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// -*- C++ -*-
//=============================================================================
/**
* @file Env_Value_T.h
*
* 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)
*/
//=============================================================================
#ifndef ACE_ENV_VALUE_T_H
#define ACE_ENV_VALUE_T_H
#include /**/ "ace/pre.h"
#include /**/ "ace/config-all.h"
#include "ace/Global_Macros.h"
#include "ace/OS_NS_stdlib.h"
#include "ace/Copy_Disabled.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Env_Value
*
* @brief Environment Variable Value
*
* Reads a variable from the user environment, providing a default
* value.
*/
template <class T>
class ACE_Env_Value : private ACE_Copy_Disabled
{
public:
/**
* Default constructor which isn't bound to a specific environment
* variable name or a default value. Before being useful it must
* open()'d.
*/
ACE_Env_Value ();
/// Constructor that calls open().
ACE_Env_Value (const ACE_TCHAR *varname, const T &vardefault);
/// Destroy the value.
~ACE_Env_Value ();
/// Returns the value as type T.
operator T ();
/// The constructor, read @a varname from the environment, using
/// @a defval as its value if it is not defined.
void open (const ACE_TCHAR *varname, const T &defval);
/// Returns the name of the variable being tracked.
const ACE_TCHAR *varname () const;
private:
void fetch_value ();
const ACE_TCHAR *varname_;
T value_;
};
/// Function to convert a string @a s into type @c T.
template <class T> void ACE_Convert (const ACE_TCHAR *s, T &t);
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Env_Value_T.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Env_Value_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
template <> inline void
ACE_Convert (const ACE_TCHAR *s, ACE_TCHAR *&v)
{
v = (ACE_TCHAR *) s;
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, const ACE_TCHAR *&v)
{
v = (const ACE_TCHAR *) s;
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, short &si)
{
si = static_cast<short> (ACE_OS::strtol (s, 0, 10));
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, u_short &us)
{
us = static_cast <u_short> (ACE_OS::strtol (s, 0, 10));
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, u_int &i)
{
i = static_cast<u_int> (ACE_OS::strtol (s, 0, 10));
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, long &l)
{
l = ACE_OS::strtol (s, 0, 10);
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, int &i)
{
i = static_cast<int> (ACE_OS::strtol (s, 0, 10));
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, u_long &ul)
{
ul = ACE_OS::strtoul (s, 0, 10);
}
template <> inline void
ACE_Convert (const ACE_TCHAR *s, double &d)
{
d = ACE_OS::strtod (s, 0);
}
// Default calls a CTOR on type T of the form 'T::T(const char*)', but
// users can feel free to create their own specialized conversion
// functions if necessary, as shown above. Note that for 'char*' the
// default is used because a simple cast will be performed and no
// conversion will be necessary.
template <class T> inline void
ACE_Convert (const ACE_TCHAR *s, T &t)
{
t = T (s);
}
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Env_Value_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include /**/ "ace/post.h"
#endif /* ACE_ENV_VALUE_T_H */
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