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// This may look like C, but it's really -*- C++ -*-
// $Id$
// ============================================================================
//
// = LIBRARY
// ACE
//
// = DESCRIPTION
// Template to encapsulate getting a value from an environment variable
// and using a supplied default value if not in the environment.
//
// = AUTHOR
// Chris Cleeland (derived from work by Carlos O'Ryan)
//
// ============================================================================
#if !defined (ACE_ENV_VALUE_T_H)
# define ACE_ENV_VALUE_T_H
template <class T>
class ACE_Env_Value
//
// = TITLE
// Enviroment Variable Value
//
// = DESCRIPTION
// Reads a variable from the user enviroment, providing a default
// value.
//
// = AUTHOR
// Chris Cleeland, Carlos O'Ryan
//
{
public:
ACE_Env_Value (void);
// Default constructor which isn't bound to a specific environment
// variable name or a default value. Before being useful it must
// <open()>ed.
ACE_Env_Value (const char* varname,
const T& vardefault);
// Constructor which calls <open()>.
~ACE_Env_Value (void);
// Destroy the value.
operator const T (void) const;
// Returns the value as type T.
void open (const char* varname, const T& defval);
// The constructor, read <varname> from the enviroment, using
// <vardefault> as its value if it is not defined.
const char* varname (void) const;
// Returns the name of the variable being tracked.
private:
ACE_UNIMPLEMENTED_FUNC(ACE_Env_Value (const ACE_Env_Value&))
ACE_UNIMPLEMENTED_FUNC(ACE_Env_Value& operator= (const ACE_Env_Value&))
// Disallow copying and assignment.
private:
void fetch_value (void);
const char* varname_;
T value_;
};
template <class T> void ACE_Convert (const char* s, T& t);
// Function to convert a string <s> into type <T>.
#if defined (__ACE_INLINE__)
#include "ace/Env_Value_T.i"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Env_Value_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Env_Value_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif
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