From 947c061989fdc8cefce6802044e88d9d8dce05cf Mon Sep 17 00:00:00 2001
From: John Ralls <jralls@ceridwen.us>
Date: Sat, 11 Dec 2021 15:12:22 -0800
Subject: [PATCH] C++options: Create QofQueryValue trait.

---
 libgnucash/app-utils/gnc-option-impl.hpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libgnucash/app-utils/gnc-option-impl.hpp b/libgnucash/app-utils/gnc-option-impl.hpp
index fa92008a0d..702d62fbe8 100644
--- a/libgnucash/app-utils/gnc-option-impl.hpp
+++ b/libgnucash/app-utils/gnc-option-impl.hpp
@@ -230,6 +230,18 @@ struct is_QofInstanceValue
 template <typename T> inline constexpr bool
 is_QofInstanceValue_v = is_QofInstanceValue<T>::value;
 
+template <typename T>
+struct is_QofQueryValue
+{
+    static constexpr bool value =
+         (std::is_same_v<std::decay_t<T>, GncOptionValue<const QofQuery*>> ||
+          std::is_same_v<std::decay_t<T>,
+          GncOptionValidatedValue<const QofQuery*>>);
+};
+
+template <typename T> inline constexpr bool
+is_QofQueryValue_v = is_QofQueryValue<T>::value;
+
 /* These will work when m_value is a built-in class; GnuCash class and container
  * values will need specialization unless they happen to define operators << and
  * >>.