1 files changed, 13 insertions, 0 deletions
diff --git a/serialize/packbits-impl.hpp b/serialize/packbits-impl.hpp
new file mode 100644
index 00000000..3e57ea75
--- /dev/null
+++ b/serialize/packbits-impl.hpp
@@ -0,0 +1,13 @@
+#pragma once
+
+namespace floormat::Pack_impl {
+
+[[noreturn]] void throw_on_read_nonzero() noexcept(false);
+[[noreturn]] void throw_on_write_input_bit_overflow() noexcept(false);
+
+template<size_t... Ns> struct expand_sum;
+template<size_t N, size_t... Ns> struct expand_sum<N, Ns...> { static constexpr size_t value = N + expand_sum<Ns...>::value; };
+template<> struct expand_sum<> { static constexpr size_t value = 0; };
+template<size_t... Ns> constexpr inline size_t sum = expand_sum<Ns...>::value;
+
+} // namespace floormat::Pack_impl