merge(3p/absl): subtree merge of Abseil up to e19260f
... notably, this includes Abseil's own StatusOr type, which conflicted with our implementation (that was taken from TensorFlow). Change-Id: Ie7d6764b64055caaeb8dc7b6b9d066291e6b538f
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854 changed files with 11260 additions and 5296 deletions
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@ -146,8 +146,11 @@ class node_handle<Policy, PolicyTraits, Alloc,
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constexpr node_handle() {}
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auto key() const -> decltype(PolicyTraits::key(std::declval<slot_type*>())) {
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return PolicyTraits::key(this->slot());
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// When C++17 is available, we can use std::launder to provide mutable
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// access to the key. Otherwise, we provide const access.
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auto key() const
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-> decltype(PolicyTraits::mutable_key(std::declval<slot_type*>())) {
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return PolicyTraits::mutable_key(this->slot());
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}
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mapped_type& mapped() const {
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