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-rw-r--r--src/lib/util/coretmpl.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lib/util/coretmpl.h b/src/lib/util/coretmpl.h
index 55313a4a0f5..87f8cfbf09e 100644
--- a/src/lib/util/coretmpl.h
+++ b/src/lib/util/coretmpl.h
@@ -654,7 +654,7 @@ template <typename T, typename U, typename... V> constexpr T bitswap(T val, U b,
/// bit of the input. Specify bits in the order they should appear in
/// the output field, from most significant to least significant.
/// \return The extracted bits packed into a right-aligned field.
-template <unsigned B, typename T, typename... U> T bitswap(T val, U... b) noexcept
+template <unsigned B, typename T, typename... U> constexpr T bitswap(T val, U... b) noexcept
{
static_assert(sizeof...(b) == B, "wrong number of bits");
static_assert((sizeof(std::remove_reference_t<T>) * 8) >= B, "return type too small for result");