environment.h

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// Copyright 2017-2020, Schlumberger
//
// 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 "../declspec.h"
#include <string>
 
namespace InternalZGY {
 
class OPENZGY_TEST_API Environment
{
public:
  static int         getNumericEnv(const char *name, int dflt = 0);
  static std::string getStringEnv(const char *name, const char *dflt = 0);
  static void        putNumericEnv(const char *name, int value);
  static void        putStringEnv(const char *name, const char *value);
private: // class has static members only, should not be instantiated.
  Environment() = delete;
  Environment& operator=(const Environment&) = delete;
};
 
class OPENZGY_TEST_API PushEnvironment
{
  std::string name_;
  std::string oldvalue_;
  PushEnvironment(const PushEnvironment&) = delete;
  PushEnvironment& operator=(const PushEnvironment&) = delete;
public:
  PushEnvironment(const char *name, const char *value = nullptr);
  ~PushEnvironment();
  void restore();
};
 
} // namespace