[COMMIT seastar master] core/bitops.hh: add type constraits to templates

[Commit Bot]

From: Kefu Chai <kefu...@scylladb.com>
Committer: Avi Kivity <a...@scylladb.com>
Branch: master

core/bitops.hh: add type constraits to templates

for better readability and better developer experience

Signed-off-by: Kefu Chai <kefu...@scylladb.com>

---
diff --git a/include/seastar/core/bitops.hh b/include/seastar/core/bitops.hh
--- a/include/seastar/core/bitops.hh
+++ b/include/seastar/core/bitops.hh
@@ -22,6 +22,8 @@
#pragma once

#include <limits>
+#include <type_traits>
+#include <seastar/util/concepts.hh>

namespace seastar {

@@ -56,7 +58,7 @@ constexpr unsigned count_trailing_zeros(unsigned long long x) {
}

template<typename T>
-//requires stdx::is_integral_v<T>
+SEASTAR_CONCEPT( requires std::is_integral_v<T> )
inline constexpr unsigned log2ceil(T n) {
if (n == 1) {
return 0;
@@ -65,7 +67,7 @@ inline constexpr unsigned log2ceil(T n) {
}

template<typename T>
-//requires stdx::is_integral_v<T>
+SEASTAR_CONCEPT( requires std::is_integral_v<T> )
inline constexpr unsigned log2floor(T n) {
return std::numeric_limits<T>::digits - count_leading_zeros(n) - 1;
}