From 5cf246c4e12edfd295c9d043092717e50d2d4bdc Mon Sep 17 00:00:00 2001
From: zhaoshihan <zhao_shihan@foxmail.com>
Date: Sat, 27 Sep 2025 16:33:16 +0800
Subject: [PATCH] Fix warning -Wconstexpr-not-const

---
 src/contrib/dragonbox.h | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/src/contrib/dragonbox.h b/src/contrib/dragonbox.h
index 499a1576e..de5a79f11 100644
--- a/src/contrib/dragonbox.h
+++ b/src/contrib/dragonbox.h
@@ -4023,44 +4023,44 @@ namespace jkj {
 
             // Policy kind detectors.
             struct is_sign_policy {
-                constexpr bool operator()(...) noexcept { return false; }
+                constexpr bool operator()(...) const noexcept { return false; }
                 template <class Policy, class = typename Policy::sign_policy>
-                constexpr bool operator()(dummy<Policy>) noexcept {
+                constexpr bool operator()(dummy<Policy>) const noexcept {
                     return true;
                 }
             };
             struct is_trailing_zero_policy {
-                constexpr bool operator()(...) noexcept { return false; }
+                constexpr bool operator()(...) const noexcept { return false; }
                 template <class Policy, class = typename Policy::trailing_zero_policy>
-                constexpr bool operator()(dummy<Policy>) noexcept {
+                constexpr bool operator()(dummy<Policy>) const noexcept {
                     return true;
                 }
             };
             struct is_decimal_to_binary_rounding_policy {
-                constexpr bool operator()(...) noexcept { return false; }
+                constexpr bool operator()(...) const noexcept { return false; }
                 template <class Policy, class = typename Policy::decimal_to_binary_rounding_policy>
-                constexpr bool operator()(dummy<Policy>) noexcept {
+                constexpr bool operator()(dummy<Policy>) const noexcept {
                     return true;
                 }
             };
             struct is_binary_to_decimal_rounding_policy {
-                constexpr bool operator()(...) noexcept { return false; }
+                constexpr bool operator()(...) const noexcept { return false; }
                 template <class Policy, class = typename Policy::binary_to_decimal_rounding_policy>
-                constexpr bool operator()(dummy<Policy>) noexcept {
+                constexpr bool operator()(dummy<Policy>) const noexcept {
                     return true;
                 }
             };
             struct is_cache_policy {
-                constexpr bool operator()(...) noexcept { return false; }
+                constexpr bool operator()(...) const noexcept { return false; }
                 template <class Policy, class = typename Policy::cache_policy>
-                constexpr bool operator()(dummy<Policy>) noexcept {
+                constexpr bool operator()(dummy<Policy>) const noexcept {
                     return true;
                 }
             };
             struct is_preferred_integer_types_policy {
-                constexpr bool operator()(...) noexcept { return false; }
+                constexpr bool operator()(...) const noexcept { return false; }
                 template <class Policy, class = typename Policy::preferred_integer_types_policy>
-                constexpr bool operator()(dummy<Policy>) noexcept {
+                constexpr bool operator()(dummy<Policy>) const noexcept {
                     return true;
                 }
             };