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sol/stack_push.hpp~RF9798847.TMP
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// 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>
namespace sol {
namespace stack {
template<typename T, typename>
struct pusher {
template <typename... Args>
static int push(lua_State* L, 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)...);
luaL_newmetatable(L, &usertype_traits<T>::metatable[0]);
lua_setmetatable(L, -2);
return 1;
}
};
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>
struct pusher<T*> {
static int push(lua_State* L, T* obj) {
if (obj == nullptr)
return stack::push(L, nil);
T** pref = static_cast<T**>(lua_newuserdata(L, sizeof(T*)));
*pref = obj;
luaL_getmetatable(L, &usertype_traits<T*>::metatable[0]);
lua_setmetatable(L, -2);
return 1;
}
};
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::EnableIf<std::is_base_of<Real, meta::Unqualified<Arg>>> = 0>
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::And<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<meta::And<std::is_integral<T>, std::is_unsigned<T>>::value>> {
static int push(lua_State* L, const T& value) {
typedef std::make_signed_t<T> signed_int;
return stack::push(L, static_cast<signed_int>(value));
}
};
template<typename T>
struct pusher<T, std::enable_if_t<meta::And<meta::has_begin_end<T>, meta::Not<meta::has_key_value_pair<T>>, meta::Not<std::is_base_of<reference, T>>>::value>> {
static int push(lua_State* L, const T& cont) {
lua_createtable(L, static_cast<int>(cont.size()), 0);
int tableindex = lua_gettop(L);
unsigned index = 1;
for(auto&& i : cont) {
set_field(L, index++, i, tableindex);
}
return 1;
}
};
template<typename T>
struct pusher<T, std::enable_if_t<meta::And<meta::has_begin_end<T>, meta::has_key_value_pair<T>, meta::Not<std::is_base_of<reference, T>>>::value>> {
static int push(lua_State* L, const T& cont) {
lua_createtable(L, static_cast<int>(cont.size()), 0);
int tableindex = lua_gettop(L);
for(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*, 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 closure) {
lua_pushcclosure(L, closure.c_function, closure.upvalues);
return 1;
}
};
template<>
struct pusher<void*> {
static int push(lua_State* L, void* userdata) {
lua_pushlightuserdata(L, userdata);
return 1;
}
};
template<>
struct pusher<light_userdata_value> {
static int push(lua_State* L, light_userdata_value userdata) {
lua_pushlightuserdata(L, userdata);
return 1;
}
};
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(lua_State* L, const char* str) {
lua_pushlstring(L, str, std::char_traits<char>::length(str));
return 1;
}
};
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;
}
};
template <>
struct pusher<char> {
static int push(lua_State* L, char c) {
const char str[2] = { c, '\0'};
return stack::push(L, str);
}
};
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;
}
};
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<this_state> {
static int push(lua_State*, const this_state&) {
return 0;
}
};
} // stack
} // sol
#endif // SOL_STACK_PUSH_HPP