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worked around VS2015 issue

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This commit is contained in:
joaquintides
2023-07-10 19:54:45 +02:00
parent 8b024986da
commit 33f4b04f69
1 changed files with 16 additions and 11 deletions
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27
include/boost/unordered/detail/foa/takes_arg_as_const_reference.hpp
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@ -138,12 +138,27 @@ BOOST_UNORDERED_HAS_CONST_REFERENCE_ARG_MEMFUN(const volatile&&)
/* Detects if f(x) takes x as a const reference. From an implementation
* technique by Kenneth Gorking.
* Requires: F is invocable with an Arg&.
* takes_arg_as_const_reference implemented with an auxiliary
* takes_arg_as_const_reference0 base because VS2015 erroneously matches
* &F::operator() for templated call operators.
*/
template<typename F,typename /*Arg*/,typename=void>
struct takes_arg_as_const_reference:
struct takes_arg_as_const_reference0:
has_const_reference_arg<remove_noexcept_t<F>>{};
template<typename F,typename Arg>
struct takes_arg_as_const_reference0<
F,Arg,
boost::void_t<decltype(&F::operator())>
>:
takes_arg_as_const_reference0<
decltype(&F::operator()),Arg
>{};
template<typename F,typename Arg,typename=void>
struct takes_arg_as_const_reference:takes_arg_as_const_reference0<F,Arg>{};
#if BOOST_WORKAROUND(BOOST_MSVC,<1920)
/* VS2017 and older issue a C3517 error when trying to obtain the type of
* an instantiation of a function template with deduced return type if
@ -173,16 +188,6 @@ takes_arg_as_const_reference<
>{};
#endif
template<typename F,typename Arg>
struct takes_arg_as_const_reference<
F,Arg,
boost::void_t<decltype(&F::operator())>
>:
takes_arg_as_const_reference<
decltype(&F::operator()),Arg
>{};
} /* namespace foa */
} /* namespace detail */
} /* namespace unordered */