif
else if constexpr (expected == type::userdata) {
if constexpr (meta::any_same_v<T, userdata_value> || meta::is_specialization_of_v<T, basic_userdata>) {
tracking.use(1);
type t = type_of(L_, index);
bool success = t == type::userdata;
if (!success) {
// expected type, actual type
handler(L_, index, type::userdata, t, "");
}
return success;
}
else if constexpr (meta::is_specialization_of_v<T, user>) {
unqualified_checker<lightuserdata_value, type::userdata> c;
(void)c;
return c.check(L_, index, std::forward<Handler>(handler), tracking);
}
else {
if constexpr (std::is_pointer_v<T>) {
return check_usertype<T>(L_, index, std::forward<Handler>(handler), tracking);
}
else if constexpr (meta::is_specialization_of_v<T, std::reference_wrapper>) {
using T_internal = typename T::type;
return stack::check<T_internal>(L_, index, std::forward<Handler>(handler), tracking);
}
else {
return check_usertype<T>(L_, index, std::forward<Handler>(handler), tracking);
}
}
}
else if constexpr (expected == type::poly) {
tracking.use(1);
bool success = is_lua_reference_v<T> || !lua_isnone(L_, index);
if (!success) {
// expected type, actual type
handler(L_, index, type::poly, type_of(L_, index), "");
}
return success;
}
else if constexpr (expected == type::lightuserdata) {
tracking.use(1);
type t = type_of(L_, index);
bool success = t == type::userdata || t == type::lightuserdata;
if (!success) {
// expected type, actual type
handler(L_, index, type::lightuserdata, t, "");
}
return success;
}
else if constexpr (expected == type::function) {
if constexpr (meta::any_same_v<T, lua_CFunction, std::remove_pointer_t<lua_CFunction>, c_closure>) {
tracking.use(1);
bool success = lua_iscfunction(L_, index) == 1;
if (!success) {
// expected type, actual type
handler(L_, index, expected, type_of(L_, index), "");
}
return success;
}
else {
tracking.use(1);
type t = type_of(L_, index);
if (t == type::lua_nil || t == type::none || t == type::function) {
// allow for lua_nil to be returned
return true;
}
if (t != type::userdata && t != type::table) {
handler(L_, index, type::function, t, "must be a function or table or a userdata");
return false;
}
// Do advanced check for call-style userdata?
static const auto& callkey = to_string(meta_function::call);
if (lua_getmetatable(L_, index) == 0) {
// No metatable, no __call key possible
handler(L_, index, type::function, t, "value is not a function and does not have overriden metatable");
return false;
}
if (lua_isnoneornil(L_, -1)) {
lua_pop(L_, 1);
handler(L_, index, type::function, t, "value is not a function and does not have valid metatable");
return false;
}
lua_getfield(L_, -1, &callkey[0]);
if (lua_isnoneornil(L_, -1)) {
lua_pop(L_, 2);
handler(L_, index, type::function, t, "value's metatable does not have __call overridden in metatable, cannot call this type");
return false;
}
// has call, is definitely a function
lua_pop(L_, 2);
return true;
}
}
else if constexpr (expected == type::table) {
return stack::loose_table_check(L_, index, std::forward<Handler>(handler), tracking);
}
else {
tracking.use(1);
const type indextype = type_of(L_, index);
bool success = expected == indextype;
if (!success) {
// expected type, actual type, message
handler(L_, index, expected, indextype, "");
}
return success;
}
}
};
template <typename T>
struct unqualified_checker<non_null<T>, type::userdata> : unqualified_checker<T, lua_type_of_v<T>> { };
template <typename T>
struct unqualified_checker<detail::as_value_tag<T>, type::userdata> {
template <typename Handler>
static bool check(lua_State* L_, int index, Handler&& handler, record& tracking) {
const type indextype = type_of(L_, index);
return check(types<T>(), L_, index, indextype, std::forward<Handler>(handler), tracking);
}
template <typename U, typename Handler>
static bool check(types<U>, lua_State* L_, int index, type indextype, Handler&& handler, record& tracking) {
if constexpr (
std::is_same_v<T,
lightuserdata_value> || std::is_same_v<T, userdata_value> || std::is_same_v<T, userdata> || std::is_same_v<T, lightuserdata>) {
tracking.use(1);
if (indextype != type::userdata) {
handler(L_, index, type::userdata, indextype, "value is not a valid userdata");
return false;
}
return true;
}
else {
#if SOL_IS_ON(SOL_USE_INTEROP)
if (stack_detail::interop_check<U>(L_, index, indextype, handler, tracking)) {
return true;
}
#endif // interop extensibility
tracking.use(1);
#if SOL_IS_ON(SOL_GET_FUNCTION_POINTER_UNSAFE)
if (lua_iscfunction(L_, index) != 0) {
// a potential match...
return true;
}
#endif
if (indextype != type::userdata) {
handler(L_, index, type::userdata, indextype, "value is not a valid userdata");
return false;
}
if (lua_getmetatable(L_, index) == 0) {
return true;
}
int metatableindex = lua_gettop(L_);
if (stack_detail::check_metatable<U>(L_, metatableindex))
return true;
if (stack_detail::check_metatable<U*>(L_, metatableindex))
return true;
if (stack_detail::check_metatable<d::u<U>>(L_, metatableindex))
return true;
if (stack_detail::check_metatable<as_container_t<U>>(L_, metatableindex))
return true;
bool success = false;
bool has_derived = derive<T>::value || weak_derive<T>::value;
if (has_derived) {
#if SOL_IS_ON(SOL_SAFE_STACK_CHECK)
luaL_checkstack(L_, 1, detail::not_enough_stack_space_string);
#endif // make sure stack doesn't overflow
auto pn = stack::pop_n(L_, 1);
lua_pushstring(L_, &detail::base_class_check_key()[0]);
lua_rawget(L_, metatableindex);
if (type_of(L_, -1) != type::lua_nil) {
void* basecastdata = lua_touserdata(L_, -1);
detail::inheritance_check_function ic = reinterpret_cast<detail::inheritance_check_function>(basecastdata);
success = ic(usertype_traits<T>::qualified_name());
}
}
lua_pop(L_, 1);
if (!success) {
handler(L_, index, type::userdata, indextype, "value at this index does not properly reflect the desired type");
return false;
}
return true;
}
}
};
template <typename T>
struct unqualified_checker<detail::as_pointer_tag<T>, type::userdata> {
template <typename Handler>
static bool check(lua_State* L_, int index, type indextype, Handler&& handler, record& tracking) {
if (indextype == type::lua_nil) {
tracking.use(1);
return true;
}
return check_usertype<std::remove_pointer_t<T>>(L_, index, std::forward<Handler>(handler), tracking);
}
template <typename Handler>
static bool check(lua_State* L_, int index, Handler&& handler, record& tracking) {
const type indextype = type_of(L_, index);
return check(L_, index, indextype, std::forward<Handler>(handler), tracking);
}
};
template <typename T, std::size_t N, type expect>
struct unqualified_checker<exhaustive_until<T, N>, expect> {
template <typename K, typename V, typename Handler>
static bool check_two(types<K, V>, lua_State* arg_L, int relindex, type indextype, Handler&& handler, record& tracking) {
tracking.use(1);
#if SOL_IS_ON(SOL_SAFE_STACK_CHECK)
luaL_checkstack(arg_L, 3, detail::not_enough_stack_space_generic);
#endif // make sure stack doesn't overflow
int index = lua_absindex(arg_L, relindex);
lua_pushnil(arg_L);
while (lua_next(arg_L, index) != 0) {
const bool is_key_okay = stack::check<K>(arg_L, -2, std::forward<Handler>(handler), tracking);
if (!is_key_okay) {
lua_pop(arg_L, 2);
return false;
}
const bool is_value_okay = stack::check<V>(arg_L, -1, std::forward<Handler>(handler), tracking);
if (!is_value_okay) {
lua_pop(arg_L, 2);
return false;
}
lua_pop(arg_L, 1);
}
return true;
}
template <typename V, typename Handler>
static bool check_one(types<V>, lua_State* arg_L, int relindex, type, Handler&& handler, record& tracking) {
tracking.use(1);
size_t index = lua_absindex(arg_L, relindex);
// Zzzz slower but necessary thanks to the lower version API and missing functions qq
std::size_t idx = 0;
int vi = 0;
for (lua_Integer i = 0;; (void)(i += lua_size<V>::value), lua_pop(arg_L, static_cast<int>(vi))) {
vi = 0;
if (idx >= N) {
return true;
}
#if SOL_IS_ON(SOL_SAFE_STACK_CHECK)
luaL_checkstack(arg_L, 2, detail::not_enough_stack_space_generic);
#endif // make sure stack doesn't overflow
bool isnil = false;
for (; vi < static_cast<int>(lua_size<V>::value); ++vi) {
lua_pushinteger(arg_L, i);
lua_gettable(arg_L, static_cast<int>(index));
type vt = type_of(arg_L, -1);
isnil = vt == type::lua_nil;
if (isnil) {
if (i == 0) {
vi += 1;
goto loop_continue;
}
lua_pop(arg_L, static_cast<int>(vi + 1));
return true;
}
}
if (!stack::check<V>(arg_L, -lua_size<V>::value, std::forward<Handler>(handler), tracking)) {
lua_pop(arg_L, lua_size<V>::value);
return false;
}
++idx;
loop_continue:;
}
}
template <typename Handler>
static bool check(lua_State* arg_L, int index, Handler&& handler, record& tracking) {
using Tu = meta::unqualified_t<T>;
if constexpr (is_container_v<Tu>) {
if constexpr (meta::is_associative<Tu>::value) {
typedef typename Tu::value_type P;
typedef typename P::first_type K;
typedef typename P::second_type V;
return check_two(types<K, V>(), arg_L, index, expect, std::forward<Handler>(handler), tracking);
}
else {
typedef typename Tu::value_type V;
return check_one(types<V>(), arg_L, index, expect, std::forward<Handler>(handler), tracking);
}
}
else {
unqualified_checker<Tu, expect> c {};
return c.check(arg_L, index, std::forward<Handler>(handler), tracking);
}
}
};
template <typename T, type expect>
struct unqualified_checker<non_exhaustive<T>, expect> {
template <typename Handler>
static bool check(lua_State* arg_L, int index, Handler&& handler, record& tracking) {
return stack::check<T>(arg_L, index, std::forward<Handler>(handler), tracking);
}
};
template <typename... Args>
struct unqualified_checker<std::tuple<Args...>, type::poly> {
template <typename Handler>
static bool check(lua_State* L_, int index, Handler&& handler, record& tracking) {
return stack::multi_check<Args...>(L_, index, std::forward<Handler>(handler), tracking);
}
};
template <typename A, typename B>
struct unqualified_checker<std::pair<A, B>, type::poly> {
template <typename Handler>
static bool check(lua_State* L_, int index, Handler&& handler, record& tracking) {
return stack::multi_check<A, B>(L_, index, std::forward<Handler>(handler), tracking);
}
};
#if SOL_IS_ON(SOL_STD_VARIANT)
template <typename... Tn>
struct unqualified_checker<std::variant<Tn...>, type::poly> {
typedef std::variant<Tn...> V;
typedef std::variant_size<V> V_size;
typedef std::integral_constant<bool, V_size::value == 0> V_is_empty;
template <typename Handler>
static bool is_one(std::integral_constant<std::size_t, 0>, lua_State* L_, int index, Handler&& handler, record& tracking) {
if constexpr (V_is_empty::value) {
if (lua_isnone(L_, index)) {
return true;
}
}
tracking.use(1);
handler(L_, index, type::poly, type_of(L_, index), "value does not fit any type present in the variant");
return false;
}
template <std::size_t I, typename Handler>
static bool is_one(std::integral_constant<std::size_t, I>, lua_State* L_, int index, Handler&& handler, record& tracking) {
typedef std::variant_alternative_t<I - 1, V> T;
record temp_tracking = tracking;
if (stack::check<T>(L_, index, &no_panic, temp_tracking)) {
tracking = temp_tracking;
return true;
}
return is_one(std::integral_constant<std::size_t, I - 1>(), L_, index, std::forward<Handler>(handler), tracking);
}
template <typename Handler>
static bool check(lua_State* L_, int index, Handler&& handler, record& tracking) {
return is_one(std::integral_constant<std::size_t, V_size::value>(), L_, index, std::forward<Handler>(handler), tracking);
}
};
#endif // variant shenanigans
}} // namespace sol::stack
#endif // SOL_STACK_CHECK_UNQUALIFIED_HPP
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