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+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_FUNCTIONAL_BASE_03
+#define _LIBCPP_FUNCTIONAL_BASE_03
+
+// manual variadic expansion for <functional>
+
+// __invoke
+
+template <class _Ret, class _T1, bool _IsFunc, bool _IsBase>
+struct __enable_invoke_imp;
+
+template <class _Ret, class _T1>
+struct __enable_invoke_imp<_Ret, _T1, true, true> {
+    typedef _Ret _Bullet1;
+    typedef _Bullet1 type;
+};
+
+template <class _Ret, class _T1>
+struct __enable_invoke_imp<_Ret, _T1, true, false>  {
+    typedef _Ret _Bullet2;
+    typedef _Bullet2 type;
+};
+
+template <class _Ret, class _T1>
+struct __enable_invoke_imp<_Ret, _T1, false, true>  {
+    typedef typename add_lvalue_reference<
+                typename __apply_cv<_T1, _Ret>::type
+            >::type _Bullet3;
+    typedef _Bullet3 type;
+};
+
+template <class _Ret, class _T1>
+struct __enable_invoke_imp<_Ret, _T1, false, false>  {
+    typedef typename add_lvalue_reference<
+                typename __apply_cv<decltype(*_VSTD::declval<_T1>()), _Ret>::type
+            >::type _Bullet4;
+    typedef _Bullet4 type;
+};
+
+template <class _Ret, class _T1>
+struct __enable_invoke_imp<_Ret, _T1*, false, false>  {
+    typedef typename add_lvalue_reference<
+                typename __apply_cv<_T1, _Ret>::type
+            >::type _Bullet4;
+    typedef _Bullet4  type;
+};
+
+template <class _Fn, class _T1,
+          class _Traits = __member_pointer_traits<_Fn>,
+          class _Ret = typename _Traits::_ReturnType,
+          class _Class = typename _Traits::_ClassType>
+struct __enable_invoke : __enable_invoke_imp<
+    _Ret, _T1,
+    is_member_function_pointer<_Fn>::value,
+    is_base_of<_Class, typename remove_reference<_T1>::type>::value>
+{
+};
+
+__nat __invoke(__any, ...);
+
+// first bullet
+
+template <class _Fn, class _T1>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet1
+__invoke(_Fn __f, _T1& __t1) {
+    return (__t1.*__f)();
+}
+
+template <class _Fn, class _T1, class _A0>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet1
+__invoke(_Fn __f, _T1& __t1, _A0& __a0) {
+    return (__t1.*__f)(__a0);
+}
+
+template <class _Fn, class _T1, class _A0, class _A1>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet1
+__invoke(_Fn __f, _T1& __t1, _A0& __a0, _A1& __a1) {
+    return (__t1.*__f)(__a0, __a1);
+}
+
+template <class _Fn, class _T1, class _A0, class _A1, class _A2>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet1
+__invoke(_Fn __f, _T1& __t1, _A0& __a0, _A1& __a1, _A2& __a2) {
+    return (__t1.*__f)(__a0, __a1, __a2);
+}
+
+template <class _Fn, class _T1>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet2
+__invoke(_Fn __f, _T1& __t1) {
+    return ((*__t1).*__f)();
+}
+
+template <class _Fn, class _T1, class _A0>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet2
+__invoke(_Fn __f, _T1& __t1, _A0& __a0) {
+    return ((*__t1).*__f)(__a0);
+}
+
+template <class _Fn, class _T1, class _A0, class _A1>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet2
+__invoke(_Fn __f, _T1& __t1, _A0& __a0, _A1& __a1) {
+    return ((*__t1).*__f)(__a0, __a1);
+}
+
+template <class _Fn, class _T1, class _A0, class _A1, class _A2>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet2
+__invoke(_Fn __f, _T1& __t1, _A0& __a0, _A1& __a1, _A2& __a2) {
+    return ((*__t1).*__f)(__a0, __a1, __a2);
+}
+
+template <class _Fn, class _T1>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet3
+__invoke(_Fn __f, _T1& __t1) {
+    return __t1.*__f;
+}
+
+template <class _Fn, class _T1>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __enable_invoke<_Fn, _T1>::_Bullet4
+__invoke(_Fn __f, _T1& __t1) {
+    return (*__t1).*__f;
+}
+
+// fifth bullet
+
+template <class _Fp>
+inline _LIBCPP_INLINE_VISIBILITY
+decltype(_VSTD::declval<_Fp&>()())
+__invoke(_Fp& __f)
+{
+    return __f();
+}
+
+template <class _Fp, class _A0>
+inline _LIBCPP_INLINE_VISIBILITY
+decltype(_VSTD::declval<_Fp&>()(_VSTD::declval<_A0&>()))
+__invoke(_Fp& __f, _A0& __a0)
+{
+    return __f(__a0);
+}
+
+template <class _Fp, class _A0, class _A1>
+inline _LIBCPP_INLINE_VISIBILITY
+decltype(_VSTD::declval<_Fp&>()(_VSTD::declval<_A0&>(), _VSTD::declval<_A1&>()))
+__invoke(_Fp& __f, _A0& __a0, _A1& __a1)
+{
+    return __f(__a0, __a1);
+}
+
+template <class _Fp, class _A0, class _A1, class _A2>
+inline _LIBCPP_INLINE_VISIBILITY
+decltype(_VSTD::declval<_Fp&>()(_VSTD::declval<_A0&>(), _VSTD::declval<_A1&>(), _VSTD::declval<_A2&>()))
+__invoke(_Fp& __f, _A0& __a0, _A1& __a1, _A2& __a2)
+{
+    return __f(__a0, __a1, __a2);
+}
+
+template <class _Fp, bool = __has_result_type<__weak_result_type<_Fp> >::value>
+struct __invoke_return
+{
+    typedef typename __weak_result_type<_Fp>::result_type type;
+};
+
+template <class _Fp>
+struct __invoke_return<_Fp, false>
+{
+    typedef decltype(__invoke(_VSTD::declval<_Fp&>())) type;
+};
+
+template <class _Tp, class _A0>
+struct __invoke_return0
+{
+    typedef decltype(__invoke(_VSTD::declval<_Tp&>(), _VSTD::declval<_A0&>())) type;
+};
+
+template <class _Rp, class _Tp, class _A0>
+struct __invoke_return0<_Rp _Tp::*, _A0>
+{
+    typedef typename __enable_invoke<_Rp _Tp::*, _A0>::type type;
+};
+
+template <class _Tp, class _A0, class _A1>
+struct __invoke_return1
+{
+    typedef decltype(__invoke(_VSTD::declval<_Tp&>(), _VSTD::declval<_A0&>(),
+                                                      _VSTD::declval<_A1&>())) type;
+};
+
+template <class _Rp, class _Class, class _A0, class _A1>
+struct __invoke_return1<_Rp _Class::*, _A0, _A1> {
+    typedef typename __enable_invoke<_Rp _Class::*, _A0>::type type;
+};
+
+template <class _Tp, class _A0, class _A1, class _A2>
+struct __invoke_return2
+{
+    typedef decltype(__invoke(_VSTD::declval<_Tp&>(), _VSTD::declval<_A0&>(),
+                                                      _VSTD::declval<_A1&>(),
+                                                      _VSTD::declval<_A2&>())) type;
+};
+
+template <class _Ret, class _Class, class _A0, class _A1, class _A2>
+struct __invoke_return2<_Ret _Class::*, _A0, _A1, _A2> {
+    typedef typename __enable_invoke<_Ret _Class::*, _A0>::type type;
+};
+#endif  // _LIBCPP_FUNCTIONAL_BASE_03