From: Adam C. Emerson <aemerson@redhat.com>
Date: Wed, 26 Jul 2017 22:08:32 +0000 (-0400)
Subject: common: Add in_place_t/in_place_type_t from C++17
X-Git-Tag: v13.0.0~153^2~3
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=49f3d58b493932e592206ab75e6db416c85dcb41;p=ceph.git

common: Add in_place_t/in_place_type_t from C++17

To better signal in-place construction among other overloads.

Signed-off-by: Adam C. Emerson <aemerson@redhat.com>
---

diff --git a/src/common/backport14.h b/src/common/backport14.h
index 3e6505d468d31..5e55d714a1aaf 100644
--- a/src/common/backport14.h
+++ b/src/common/backport14.h
@@ -118,11 +118,27 @@ not_fn_result<F> not_fn(F&& fn) {
   return not_fn_result<F>(std::forward<F>(fn));
 }
 
+struct in_place_t {};
+constexpr in_place_t in_place{};
+
+template<typename T>
+struct in_place_type_t {};
+
+#ifdef __cpp_variable_templates
+template<typename T>
+constexpr in_place_type_t<T> in_place_type{};
+#endif // __cpp_variable_templates
 } // namespace _backport17
 using _backport14::make_unique;
 using _backport17::size;
 using _backport14::max;
 using _backport17::not_fn;
+using _backport17::in_place_t;
+using _backport17::in_place;
+using _backport17::in_place_type_t;
+#ifdef __cpp_variable_templates
+using _backport17::in_place_type;
+#endif // __cpp_variable_templates
 } // namespace ceph
 
 #endif // CEPH_COMMON_BACKPORT14_H