Add is_list_constructible

doc/is_list_constructible.qbk

@@ -0,0 +1,23 @@
+[/ 
+  Copyright 2017 Peter Dimov
+
+  Distributed under the Boost Software License, Version 1.0.
+
+  (See accompanying file LICENSE_1_0.txt or copy at
+  http://www.boost.org/LICENSE_1_0.txt).
+]
+
+[section:is_list_constructible is_list_constructible]
+
+   template <class T, class... Args>
+   struct is_list_constructible : public __tof {};
+    
+__inherit If `T` can be constructed from `Args` using list initialization
+(`T{declval<Args>()...}`), then inherits from __true_type, otherwise inherits from
+__false_type. `T` must be a complete type.
+
+__compat This trait requires C++11.
+
+__header ` #include <boost/type_traits/is_list_constructible.hpp>` or ` #include <boost/type_traits.hpp>`
+
+[endsect]

doc/type_traits.qbk

@@ -72,6 +72,7 @@
 [def __is_copy_constructible [link boost_typetraits.reference.is_copy_constructible is_copy_constructible]]
 [def __is_copy_assignable [link boost_typetraits.reference.is_copy_assignable is_copy_assignable]]
 [def __is_constructible [link boost_typetraits.reference.is_constructible is_constructible]]
+[def __is_list_constructible [link boost_typetraits.reference.is_list_constructible is_list_constructible]]
 [def __is_default_constructible [link boost_typetraits.reference.is_default_constructible is_default_constructible]]
 [def __is_destructible [link boost_typetraits.reference.is_destructible is_destructible]]
 [def __is_volatile [link boost_typetraits.reference.is_volatile is_volatile]]
@@ -294,6 +295,7 @@ See __has_trivial_constructor.
 [include is_function.qbk]
 [include is_fundamental.qbk]
 [include is_integral.qbk]
+[include is_list_constructible.qbk]
 [include is_lvalue_reference.qbk]
 [include is_member_function_pointer.qbk]
 [include is_member_object_pointer.qbk]

doc/value_traits.qbk

@@ -168,6 +168,9 @@ The following templates describe the general properties of a type.
    template <class T>
    struct __is_default_constructible;
 
+   template <class T, class... Args>
+   struct __is_list_constructible;
+
    template <class T>
    struct __is_destructible;