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Update extract() SFINAE to be friendly to msvc-14.0

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msvc-14.0 seems to require the parameter pack be explicitly mentioned though no other compilers seem to have this issue
This commit is contained in:
Christian Mazakas
2023-09-21 11:07:14 -07:00
parent d3e6be7356
commit 3f3b2128ec
1 changed files with 6 additions and 4 deletions
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10
include/boost/unordered/detail/implementation.hpp
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@ -2878,11 +2878,13 @@ namespace boost {
return no_key(); return no_key();
} }
template <template <class...> class Tuple, typename T, typename T2, template <template <typename...> class Tuple, typename T, typename T2,
typename... Args>
static auto extract(
std::piecewise_construct_t, Tuple<T, Args...> const& k, T2 const&) ->
typename std::enable_if< typename std::enable_if<
!std::is_same<T, boost::tuples::null_type>::value, int>::type = 0> !std::is_same<T, boost::tuples::null_type>::value,
static typename is_key<key_type, T>::type extract( typename is_key<key_type, T>::type>::type
std::piecewise_construct_t, Tuple<T> const& k, T2 const&)
{ {
using std::get; using std::get;
return typename is_key<key_type, T>::type(get<0>(k)); return typename is_key<key_type, T>::type(get<0>(k));