Teuchos_EnvVariables.hpp

// @HEADER
// *****************************************************************************
//                    Teuchos: Common Tools Package
//
// Copyright 2004 NTESS and the Teuchos contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER
 
#ifndef TEUCHOS_ENVVARIABLES_HPP
#define TEUCHOS_ENVVARIABLES_HPP
 
#include <string>
#include <string_view>
 
namespace Teuchos {
 
const char* getEnvironmentVariableValue(const char name[]);
 
inline const char* getEnvironmentVariableValue(const std::string& name) {
  return getEnvironmentVariableValue(name.c_str());
}
 
void setEnvironmentVariable(const char name[], const char value[], int overwrite);
 
inline void setEnvironmentVariable(const std::string& name, const std::string& value, int overwrite) {
  setEnvironmentVariable(name.c_str(), value.c_str(), overwrite);
}
 
void unsetEnvironmentVariable(const char name[]);
 
inline void unsetEnvironmentVariable(const std::string& name) {
  unsetEnvironmentVariable(name.c_str());
}
 
template <typename T>
T getEnvironmentVariable(std::string_view environmentVariableName,
                         const T defaultValue);
 
bool idempotentlyGetNamedEnvironmentVariableAsBool(
    const char name[], bool &initialized, const char environmentVariableName[],
    const bool defaultValue);
 
template <typename T>
T idempotentlyGetEnvironmentVariable(
    T &value, bool &initialized, std::string_view environmentVariableName,
    const T defaultValue);
 
} // namespace Teuchos
 
#endif