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/*
* richard-atp-engine: A saturation-based automated theorem prover for first-order logic.
* Copyright (C) 2026 Richard Qin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
/// @file term.h
/// @brief Core Term data structure — hash-consed, immutable.
///
/// V1 uses vector<TermId> for args.
/// Future: flat arena with contiguous arg storage for cache locality.
#include <vector>
#include "atp/core/types.h"
namespace atp {
/// A term is a function/predicate application: f(t1, t2, ..., tn).
/// Variables are 0-arity terms whose symbol has SymbolKind::kVariable.
struct Term {
SymbolId symbol_id; ///< Index into the SymbolTable
std::vector<TermId> args; ///< Argument sub-term IDs
/// Number of arguments.
[[nodiscard]] uint16_t arity() const {
return static_cast<uint16_t>(args.size());
}
};
} // namespace atp
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