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diff --git a/include/mcl/assert.hpp b/include/mcl/assert.hpp
index f77dbe7..9ec0b9c 100644
--- a/include/mcl/assert.hpp
+++ b/include/mcl/assert.hpp
@@ -23,8 +23,11 @@ template<typename... Ts>
} // namespace mcl::detail
+#ifndef UNREACHABLE
#define UNREACHABLE() ASSERT_FALSE("Unreachable code!")
+#endif
+#ifndef ASSERT
#define ASSERT(expr) \
[&] { \
if (std::is_constant_evaluated()) { \
@@ -37,7 +40,9 @@ template<typename... Ts>
} \
} \
}()
+#endif
+#ifndef ASSERT_MSG
#define ASSERT_MSG(expr, ...) \
[&] { \
if (std::is_constant_evaluated()) { \
@@ -50,13 +55,24 @@ template<typename... Ts>
} \
} \
}()
+#endif
+#ifndef ASSERT_FALSE
#define ASSERT_FALSE(...) ::mcl::detail::assert_terminate("false", __VA_ARGS__)
+#endif
#if defined(NDEBUG) || defined(MCL_IGNORE_ASSERTS)
-# define DEBUG_ASSERT(expr) ASSUME(expr)
-# define DEBUG_ASSERT_MSG(expr, ...) ASSUME(expr)
+# ifndef DEBUG_ASSERT
+# define DEBUG_ASSERT(expr) ASSUME(expr)
+# endif
+# ifndef DEBUG_ASSERT_MSG
+# define DEBUG_ASSERT_MSG(expr, ...) ASSUME(expr)
+# endif
#else
-# define DEBUG_ASSERT(expr) ASSERT(expr)
-# define DEBUG_ASSERT_MSG(expr, ...) ASSERT_MSG(expr, __VA_ARGS__)
+# ifndef DEBUG_ASSERT
+# define DEBUG_ASSERT(expr) ASSERT(expr)
+# endif
+# ifndef DEBUG_ASSERT_MSG
+# define DEBUG_ASSERT_MSG(expr, ...) ASSERT_MSG(expr, __VA_ARGS__)
+# endif
#endif
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