From c00eeb18efca9f68e197361824650b9b4ad241c3 Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Sun, 2 Jun 2019 19:02:01 +0900
Subject: [PATCH] feat: add meta function that detects toml::basic_value

---
 toml/traits.hpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/toml/traits.hpp b/toml/traits.hpp
index a994d6d..e2036eb 100644
--- a/toml/traits.hpp
+++ b/toml/traits.hpp
@@ -166,6 +166,15 @@ template<typename T> struct is_container<T const&>          : is_container<T>{};
 template<typename T> struct is_container<T volatile&>       : is_container<T>{};
 template<typename T> struct is_container<T const volatile&> : is_container<T>{};
 
+template<typename T>
+struct is_basic_value: std::false_type{};
+template<typename T> struct is_basic_value<T&>                : is_basic_value<T>{};
+template<typename T> struct is_basic_value<T const&>          : is_basic_value<T>{};
+template<typename T> struct is_basic_value<T volatile&>       : is_basic_value<T>{};
+template<typename T> struct is_basic_value<T const volatile&> : is_basic_value<T>{};
+template<typename C, template<typename ...> class M, template<typename ...> class V>
+struct is_basic_value<::toml::basic_value<C, M, V>>: std::true_type{};
+
 // ---------------------------------------------------------------------------
 // C++14 index_sequence