From 6923b3b1e526b3305de81f784fdca26736caf5ba Mon Sep 17 00:00:00 2001
From: Michael Schellenberger Costa <miscco@nvidia.com>
Date: Fri, 3 May 2024 11:57:58 -0700
Subject: [PATCH] Ensure that `tuple_size` is defined (#473)

Some compilers have issues trying to instantiate it too early. We can
work around this by adding another SFINAE condition.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
---
 include/cuco/detail/pair/traits.hpp | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/cuco/detail/pair/traits.hpp b/include/cuco/detail/pair/traits.hpp
index be23678bd..af3b0ffb2 100644
--- a/include/cuco/detail/pair/traits.hpp
+++ b/include/cuco/detail/pair/traits.hpp
@@ -38,10 +38,10 @@ template <typename T, typename = void>
 struct is_cuda_std_pair_like : cuda::std::false_type {};
 
 template <typename T>
-struct is_cuda_std_pair_like<
-  T,
-  cuda::std::void_t<decltype(cuda::std::get<0>(cuda::std::declval<T>())),
-                    decltype(cuda::std::get<1>(cuda::std::declval<T>()))>>
+struct is_cuda_std_pair_like<T,
+                             cuda::std::void_t<decltype(cuda::std::get<0>(cuda::std::declval<T>())),
+                                               decltype(cuda::std::get<1>(cuda::std::declval<T>())),
+                                               decltype(cuda::std::tuple_size<T>::value)>>
   : cuda::std::conditional_t<cuda::std::tuple_size<T>::value == 2,
                              cuda::std::true_type,
                              cuda::std::false_type> {};
@@ -50,10 +50,10 @@ template <typename T, typename = void>
 struct is_thrust_pair_like_impl : cuda::std::false_type {};
 
 template <typename T>
-struct is_thrust_pair_like_impl<
-  T,
-  cuda::std::void_t<decltype(thrust::get<0>(cuda::std::declval<T>())),
-                    decltype(thrust::get<1>(cuda::std::declval<T>()))>>
+struct is_thrust_pair_like_impl<T,
+                                cuda::std::void_t<decltype(thrust::get<0>(cuda::std::declval<T>())),
+                                                  decltype(thrust::get<1>(cuda::std::declval<T>())),
+                                                  decltype(thrust::tuple_size<T>::value)>>
   : cuda::std::conditional_t<thrust::tuple_size<T>::value == 2,
                              cuda::std::true_type,
                              cuda::std::false_type> {};