add boost on mac

macx64/include/boost/callable_traits/detail/is_invocable_impl.hpp

@@ -0,0 +1,150 @@
+ /*!
+@file
+
+@Copyright Barrett Adair 2015-2017
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+*/
+
+#ifndef BOOST_CLBL_TRTS_IS_INVOCABLE_IMPL_HPP
+#define BOOST_CLBL_TRTS_IS_INVOCABLE_IMPL_HPP
+
+#include <boost/callable_traits/detail/config.hpp>
+#include <boost/callable_traits/detail/forward_declarations.hpp>
+#include <boost/callable_traits/detail/utility.hpp>
+#include <type_traits>
+#include <utility>
+
+namespace boost { namespace callable_traits { namespace detail {
+
+    template<typename T>
+    struct can_dereference_t
+    {
+        template<typename>
+        struct check {};
+
+        template<typename U>
+        static std::int8_t test(
+            check<typename std::remove_reference<decltype(*std::declval<U>())>::type>*
+        );
+
+        template<typename>
+        static std::int16_t test(...);
+
+        static constexpr const bool value =
+            sizeof(test<T>(nullptr)) == sizeof(std::int8_t);
+    };
+
+    //returns std::true_type for pointers and smart pointers
+    template<typename T>
+    using can_dereference = std::integral_constant<bool,
+        can_dereference_t<T>::value>;
+
+
+    template<typename T, typename = std::true_type>
+    struct generalize_t {
+        using type = T;
+    };
+
+    template<typename T>
+    struct generalize_t<T, std::integral_constant<bool,
+            can_dereference<T>::value && !is_reference_wrapper<T>::value
+    >>{
+        using type = decltype(*std::declval<T>());
+    };
+
+    template<typename T>
+    struct generalize_t<T, is_reference_wrapper<T>> {
+        using type = decltype(std::declval<T>().get());
+    };
+
+    // When T is a pointer, generalize<T> is the resulting type of the
+    // pointer dereferenced. When T is an std::reference_wrapper, generalize<T>
+    // is the underlying reference type. Otherwise, generalize<T> is T.
+    template<typename T>
+    using generalize = typename generalize_t<T>::type;
+
+    // handles the member pointer rules of INVOKE
+    template<typename Base, typename T,
+             typename IsBaseOf = std::is_base_of<Base, shallow_decay<T>>,
+             typename IsSame = std::is_same<Base, shallow_decay<T>>>
+    using generalize_if_dissimilar = typename std::conditional<
+        IsBaseOf::value || IsSame::value, T, generalize<T>>::type;
+
+    template<typename Traits, bool = Traits::is_const_member::value
+        || Traits::is_volatile_member::value
+        || Traits::is_lvalue_reference_member::value
+        || Traits::is_rvalue_reference_member::value>
+    struct test_invoke {
+
+        template<typename... Rgs,
+            typename U = typename Traits::type>
+        auto operator()(int, Rgs&&... rgs) const ->
+            success<decltype(std::declval<U>()(static_cast<Rgs&&>(rgs)...))>;
+
+        auto operator()(long, ...) const -> substitution_failure;
+    };
+
+    template<typename F>
+    struct test_invoke<function<F>, true /*abominable*/> {
+        auto operator()(...) const -> substitution_failure;
+    };
+
+    template<typename Pmf, bool Ignored>
+    struct test_invoke<pmf<Pmf>, Ignored> {
+
+        using class_t = typename pmf<Pmf>::class_type;
+
+       template<typename U, typename... Rgs,
+            typename Obj = generalize_if_dissimilar<class_t, U&&>>
+        auto operator()(int, U&& u, Rgs&&... rgs) const ->
+            success<decltype((std::declval<Obj>().*std::declval<Pmf>())(static_cast<Rgs&&>(rgs)...))>;
+
+        auto operator()(long, ...) const -> substitution_failure;
+    };
+
+    template<typename Pmd, bool Ignored>
+    struct test_invoke<pmd<Pmd>, Ignored> {
+
+        using class_t = typename pmd<Pmd>::class_type;
+
+        template<typename U,
+            typename Obj = generalize_if_dissimilar<class_t, U&&>>
+        auto operator()(int, U&& u) const ->
+            success<decltype(std::declval<Obj>().*std::declval<Pmd>())>;
+
+        auto operator()(long, ...) const -> substitution_failure;
+    };
+
+    template<typename T, typename... Args>
+    struct is_invocable_impl {
+        using traits = detail::traits<T>;
+        using test = detail::test_invoke<traits>;
+        using result = decltype(test{}(0, ::std::declval<Args>()...));
+        using type = std::integral_constant<bool, result::value>;
+    };
+
+    template<typename... Args>
+    struct is_invocable_impl<void, Args...> {
+        using type = std::false_type;
+    };
+
+    template<typename IsInvocable, typename Ret, typename T, typename... Args>
+    struct is_invocable_r_impl {
+        using traits = detail::traits<T>;
+        using test = detail::test_invoke<traits>;
+        using result = decltype(test{}(0, ::std::declval<Args>()...));
+        using type = std::integral_constant<bool,
+            std::is_convertible<typename result::_::type, Ret>::value
+                || std::is_same<Ret, void>::value>;
+    };
+
+    template<typename Ret, typename T, typename... Args>
+    struct is_invocable_r_impl<std::false_type, Ret, T, Args...> {
+        using type = std::false_type;
+    };
+
+}}} // namespace boost::callable_traits::detail
+
+#endif // #ifndef BOOST_CLBL_TRTS_IS_INVOCABLE_IMPL_HPP