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authorDongHun Kwak <dh0128.kwak@samsung.com>2019-12-05 15:12:59 +0900
committerDongHun Kwak <dh0128.kwak@samsung.com>2019-12-05 15:12:59 +0900
commitb8cf34c691623e4ec329053cbbf68522a855882d (patch)
tree34da08632a99677f6b79ecb65e5b655a5b69a67f /boost/poly_collection/detail/is_likely_stateless_lambda.hpp
parent3fdc3e5ee96dca5b11d1694975a65200787eab86 (diff)
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Imported Upstream version 1.67.0upstream/1.67.0
Diffstat (limited to 'boost/poly_collection/detail/is_likely_stateless_lambda.hpp')
-rw-r--r--boost/poly_collection/detail/is_likely_stateless_lambda.hpp70
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diff --git a/boost/poly_collection/detail/is_likely_stateless_lambda.hpp b/boost/poly_collection/detail/is_likely_stateless_lambda.hpp
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--- a/boost/poly_collection/detail/is_likely_stateless_lambda.hpp
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@@ -1,70 +0,0 @@
-/* Copyright 2017 Joaquin M Lopez Munoz.
- * 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)
- *
- * See http://www.boost.org/libs/poly_collection for library home page.
- */
-
-#ifndef BOOST_POLY_COLLECTION_DETAIL_IS_LIKELY_STATELESS_LAMBDA_HPP
-#define BOOST_POLY_COLLECTION_DETAIL_IS_LIKELY_STATELESS_LAMBDA_HPP
-
-#if defined(_MSC_VER)
-#pragma once
-#endif
-
-#include <type_traits>
-
-namespace boost{
-
-namespace poly_collection{
-
-namespace detail{
-
-/* Stateless lambda expressions have one (and only one) call operator and are
- * convertible to a function pointer with the same signature. Non-lambda types
- * could satisfy this too, hence the "likely" qualifier.
- */
-
-template<typename T>
-struct has_one_operator_call_helper
-{
- template<typename Q> static std::true_type test(decltype(&Q::operator())*);
- template<typename> static std::false_type test(...);
-
- using type=decltype(test<T>(nullptr));
-};
-
-template<typename T>
-using has_one_operator_call=typename has_one_operator_call_helper<T>::type;
-
-template<typename T>
-struct equivalent_function_pointer
-{
- template<typename Q,typename R,typename... Args>
- static auto helper(R (Q::*)(Args...)const)->R(*)(Args...);
- template<typename Q,typename R,typename... Args>
- static auto helper(R (Q::*)(Args...))->R(*)(Args...);
-
- using type=decltype(helper(&T::operator()));
-};
-
-template<typename T,typename=void>
-struct is_likely_stateless_lambda:std::false_type{};
-
-template<typename T>
-struct is_likely_stateless_lambda<
- T,
- typename std::enable_if<has_one_operator_call<T>::value>::type
->:std::is_convertible<
- T,
- typename equivalent_function_pointer<T>::type
->{};
-
-} /* namespace poly_collection::detail */
-
-} /* namespace poly_collection */
-
-} /* namespace boost */
-
-#endif