From 355090f02e9bc715b30c7142458daeb9ad7cc4ac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Tue, 21 Nov 2023 15:18:16 +0300
Subject: [PATCH] =?UTF-8?q?mdbx++:=20=D0=B4=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB?=
 =?UTF-8?q?=D0=B5=D0=BD=D0=B8=D0=B5=20`is=5Fxyz()`=20=D0=B4=D0=BB=D1=8F=20?=
 =?UTF-8?q?`key=5Fmode`=20=D0=B8=20`value=5Fmode`.?=
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---
 mdbx.h++ | 62 ++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 54 insertions(+), 8 deletions(-)

diff --git a/mdbx.h++ b/mdbx.h++
index 27df86de..6da418e3 100644
--- a/mdbx.h++
+++ b/mdbx.h++
@@ -3119,6 +3119,26 @@ enum class key_mode {
                ///< \note Not yet implemented and PRs are welcome.
 };
 
+MDBX_CXX01_CONSTEXPR_ENUM bool is_usual(key_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & (MDBX_REVERSEKEY | MDBX_INTEGERKEY)) == 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_ordinal(key_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & MDBX_INTEGERKEY) != 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_samelength(key_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & MDBX_INTEGERKEY) != 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_reverse(key_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & MDBX_REVERSEKEY) != 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_msgpack(key_mode mode) noexcept {
+  return mode == key_mode::msgpack;
+}
+
 /// \brief Kind of the values and sorted multi-values with corresponding
 /// comparison.
 enum class value_mode {
@@ -3171,6 +3191,15 @@ enum class value_mode {
                      ///< end of the keys to the beginning. In terms of keys,
                      ///< they are not unique, i.e. has duplicates which are
                      ///< sorted by associated data values.
+#else
+  multi_reverse = uint32_t(MDBX_DUPSORT) | uint32_t(MDBX_REVERSEDUP),
+  multi_samelength = uint32_t(MDBX_DUPSORT) | uint32_t(MDBX_DUPFIXED),
+  multi_ordinal = uint32_t(MDBX_DUPSORT) | uint32_t(MDBX_DUPFIXED) |
+                  uint32_t(MDBX_INTEGERDUP),
+  multi_reverse_samelength = uint32_t(MDBX_DUPSORT) |
+                             uint32_t(MDBX_REVERSEDUP) |
+                             uint32_t(MDBX_DUPFIXED),
+#endif
   msgpack = -1 ///< A more than one data value could be associated with each
                ///< key. Values are in [MessagePack](https://msgpack.org/)
                ///< format with appropriate comparison. Internally each key is
@@ -3178,16 +3207,33 @@ enum class value_mode {
                ///< In terms of keys, they are not unique, i.e. has duplicates
                ///< which are sorted by associated data values.
                ///< \note Not yet implemented and PRs are welcome.
-#else
-  multi_reverse = uint32_t(MDBX_DUPSORT) | uint32_t(MDBX_REVERSEDUP),
-  multi_samelength = uint32_t(MDBX_DUPSORT) | uint32_t(MDBX_DUPFIXED),
-  multi_ordinal = uint32_t(MDBX_DUPSORT) | uint32_t(MDBX_DUPFIXED) |
-                  uint32_t(MDBX_INTEGERDUP),
-  multi_reverse_samelength = uint32_t(MDBX_DUPSORT) |
-                             uint32_t(MDBX_REVERSEDUP) | uint32_t(MDBX_DUPFIXED)
-#endif
 };
 
+MDBX_CXX01_CONSTEXPR_ENUM bool is_usual(value_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & (MDBX_DUPSORT | MDBX_INTEGERDUP |
+                                   MDBX_DUPFIXED | MDBX_REVERSEDUP)) == 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_multi(value_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & MDBX_DUPSORT) != 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_ordinal(value_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & MDBX_INTEGERDUP) != 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_samelength(value_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & MDBX_DUPFIXED) != 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_reverse(value_mode mode) noexcept {
+  return (MDBX_db_flags_t(mode) & MDBX_REVERSEDUP) != 0;
+}
+
+MDBX_CXX01_CONSTEXPR_ENUM bool is_msgpack(value_mode mode) noexcept {
+  return mode == value_mode::msgpack;
+}
+
 /// \brief A handle for an individual database (key-value spaces) in the
 /// environment.
 /// \see txn::open_map() \see txn::create_map()