From cb4e2934297a5139b783a3eb9641e0ceec34d738 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=B1=85=E6=88=8E=E6=B0=8F?= <chen.sst@gmail.com>
Date: Mon, 8 Apr 2024 00:32:01 +0800
Subject: [PATCH] constexpr doesn't work here

---
 include/WeaselUtility.h | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/WeaselUtility.h b/include/WeaselUtility.h
index c45d62d97..00db2481e 100644
--- a/include/WeaselUtility.h
+++ b/include/WeaselUtility.h
@@ -86,34 +86,34 @@ inline std::string wstring_to_string(const std::wstring& wstr,
 
 template <typename CharT>
 struct EscapeChar {
-  static constexpr CharT escape;
-  static constexpr CharT linefeed;
-  static constexpr CharT tab;
-  static constexpr CharT linefeed_escape;
-  static constexpr CharT tab_escape;
+  static const CharT escape;
+  static const CharT linefeed;
+  static const CharT tab;
+  static const CharT linefeed_escape;
+  static const CharT tab_escape;
 };
 
 template <>
-constexpr char EscapeChar<char>::escape = '\\';
+const char EscapeChar<char>::escape = '\\';
 template <>
-constexpr char EscapeChar<char>::linefeed = '\n';
+const char EscapeChar<char>::linefeed = '\n';
 template <>
-constexpr char EscapeChar<char>::tab = '\t';
+const char EscapeChar<char>::tab = '\t';
 template <>
-constexpr char EscapeChar<char>::linefeed_escape = 'n';
+const char EscapeChar<char>::linefeed_escape = 'n';
 template <>
-constexpr char EscapeChar<char>::tab_escape = 't';
+const char EscapeChar<char>::tab_escape = 't';
 
 template <>
-constexpr char EscapeChar<wchar_t>::escape = L'\\';
+const char EscapeChar<wchar_t>::escape = L'\\';
 template <>
-constexpr char EscapeChar<wchar_t>::linefeed = L'\n';
+const char EscapeChar<wchar_t>::linefeed = L'\n';
 template <>
-constexpr char EscapeChar<wchar_t>::tab = L'\t';
+const char EscapeChar<wchar_t>::tab = L'\t';
 template <>
-constexpr char EscapeChar<wchar_t>::linefeed_escape = L'n';
+const char EscapeChar<wchar_t>::linefeed_escape = L'n';
 template <>
-constexpr char EscapeChar<wchar_t>::tab_escape = L't';
+const char EscapeChar<wchar_t>::tab_escape = L't';
 
 template <typename CharT>
 inline std::basic_string<CharT> escape_string(