2 files changed, 90 insertions, 0 deletions
diff --git a/include/atp/utils/hash_utils.h b/include/atp/utils/hash_utils.h
new file mode 100644
index 0000000..4531fa6
--- /dev/null
+++ b/include/atp/utils/hash_utils.h
@@ -0,0 +1,47 @@
+/*
+ * 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 hash_utils.h
+/// @brief Hash combination utilities.
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+
+namespace atp {
+
+/// Combine a hash with a new value (boost::hash_combine style).
+inline void hashCombine(size_t& seed, size_t value) {
+    seed ^= value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+}
+
+/// Hash a span of values.
+template <typename T>
+size_t hashRange(const T* data, size_t count) {
+    size_t seed = 0;
+    std::hash<T> hasher;
+    for (size_t i = 0; i < count; ++i) {
+        hashCombine(seed, hasher(data[i]));
+    }
+    return seed;
+}
+
+}  // namespace atp
diff --git a/include/atp/utils/logger.h b/include/atp/utils/logger.h
new file mode 100644
index 0000000..95d3dd2
--- /dev/null
+++ b/include/atp/utils/logger.h
@@ -0,0 +1,43 @@
+/*
+ * 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 logger.h
+/// @brief Minimal high-performance logging macros.
+
+#include <cstdio>
+
+#ifndef ATP_LOG_LEVEL
+#define ATP_LOG_LEVEL 2  // 0=TRACE, 1=DEBUG, 2=INFO, 3=WARN, 4=ERROR
+#endif
+
+#define ATP_LOG(level, level_str, fmt, ...)                        \
+    do {                                                           \
+        if constexpr (level >= ATP_LOG_LEVEL) {                    \
+            std::fprintf(stderr, "[%s] " fmt "\n", level_str,     \
+                         ##__VA_ARGS__);                           \
+        }                                                          \
+    } while (0)
+
+#define ATP_TRACE(fmt, ...) ATP_LOG(0, "TRACE", fmt, ##__VA_ARGS__)
+#define ATP_DEBUG(fmt, ...) ATP_LOG(1, "DEBUG", fmt, ##__VA_ARGS__)
+#define ATP_INFO(fmt, ...)  ATP_LOG(2, "INFO",  fmt, ##__VA_ARGS__)
+#define ATP_WARN(fmt, ...)  ATP_LOG(3, "WARN",  fmt, ##__VA_ARGS__)
+#define ATP_ERROR(fmt, ...) ATP_LOG(4, "ERROR", fmt, ##__VA_ARGS__)