environment.h

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/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * 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 <optional>
#include <string>
#include <string_view>
 
namespace cuttlefish {
 
std::optional<std::string> StringFromEnv(const std::string& varname);
std::optional<std::string> StringFromEnv(const char* varname);
std::optional<std::string> StringFromEnv(std::string_view varname);
 
std::string StringFromEnv(const std::string& varname,
                          const std::string& defval);
std::string StringFromEnv(const char* varname, const std::string& defval);
std::string StringFromEnv(std::string_view varname, const std::string& defval);
 
}  // namespace cuttlefish