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author Miodrag Milanovic <mmicko@gmail.com>2016-10-07 14:43:09 +0200
committer Miodrag Milanovic <mmicko@gmail.com>2016-10-07 14:43:09 +0200
commit377472a6dd2c9bdff4d5667f5789c49aee2abb4c (patch)
treea0ce4d6fc3db1524609efc61307d48448e703f38 /3rdparty/sol2/sol/stack_push.hpp
parent1335933ce00cf6095e403a24d0b1dd9e0b565650 (diff)
Added sol2 header only library as future replacement for luabridge (nw)
Diffstat (limited to '3rdparty/sol2/sol/stack_push.hpp')
-rw-r--r--3rdparty/sol2/sol/stack_push.hpp693
1 files changed, 693 insertions, 0 deletions
diff --git a/3rdparty/sol2/sol/stack_push.hpp b/3rdparty/sol2/sol/stack_push.hpp
new file mode 100644
index 00000000000..27d28fc081e
--- /dev/null
+++ b/3rdparty/sol2/sol/stack_push.hpp
@@ -0,0 +1,693 @@
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2016 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_PUSH_HPP
+#define SOL_STACK_PUSH_HPP
+
+#include "stack_core.hpp"
+#include "raii.hpp"
+#include "optional.hpp"
+#include <memory>
+#ifdef SOL_CODECVT_SUPPORT
+#include <codecvt>
+#include <locale>
+#endif
+
+namespace sol {
+ namespace stack {
+ template <typename T>
+ struct pusher<detail::as_value_tag<T>> {
+ template <typename F, typename... Args>
+ static int push_fx(lua_State* L, F&& f, Args&&... args) {
+ // Basically, we store all user-data like this:
+ // If it's a movable/copyable value (no std::ref(x)), then we store the pointer to the new
+ // data in the first sizeof(T*) bytes, and then however many bytes it takes to
+ // do the actual object. Things that are std::ref or plain T* are stored as
+ // just the sizeof(T*), and nothing else.
+ T** pointerpointer = static_cast<T**>(lua_newuserdata(L, sizeof(T*) + sizeof(T)));
+ T*& referencereference = *pointerpointer;
+ T* allocationtarget = reinterpret_cast<T*>(pointerpointer + 1);
+ referencereference = allocationtarget;
+ std::allocator<T> alloc{};
+ alloc.construct(allocationtarget, std::forward<Args>(args)...);
+ f();
+ return 1;
+ }
+
+ template <typename K, typename... Args>
+ static int push_keyed(lua_State* L, K&& k, Args&&... args) {
+ return push_fx(L, [&L, &k]() {
+ luaL_newmetatable(L, &k[0]);
+ lua_setmetatable(L, -2);
+ }, std::forward<Args>(args)...);
+ }
+
+ template <typename... Args>
+ static int push(lua_State* L, Args&&... args) {
+ return push_keyed(L, usertype_traits<T>::metatable, std::forward<Args>(args)...);
+ }
+ };
+
+ template <typename T>
+ struct pusher<detail::as_pointer_tag<T>> {
+ template <typename F>
+ static int push_fx(lua_State* L, F&& f, T* obj) {
+ if (obj == nullptr)
+ return stack::push(L, nil);
+ T** pref = static_cast<T**>(lua_newuserdata(L, sizeof(T*)));
+ *pref = obj;
+ f();
+ return 1;
+ }
+
+ template <typename K>
+ static int push_keyed(lua_State* L, K&& k, T* obj) {
+ return push_fx(L, [&L, &k]() {
+ luaL_newmetatable(L, &k[0]);
+ lua_setmetatable(L, -2);
+ }, obj);
+ }
+
+ static int push(lua_State* L, T* obj) {
+ return push_keyed(L, usertype_traits<meta::unqualified_t<T>*>::metatable, obj);
+ }
+ };
+
+ template <>
+ struct pusher<detail::as_reference_tag> {
+ template <typename T>
+ static int push(lua_State* L, T&& obj) {
+ return stack::push(L, detail::ptr(obj));
+ }
+ };
+
+ template<typename T, typename>
+ struct pusher {
+ template <typename... Args>
+ static int push(lua_State* L, Args&&... args) {
+ return pusher<detail::as_value_tag<T>>{}.push(L, std::forward<Args>(args)...);
+ }
+ };
+
+ template<typename T>
+ struct pusher<T*, meta::disable_if_t<meta::all<meta::has_begin_end<meta::unqualified_t<T>>, meta::neg<meta::any<std::is_base_of<reference, meta::unqualified_t<T>>, std::is_base_of<stack_reference, meta::unqualified_t<T>>>>>::value>> {
+ template <typename... Args>
+ static int push(lua_State* L, Args&&... args) {
+ return pusher<detail::as_pointer_tag<T>>{}.push(L, std::forward<Args>(args)...);
+ }
+ };
+
+ template<typename T>
+ struct pusher<T, std::enable_if_t<is_unique_usertype<T>::value>> {
+ typedef typename unique_usertype_traits<T>::type P;
+ typedef typename unique_usertype_traits<T>::actual_type Real;
+
+ template <typename Arg, meta::enable<std::is_base_of<Real, meta::unqualified_t<Arg>>> = meta::enabler>
+ static int push(lua_State* L, Arg&& arg) {
+ if (unique_usertype_traits<T>::is_null(arg))
+ return stack::push(L, nil);
+ return push_deep(L, std::forward<Arg>(arg));
+ }
+
+ template <typename Arg0, typename Arg1, typename... Args>
+ static int push(lua_State* L, Arg0&& arg0, Arg0&& arg1, Args&&... args) {
+ return push_deep(L, std::forward<Arg0>(arg0), std::forward<Arg1>(arg1), std::forward<Args>(args)...);
+ }
+
+ template <typename... Args>
+ static int push_deep(lua_State* L, Args&&... args) {
+ P** pref = static_cast<P**>(lua_newuserdata(L, sizeof(P*) + sizeof(detail::special_destruct_func) + sizeof(Real)));
+ detail::special_destruct_func* fx = static_cast<detail::special_destruct_func*>(static_cast<void*>(pref + 1));
+ Real* mem = static_cast<Real*>(static_cast<void*>(fx + 1));
+ *fx = detail::special_destruct<P, Real>;
+ detail::default_construct::construct(mem, std::forward<Args>(args)...);
+ *pref = unique_usertype_traits<T>::get(*mem);
+ if (luaL_newmetatable(L, &usertype_traits<detail::unique_usertype<P>>::metatable[0]) == 1) {
+ set_field(L, "__gc", detail::unique_destruct<P>);
+ }
+ lua_setmetatable(L, -2);
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<std::reference_wrapper<T>> {
+ static int push(lua_State* L, const std::reference_wrapper<T>& t) {
+ return stack::push(L, std::addressof(detail::deref(t.get())));
+ }
+ };
+
+ template<typename T>
+ struct pusher<T, std::enable_if_t<std::is_floating_point<T>::value>> {
+ static int push(lua_State* L, const T& value) {
+ lua_pushnumber(L, value);
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<T, std::enable_if_t<meta::all<std::is_integral<T>, std::is_signed<T>>::value>> {
+ static int push(lua_State* L, const T& value) {
+ lua_pushinteger(L, static_cast<lua_Integer>(value));
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<T, std::enable_if_t<std::is_enum<T>::value>> {
+ static int push(lua_State* L, const T& value) {
+ if (std::is_same<char, T>::value) {
+ return stack::push(L, static_cast<int>(value));
+ }
+ return stack::push(L, static_cast<std::underlying_type_t<T>>(value));
+ }
+ };
+
+ template<typename T>
+ struct pusher<T, std::enable_if_t<meta::all<std::is_integral<T>, std::is_unsigned<T>>::value>> {
+ static int push(lua_State* L, const T& value) {
+ lua_pushinteger(L, static_cast<lua_Integer>(value));
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<as_table_t<T>, std::enable_if_t<!meta::has_key_value_pair<meta::unqualified_t<std::remove_pointer_t<T>>>::value>> {
+ static int push(lua_State* L, const as_table_t<T>& tablecont) {
+ auto& cont = detail::deref(detail::unwrap(tablecont.source));
+ lua_createtable(L, static_cast<int>(cont.size()), 0);
+ int tableindex = lua_gettop(L);
+ std::size_t index = 1;
+ for (const auto& i : cont) {
+#if SOL_LUA_VERSION >= 503
+ int p = stack::push(L, i);
+ for (int pi = 0; pi < p; ++pi) {
+ lua_seti(L, tableindex, static_cast<lua_Integer>(index++));
+ }
+#else
+ lua_pushinteger(L, static_cast<lua_Integer>(index));
+ int p = stack::push(L, i);
+ if (p == 1) {
+ ++index;
+ lua_settable(L, tableindex);
+ }
+ else {
+ int firstindex = tableindex + 1 + 1;
+ for (int pi = 0; pi < p; ++pi) {
+ stack::push(L, index);
+ lua_pushvalue(L, firstindex);
+ lua_settable(L, tableindex);
+ ++index;
+ ++firstindex;
+ }
+ lua_pop(L, 1 + p);
+ }
+#endif
+ }
+ // TODO: figure out a better way to do this...?
+ //set_field(L, -1, cont.size());
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<as_table_t<T>, std::enable_if_t<meta::has_key_value_pair<meta::unqualified_t<std::remove_pointer_t<T>>>::value>> {
+ static int push(lua_State* L, const as_table_t<T>& tablecont) {
+ auto& cont = detail::deref(detail::unwrap(tablecont.source));
+ lua_createtable(L, static_cast<int>(cont.size()), 0);
+ int tableindex = lua_gettop(L);
+ for (const auto& pair : cont) {
+ set_field(L, pair.first, pair.second, tableindex);
+ }
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<T, std::enable_if_t<std::is_base_of<reference, T>::value || std::is_base_of<stack_reference, T>::value>> {
+ static int push(lua_State*, const T& ref) {
+ return ref.push();
+ }
+
+ static int push(lua_State*, T&& ref) {
+ return ref.push();
+ }
+ };
+
+ template<>
+ struct pusher<bool> {
+ static int push(lua_State* L, bool b) {
+ lua_pushboolean(L, b);
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<nil_t> {
+ static int push(lua_State* L, nil_t) {
+ lua_pushnil(L);
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<metatable_key_t> {
+ static int push(lua_State* L, metatable_key_t) {
+ lua_pushlstring(L, "__mt", 4);
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<std::remove_pointer_t<lua_CFunction>> {
+ static int push(lua_State* L, lua_CFunction func, int n = 0) {
+ lua_pushcclosure(L, func, n);
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<lua_CFunction> {
+ static int push(lua_State* L, lua_CFunction func, int n = 0) {
+ lua_pushcclosure(L, func, n);
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<c_closure> {
+ static int push(lua_State* L, c_closure cc) {
+ lua_pushcclosure(L, cc.c_function, cc.upvalues);
+ return 1;
+ }
+ };
+
+ template<typename Arg, typename... Args>
+ struct pusher<closure<Arg, Args...>> {
+ template <std::size_t... I, typename T>
+ static int push(std::index_sequence<I...>, lua_State* L, T&& c) {
+ int pushcount = multi_push(L, detail::forward_get<I>(c.upvalues)...);
+ return stack::push(L, c_closure(c.c_function, pushcount));
+ }
+
+ template <typename T>
+ static int push(lua_State* L, T&& c) {
+ return push(std::make_index_sequence<1 + sizeof...(Args)>(), L, std::forward<T>(c));
+ }
+ };
+
+ template<>
+ struct pusher<void*> {
+ static int push(lua_State* L, void* userdata) {
+ lua_pushlightuserdata(L, userdata);
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<lightuserdata_value> {
+ static int push(lua_State* L, lightuserdata_value userdata) {
+ lua_pushlightuserdata(L, userdata);
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<light<T>> {
+ static int push(lua_State* L, light<T> l) {
+ lua_pushlightuserdata(L, static_cast<void*>(l.value));
+ return 1;
+ }
+ };
+
+ template<typename T>
+ struct pusher<user<T>> {
+ template <bool with_meta = true, typename Key, typename... Args>
+ static int push_with(lua_State* L, Key&& name, Args&&... args) {
+ // A dumb pusher
+ void* rawdata = lua_newuserdata(L, sizeof(T));
+ T* data = static_cast<T*>(rawdata);
+ std::allocator<T> alloc;
+ alloc.construct(data, std::forward<Args>(args)...);
+ if (with_meta) {
+ lua_CFunction cdel = detail::user_alloc_destroy<T>;
+ // Make sure we have a plain GC set for this data
+ if (luaL_newmetatable(L, name) != 0) {
+ lua_pushlightuserdata(L, rawdata);
+ lua_pushcclosure(L, cdel, 1);
+ lua_setfield(L, -2, "__gc");
+ }
+ lua_setmetatable(L, -2);
+ }
+ return 1;
+ }
+
+ template <typename Arg, typename... Args, meta::disable<meta::any_same<meta::unqualified_t<Arg>, no_metatable_t, metatable_key_t>> = meta::enabler>
+ static int push(lua_State* L, Arg&& arg, Args&&... args) {
+ const auto name = &usertype_traits<meta::unqualified_t<T>>::user_gc_metatable[0];
+ return push_with(L, name, std::forward<Arg>(arg), std::forward<Args>(args)...);
+ }
+
+ template <typename... Args>
+ static int push(lua_State* L, no_metatable_t, Args&&... args) {
+ const auto name = &usertype_traits<meta::unqualified_t<T>>::user_gc_metatable[0];
+ return push_with<false>(L, name, std::forward<Args>(args)...);
+ }
+
+ template <typename Key, typename... Args>
+ static int push(lua_State* L, metatable_key_t, Key&& key, Args&&... args) {
+ const auto name = &key[0];
+ return push_with<true>(L, name, std::forward<Args>(args)...);
+ }
+
+ static int push(lua_State* L, const user<T>& u) {
+ const auto name = &usertype_traits<meta::unqualified_t<T>>::user_gc_metatable[0];
+ return push_with(L, name, u.value);
+ }
+
+ static int push(lua_State* L, user<T>&& u) {
+ const auto name = &usertype_traits<meta::unqualified_t<T>>::user_gc_metatable[0];
+ return push_with(L, name, std::move(u.value));
+ }
+
+ static int push(lua_State* L, no_metatable_t, const user<T>& u) {
+ const auto name = &usertype_traits<meta::unqualified_t<T>>::user_gc_metatable[0];
+ return push_with<false>(L, name, u.value);
+ }
+
+ static int push(lua_State* L, no_metatable_t, user<T>&& u) {
+ const auto name = &usertype_traits<meta::unqualified_t<T>>::user_gc_metatable[0];
+ return push_with<false>(L, name, std::move(u.value));
+ }
+ };
+
+ template<>
+ struct pusher<userdata_value> {
+ static int push(lua_State* L, userdata_value data) {
+ void** ud = static_cast<void**>(lua_newuserdata(L, sizeof(void*)));
+ *ud = data.value;
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<const char*> {
+ static int push_sized(lua_State* L, const char* str, std::size_t len) {
+ lua_pushlstring(L, str, len);
+ return 1;
+ }
+
+ static int push(lua_State* L, const char* str) {
+ return push_sized(L, str, std::char_traits<char>::length(str));
+ }
+
+ static int push(lua_State* L, const char* strb, const char* stre) {
+ return push_sized(L, strb, stre - strb);
+ }
+
+ static int push(lua_State* L, const char* str, std::size_t len) {
+ return push_sized(L, str, len);
+ }
+ };
+
+ template<size_t N>
+ struct pusher<char[N]> {
+ static int push(lua_State* L, const char(&str)[N]) {
+ lua_pushlstring(L, str, N - 1);
+ return 1;
+ }
+
+ static int push(lua_State* L, const char(&str)[N], std::size_t sz) {
+ lua_pushlstring(L, str, sz);
+ return 1;
+ }
+ };
+
+ template <>
+ struct pusher<char> {
+ static int push(lua_State* L, char c) {
+ const char str[2] = { c, '\0' };
+ return stack::push(L, str, 1);
+ }
+ };
+
+ template<>
+ struct pusher<std::string> {
+ static int push(lua_State* L, const std::string& str) {
+ lua_pushlstring(L, str.c_str(), str.size());
+ return 1;
+ }
+
+ static int push(lua_State* L, const std::string& str, std::size_t sz) {
+ lua_pushlstring(L, str.c_str(), sz);
+ return 1;
+ }
+ };
+
+ template<>
+ struct pusher<meta_function> {
+ static int push(lua_State* L, meta_function m) {
+ const std::string& str = name_of(m);
+ lua_pushlstring(L, str.c_str(), str.size());
+ return 1;
+ }
+ };
+
+#ifdef SOL_CODECVT_SUPPORT
+ template<>
+ struct pusher<const wchar_t*> {
+ static int push(lua_State* L, const wchar_t* wstr) {
+ return push(L, wstr, std::char_traits<wchar_t>::length(wstr));
+ }
+
+ static int push(lua_State* L, const wchar_t* wstr, std::size_t sz) {
+ return push(L, wstr, wstr + sz);
+ }
+
+ static int push(lua_State* L, const wchar_t* strb, const wchar_t* stre) {
+ if (sizeof(wchar_t) == 2) {
+ std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> convert;
+ std::string u8str = convert.to_bytes(strb, stre);
+ return stack::push(L, u8str);
+ }
+ std::wstring_convert<std::codecvt_utf8<wchar_t>> convert;
+ std::string u8str = convert.to_bytes(strb, stre);
+ return stack::push(L, u8str);
+ }
+ };
+
+ template<>
+ struct pusher<const char16_t*> {
+ static int push(lua_State* L, const char16_t* u16str) {
+ return push(L, u16str, std::char_traits<char16_t>::length(u16str));
+ }
+
+ static int push(lua_State* L, const char16_t* u16str, std::size_t sz) {
+ return push(L, u16str, u16str + sz);
+ }
+
+ static int push(lua_State* L, const char16_t* strb, const char16_t* stre) {
+#ifdef _MSC_VER
+ std::wstring_convert<std::codecvt_utf8_utf16<int16_t>, int16_t> convert;
+ std::string u8str = convert.to_bytes(reinterpret_cast<const int16_t*>(strb), reinterpret_cast<const int16_t*>(stre));
+#else
+ std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
+ std::string u8str = convert.to_bytes(strb, stre);
+#endif // VC++ is a shit
+ return stack::push(L, u8str);
+ }
+ };
+
+ template<>
+ struct pusher<const char32_t*> {
+ static int push(lua_State* L, const char32_t* u32str) {
+ return push(L, u32str, u32str + std::char_traits<char32_t>::length(u32str));
+ }
+
+ static int push(lua_State* L, const char32_t* u32str, std::size_t sz) {
+ return push(L, u32str, u32str + sz);
+ }
+
+ static int push(lua_State* L, const char32_t* strb, const char32_t* stre) {
+#ifdef _MSC_VER
+ std::wstring_convert<std::codecvt_utf8<int32_t>, int32_t> convert;
+ std::string u8str = convert.to_bytes(reinterpret_cast<const int32_t*>(strb), reinterpret_cast<const int32_t*>(stre));
+#else
+ std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> convert;
+ std::string u8str = convert.to_bytes(strb, stre);
+#endif // VC++ is a shit
+ return stack::push(L, u8str);
+ }
+ };
+
+ template<size_t N>
+ struct pusher<wchar_t[N]> {
+ static int push(lua_State* L, const wchar_t(&str)[N]) {
+ return push(L, str, N - 1);
+ }
+
+ static int push(lua_State* L, const wchar_t(&str)[N], std::size_t sz) {
+ return stack::push<const wchar_t*>(L, str, str + sz);
+ }
+ };
+
+ template<size_t N>
+ struct pusher<char16_t[N]> {
+ static int push(lua_State* L, const char16_t(&str)[N]) {
+ return push(L, str, N - 1);
+ }
+
+ static int push(lua_State* L, const char16_t(&str)[N], std::size_t sz) {
+ return stack::push<const char16_t*>(L, str, str + sz);
+ }
+ };
+
+ template<size_t N>
+ struct pusher<char32_t[N]> {
+ static int push(lua_State* L, const char32_t(&str)[N]) {
+ return push(L, str, N - 1);
+ }
+
+ static int push(lua_State* L, const char32_t(&str)[N], std::size_t sz) {
+ return stack::push<const char32_t*>(L, str, str + sz);
+ }
+ };
+
+ template <>
+ struct pusher<wchar_t> {
+ static int push(lua_State* L, wchar_t c) {
+ const wchar_t str[2] = { c, '\0' };
+ return stack::push(L, str, 1);
+ }
+ };
+
+ template <>
+ struct pusher<char16_t> {
+ static int push(lua_State* L, char16_t c) {
+ const char16_t str[2] = { c, '\0' };
+ return stack::push(L, str, 1);
+ }
+ };
+
+ template <>
+ struct pusher<char32_t> {
+ static int push(lua_State* L, char32_t c) {
+ const char32_t str[2] = { c, '\0' };
+ return stack::push(L, str, 1);
+ }
+ };
+
+ template<>
+ struct pusher<std::wstring> {
+ static int push(lua_State* L, const std::wstring& wstr) {
+ return push(L, wstr.data(), wstr.size());
+ }
+
+ static int push(lua_State* L, const std::wstring& wstr, std::size_t sz) {
+ return stack::push(L, wstr.data(), wstr.data() + sz);
+ }
+ };
+
+ template<>
+ struct pusher<std::u16string> {
+ static int push(lua_State* L, const std::u16string& u16str) {
+ return push(L, u16str, u16str.size());
+ }
+
+ static int push(lua_State* L, const std::u16string& u16str, std::size_t sz) {
+ return stack::push(L, u16str.data(), u16str.data() + sz);
+ }
+ };
+
+ template<>
+ struct pusher<std::u32string> {
+ static int push(lua_State* L, const std::u32string& u32str) {
+ return push(L, u32str, u32str.size());
+ }
+
+ static int push(lua_State* L, const std::u32string& u32str, std::size_t sz) {
+ return stack::push(L, u32str.data(), u32str.data() + sz);
+ }
+ };
+#endif // codecvt Header Support
+
+ template<typename... Args>
+ struct pusher<std::tuple<Args...>> {
+ template <std::size_t... I, typename T>
+ static int push(std::index_sequence<I...>, lua_State* L, T&& t) {
+ int pushcount = 0;
+ (void)detail::swallow{ 0, (pushcount += stack::push(L,
+ detail::forward_get<I>(t)
+ ), 0)... };
+ return pushcount;
+ }
+
+ template <typename T>
+ static int push(lua_State* L, T&& t) {
+ return push(std::index_sequence_for<Args...>(), L, std::forward<T>(t));
+ }
+ };
+
+ template<typename A, typename B>
+ struct pusher<std::pair<A, B>> {
+ template <typename T>
+ static int push(lua_State* L, T&& t) {
+ int pushcount = stack::push(L, detail::forward_get<0>(t));
+ pushcount += stack::push(L, detail::forward_get<1>(t));
+ return pushcount;
+ }
+ };
+
+ template<typename O>
+ struct pusher<optional<O>> {
+ template <typename T>
+ static int push(lua_State* L, T&& t) {
+ if (t == nullopt) {
+ return stack::push(L, nullopt);
+ }
+ return stack::push(L, t.value());
+ }
+ };
+
+ template<>
+ struct pusher<nullopt_t> {
+ static int push(lua_State* L, nullopt_t) {
+ return stack::push(L, nil);
+ }
+ };
+
+ template<>
+ struct pusher<std::nullptr_t> {
+ static int push(lua_State* L, std::nullptr_t) {
+ return stack::push(L, nil);
+ }
+ };
+
+ template<>
+ struct pusher<this_state> {
+ static int push(lua_State*, const this_state&) {
+ return 0;
+ }
+ };
+ } // stack
+} // sol
+
+#endif // SOL_STACK_PUSH_HPP