diff options
Diffstat (limited to 'absl/types/internal/variant.h')
| -rw-r--r-- | absl/types/internal/variant.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/absl/types/internal/variant.h b/absl/types/internal/variant.h index f220afd..eff4fef 100644 --- a/absl/types/internal/variant.h +++ b/absl/types/internal/variant.h @@ -1,4 +1,4 @@ -// Copyright 2017 The Abseil Authors. +// Copyright 2018 The Abseil Authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. @@ -910,6 +910,11 @@ struct PerformVisitation { template <std::size_t... TupIs, std::size_t... Is> constexpr ReturnType Run(std::false_type /*has_valueless*/, index_sequence<TupIs...>, SizeT<Is>...) const { + static_assert( + std::is_same<ReturnType, + absl::result_of_t<Op(VariantAccessResult< + Is, QualifiedVariants>...)>>::value, + "All visitation overloads must have the same return type."); return absl::base_internal::Invoke( absl::forward<Op>(op), VariantCoreAccess::Access<Is>( |