folly/folly/container/Access.h

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <initializer_list>
#include <iterator>

#include <folly/Portability.h>
#include <folly/functional/Invoke.h>

namespace folly {

namespace access {

//  mimic: std::size, C++17
struct size_fn { … };
inline constexpr size_fn size{ … };

//  mimic: std::empty, C++17
struct empty_fn { … };
inline constexpr empty_fn empty{ … };

//  mimic: std::data, C++17
struct data_fn { … };
inline constexpr data_fn data{ … };

//  begin
//
//  Invokes unqualified begin with std::begin in scope.
FOLLY_CREATE_FREE_INVOKER(begin_fn, begin, std);
inline constexpr begin_fn begin{ … };

//  end
//
//  Invokes unqualified end with std::end in scope.
FOLLY_CREATE_FREE_INVOKER(end_fn, end, std);
inline constexpr end_fn end{ … };

} // namespace access

} // namespace folly