folly/folly/system/EnvUtil.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 <map>
#include <string>
#include <unordered_map>
#include <vector>

#include <folly/CPortability.h>
#include <folly/Memory.h>

namespace folly {
namespace experimental {

// Class to model the process environment in idiomatic C++
//
// Changes to the modeled environment do not change the process environment
// unless `setAsCurrentEnvironment()` is called.
struct EnvironmentState { … };

struct FOLLY_EXPORT MalformedEnvironment : std::runtime_error { … };
} // namespace experimental

namespace test {
// RAII class allowing scoped changes to the process environment. The
// environment state at the time of its construction is restored at the time
// of its destruction.
struct EnvVarSaver { … };
} // namespace test
} // namespace folly