From 5d5c651ea65098a323e6cb44a277136fc1492d7e Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Sun, 28 Jan 2018 10:44:12 +0000
Subject: [PATCH] Type_traits.is_default_constructible: workaround for
 std::pair is required for more compilers.  We don't need functional
 appveyor.yml any more.

---
 appveyor.yml                                           | 1 -
 include/boost/type_traits/is_default_constructible.hpp | 4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/appveyor.yml b/appveyor.yml
index ecee07e..415436c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -59,7 +59,6 @@ install:
   - git submodule update --init libs/throw_exception
   - git submodule update --init libs/type_index
   - git submodule update --init libs/utility
-  - git submodule update --init libs/functional
   - git submodule update --init libs/container_hash
   - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\type_traits
   - bootstrap
diff --git a/include/boost/type_traits/is_default_constructible.hpp b/include/boost/type_traits/is_default_constructible.hpp
index b463748..dc8ea13 100644
--- a/include/boost/type_traits/is_default_constructible.hpp
+++ b/include/boost/type_traits/is_default_constructible.hpp
@@ -16,7 +16,7 @@
 #if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
 #include <boost/type_traits/is_abstract.hpp>
 #endif
-#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ == 5))
+#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ <= 5)) || (defined(BOOST_MSVC) && (BOOST_MSVC == 1800))
 #include <utility> // std::pair
 #endif
 
@@ -58,7 +58,7 @@ namespace boost{
    template <class T, std::size_t N> struct is_default_constructible<T[N]> : public is_default_constructible<T>{};
    template <class T> struct is_default_constructible<T[]> : public is_default_constructible<T>{};
    template <class T> struct is_default_constructible<T&> : public integral_constant<bool, false>{};
-#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ == 5))
+#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ <= 5))|| (defined(BOOST_MSVC) && (BOOST_MSVC == 1800))
    template <class T, class U> struct is_default_constructible<std::pair<T,U> > : public integral_constant<bool, is_default_constructible<T>::value && is_default_constructible<U>::value>{};
 #endif
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)