From 55260654bff8a42fe48b78258bbba4fd3d4aae5e Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Fri, 10 Jan 2020 20:38:52 +0900
Subject: [PATCH] feat: get user-defined value by constructor

If a user-defined constructor has constructor(const toml::value&),
then it should be convertible in `toml::get` and `toml::find`.
---
 toml/get.hpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/toml/get.hpp b/toml/get.hpp
index ce2ea54..6418efe 100644
--- a/toml/get.hpp
+++ b/toml/get.hpp
@@ -259,6 +259,15 @@ template<typename T, typename C,
          std::size_t S = sizeof(::toml::from<T>)>
 T get(const basic_value<C, M, V>&);
 
+// T(const toml::value&) and T is not toml::basic_value
+template<typename T, typename C,
+         template<typename ...> class M, template<typename ...> class V>
+detail::enable_if_t<detail::conjunction<
+    detail::negation<detail::is_basic_value<T>>,
+    std::is_constructible<T, const basic_value<C, M, V>&>
+    >::value, T>
+get(const basic_value<C, M, V>&);
+
 // ============================================================================
 // array-like types; most likely STL container, like std::vector, etc.
 
@@ -417,6 +426,17 @@ T get(const basic_value<C, M, V>& v)
     return ::toml::from<T>::from_toml(v);
 }
 
+template<typename T, typename C,
+         template<typename ...> class M, template<typename ...> class V>
+detail::enable_if_t<detail::conjunction<
+    detail::negation<detail::is_basic_value<T>>,
+    std::is_constructible<T, const basic_value<C, M, V>&>
+    >::value, T>
+get(const basic_value<C, M, V>& v)
+{
+    return T(v);
+}
+
 // ============================================================================
 // find