From 22d630fec125c44a60878dcd664b32b65403efae Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Mon, 20 Jan 2020 12:18:05 +0900
Subject: [PATCH] feat: replace detail::stuff by std if possible

---
 toml/traits.hpp  | 28 ++++++++++++++++++++++++++++
 toml/utility.hpp |  8 ++++++++
 2 files changed, 36 insertions(+)

diff --git a/toml/traits.hpp b/toml/traits.hpp
index ec05f08..4fc1bda 100644
--- a/toml/traits.hpp
+++ b/toml/traits.hpp
@@ -111,6 +111,14 @@ struct has_into_toml_method
 // ---------------------------------------------------------------------------
 // C++17 and/or/not
 
+#if __cplusplus >= 201703L
+
+using std::conjunction;
+using std::disjunction;
+using std::negation;
+
+#else
+
 template<typename ...> struct conjunction : std::true_type{};
 template<typename T>   struct conjunction<T> : T{};
 template<typename T, typename ... Ts>
@@ -128,6 +136,8 @@ struct disjunction<T, Ts...> :
 template<typename T>
 struct negation : std::integral_constant<bool, !static_cast<bool>(T::value)>{};
 
+#endif
+
 // ---------------------------------------------------------------------------
 // type checkers
 
@@ -182,6 +192,13 @@ struct is_basic_value<::toml::basic_value<C, M, V>>: std::true_type{};
 // ---------------------------------------------------------------------------
 // C++14 index_sequence
 
+#if __cplusplus >= 201402L
+
+using std::index_sequence;
+using std::make_index_sequence;
+
+#else
+
 template<std::size_t ... Ns> struct index_sequence{};
 
 template<typename IS, std::size_t N> struct push_back_index_sequence{};
@@ -205,11 +222,22 @@ struct index_sequence_maker<0>
 template<std::size_t N>
 using make_index_sequence = typename index_sequence_maker<N-1>::type;
 
+#endif // __cplusplus >= 2014
+
 // ---------------------------------------------------------------------------
 // C++14 enable_if_t
+
+#if __cplusplus >= 201402L
+
+using std::enable_if_t;
+
+#else
+
 template<bool B, typename T>
 using enable_if_t = typename std::enable_if<B, T>::type;
 
+#endif // __cplusplus >= 2014
+
 // ---------------------------------------------------------------------------
 // return_type_of_t
 
diff --git a/toml/utility.hpp b/toml/utility.hpp
index 73ae26e..bac1249 100644
--- a/toml/utility.hpp
+++ b/toml/utility.hpp
@@ -20,12 +20,20 @@
 namespace toml
 {
 
+#if __cplusplus >= 201402L
+
+using std::make_unique;
+
+#else
+
 template<typename T, typename ... Ts>
 inline std::unique_ptr<T> make_unique(Ts&& ... args)
 {
     return std::unique_ptr<T>(new T(std::forward<Ts>(args)...));
 }
 
+#endif // __cplusplus >= 2014
+
 namespace detail
 {