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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@ -185,7 +185,7 @@ class btree_map
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// template <typename K> size_type erase(const K& key):
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//
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// Erases the element with the matching key, if it exists, returning the
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// number of elements erased.
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// number of elements erased (0 or 1).
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using Base::erase;
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// btree_map::insert()
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@ -325,6 +325,11 @@ class btree_map
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// does not contain an element with a matching key, this function returns an
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// empty node handle.
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//
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// NOTE: when compiled in an earlier version of C++ than C++17,
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// `node_type::key()` returns a const reference to the key instead of a
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// mutable reference. We cannot safely return a mutable reference without
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// std::launder (which is not available before C++17).
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//
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// NOTE: In this context, `node_type` refers to the C++17 concept of a
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// move-only type that owns and provides access to the elements in associative
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// containers (https://en.cppreference.com/w/cpp/container/node_handle).
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@ -652,6 +657,11 @@ class btree_multimap
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// does not contain an element with a matching key, this function returns an
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// empty node handle.
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//
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// NOTE: when compiled in an earlier version of C++ than C++17,
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// `node_type::key()` returns a const reference to the key instead of a
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// mutable reference. We cannot safely return a mutable reference without
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// std::launder (which is not available before C++17).
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//
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// NOTE: In this context, `node_type` refers to the C++17 concept of a
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// move-only type that owns and provides access to the elements in associative
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// containers (https://en.cppreference.com/w/cpp/container/node_handle).
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