lua_callback.hpp

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#pragma once
 
#include <cstdint>
#include <functional>
#include <lua.hpp>
#include <luabridge3/LuaBridge/LuaBridge.h>
#include <memory>
#include <optional>
#include <string>
#include <toast/export.hpp>
 
namespace scripting {
 
class TOAST_API LuaCallback {
public:
  LuaCallback() = default;

  [[nodiscard]]
  static auto capture(const luabridge::LuaRef& fn, std::string name = {}) -> LuaCallback;
 
  [[nodiscard]]
  explicit operator bool() const noexcept {
    return m_shared != nullptr;
  }

  [[nodiscard]]
  auto alive() const noexcept -> bool;

  [[nodiscard]]
  auto invoke() const noexcept -> bool;

  [[nodiscard]]
  auto invokeBool() const noexcept -> std::optional<bool>;

  [[nodiscard]]
  auto invokeWithArgument(const std::function<void(lua_State*)>& push_argument) const noexcept -> std::optional<bool>;
 
private:
  struct Shared;
  explicit LuaCallback(std::shared_ptr<Shared> shared) noexcept;

  auto execute(
      const std::function<void(lua_State*)>* push_argument, bool want_result, std::optional<bool>& result, bool allow_queue
  ) const noexcept -> bool;
 
  std::shared_ptr<Shared> m_shared;
};
 
}