Add 'is_callable' and 'is_nothrow_callable' traits and cleanup INVOKE.

The primary purpose of this patch is to add the 'is_callable' traits.
Since 'is_nothrow_callable' required making 'INVOKE' conditionally noexcept
I also took this oppertunity to implement a constexpr version of INVOKE.
This fixes 'std::experimental::apply' which required constexpr 'INVOKE support'.

This patch will be followed up with some cleanup. Primarly removing most
of "__member_function_traits" since it's no longer used by INVOKE (in C++11 at least).

llvm-svn: 266836

2 files changed, 3 insertions, 3 deletions

diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp
index aa77dab5151..3e4a99e981d 100644
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03
+
 // <memory>
 
 // shared_ptr
@@ -55,7 +57,6 @@ int main()
     }
     assert(A::count == 0);
     assert(test_allocator<A>::alloc_count == 0);
-#if __cplusplus >= 201103L
     {
     int i = 67;
     char c = 'e';
@@ -74,5 +75,4 @@ int main()
     assert(p->get_char() == 'f');
     }
     assert(A::count == 0);
-#endif
 }
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_no_variadics.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_cxx03.pass.cpp
index 8dcd50e4941..f6350c72bcc 100644
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_no_variadics.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_cxx03.pass.cpp
@@ -14,7 +14,7 @@
 // template<class T, class A, class... Args>
 //    shared_ptr<T> allocate_shared(const A& a, Args&&... args);
 
-#define _LIBCPP_HAS_NO_VARIADICS
+
 #include <memory>
 #include <new>
 #include <cstdlib>