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#pragma once
#include "compat.h"
#include "macros_and_utils.h"
#include <bit>
// #################################################################################################
class UniqueKey
{
protected:
uintptr_t const m_storage{ 0 };
public:
char const* m_debugName{ nullptr };
// ---------------------------------------------------------------------------------------------
constexpr explicit UniqueKey(uint64_t val_, char const* debugName_ = nullptr)
#if LUAJIT_FLAVOR() == 64 // building against LuaJIT headers for 64 bits, light userdata is restricted to 47 significant bits, because LuaJIT uses the other bits for internal optimizations
: m_storage{ static_cast<uintptr_t>(val_ & 0x7FFFFFFFFFFFull) }
#else // LUAJIT_FLAVOR()
: m_storage{ static_cast<uintptr_t>(val_) }
#endif // LUAJIT_FLAVOR()
, m_debugName{ debugName_ }
{
}
// ---------------------------------------------------------------------------------------------
constexpr UniqueKey(UniqueKey const& rhs_) = default;
// ---------------------------------------------------------------------------------------------
constexpr std::strong_ordering operator<=>(UniqueKey const& rhs_) const = default;
// ---------------------------------------------------------------------------------------------
bool equals(lua_State* const L_, int i_) const
{
return lua_touserdata(L_, i_) == std::bit_cast<void*>(m_storage);
}
// ---------------------------------------------------------------------------------------------
void pushKey(lua_State* const L_) const
{
lua_pushlightuserdata(L_, std::bit_cast<void*>(m_storage));
}
};
// #################################################################################################
class RegistryUniqueKey : public UniqueKey
{
public:
using UniqueKey::UniqueKey;
// ---------------------------------------------------------------------------------------------
void pushValue(lua_State* const L_) const
{
STACK_CHECK_START_REL(L_, 0);
pushKey(L_);
lua_rawget(L_, LUA_REGISTRYINDEX);
STACK_CHECK(L_, 1);
}
// ---------------------------------------------------------------------------------------------
template <typename OP>
void setValue(lua_State* L_, OP operation_) const
{
// Note we can't check stack consistency because operation is not always a push (could be insert, replace, whatever)
pushKey(L_); // ... key
operation_(L_); // ... key value
lua_rawset(L_, LUA_REGISTRYINDEX); // ...
}
// ---------------------------------------------------------------------------------------------
template <typename T>
T* readLightUserDataValue(lua_State* const L_) const
{
STACK_GROW(L_, 1);
STACK_CHECK_START_REL(L_, 0);
pushValue(L_);
T* const value{ lua_tolightuserdata<T>(L_, -1) }; // lightuserdata/nil
lua_pop(L_, 1);
STACK_CHECK(L_, 0);
return value;
}
// ---------------------------------------------------------------------------------------------
bool readBoolValue(lua_State* const L_) const
{
STACK_GROW(L_, 1);
STACK_CHECK_START_REL(L_, 0);
pushValue(L_);
bool const value{ lua_toboolean(L_, -1) ? true : false}; // bool/nil
lua_pop(L_, 1);
STACK_CHECK(L_, 0);
return value;
}
};
// #################################################################################################
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