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// Copyright 2012-2022 The ANTLR Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted
// provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions
// and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of
// conditions and the following disclaimer in the documentation and/or other materials provided
// with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to
// endorse or promote products derived from this software without specific prior written
// permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
// WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include "antlr4-common.h"
#if ANTLR4CPP_USING_ABSEIL
#error #include "absl/container/flat_hash_set.h"
#else
#include <unordered_set>
#endif
// By default ANTLRv4 uses containers provided by the C++ standard library. In most deployments this
// is fine, however in some using custom containers may be preferred. This header allows that by
// optionally supporting some alternative implementations and allowing for more easier patching of
// other alternatives.
namespace antlr4 {
#if ANTLR4CPP_USING_ABSEIL
template <typename Key,
typename Hash = typename absl::flat_hash_set<Key>::hasher,
typename Equal = typename absl::flat_hash_set<Key>::key_equal,
typename Allocator = typename absl::flat_hash_set<Key>::allocator_type>
using FlatHashSet = absl::flat_hash_set<Key, Hash, Equal, Allocator>;
#else
template <typename Key,
typename Hash = typename std::unordered_set<Key>::hasher,
typename Equal = typename std::unordered_set<Key>::key_equal,
typename Allocator = typename std::unordered_set<Key>::allocator_type>
using FlatHashSet = std::unordered_set<Key, Hash, Equal, Allocator>;
#endif
} // namespace antlr4
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