summaryrefslogtreecommitdiff
path: root/boost/type_traits/is_detected.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'boost/type_traits/is_detected.hpp')
-rw-r--r--boost/type_traits/is_detected.hpp29
1 files changed, 29 insertions, 0 deletions
diff --git a/boost/type_traits/is_detected.hpp b/boost/type_traits/is_detected.hpp
new file mode 100644
index 0000000000..8bff9d938e
--- /dev/null
+++ b/boost/type_traits/is_detected.hpp
@@ -0,0 +1,29 @@
+/*
+Copyright 2017-2018 Glen Joseph Fernandes
+<glenjofe -at- gmail.com>
+
+Distributed under the Boost Software License,
+Version 1.0. (See accompanying file LICENSE_1_0.txt
+or copy at http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#ifndef BOOST_TT_IS_DETECTED_HPP_INCLUDED
+#define BOOST_TT_IS_DETECTED_HPP_INCLUDED
+
+#include <boost/type_traits/detail/detector.hpp>
+#include <boost/type_traits/nonesuch.hpp>
+
+namespace boost {
+
+template<template<class...> class Op, class... Args>
+using is_detected = typename
+ detail::detector<nonesuch, void, Op, Args...>::value_t;
+
+#if !defined(BOOST_NO_CXX14_VARIABLE_TEMPLATES)
+template<template<class...> class Op, class... Args>
+constexpr bool is_detected_v = is_detected<Op, Args...>::value;
+#endif
+
+} /* boost */
+
+#endif