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# ACE_Env_Value< T > Class Template Reference

Environment Variable Value. More...

`#include <Env_Value_T.h>`

Collaboration diagram for ACE_Env_Value< T >:

[legend]
List of all members.

## Public Member Functions
| ACE_Env_Value (void)
| ACE_Env_Value (const ACE_TCHAR *varname, const T &vardefault)
| Constructor that calls <open>.
| ~ACE_Env_Value (void)
| Destroy the value.
| operator T (void)
| Returns the value as type T.
void | open (const ACE_TCHAR *varname, const T &defval)
const ACE_TCHAR * | varname (void) const
| Returns the name of the variable being tracked.
## Private Member Functions
| ACE_Env_Value (const ACE_Env_Value< T > &)
| Disallow copying and assignment.
ACE_Env_Value< T > | operator= (const ACE_Env_Value< T > &)
void | fetch_value (void)
## Private Attributes
const ACE_TCHAR * | varname_
T | value_

## Detailed Description

### template<class T>
class ACE_Env_Value< T >

Environment Variable Value.

Reads a variable from the user environment, providing a default value.

## Constructor & Destructor Documentation

template<class T>
ACE_INLINE ACE_Env_Value< T >::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>'d.

template<class T>
ACE_INLINE ACE_Env_Value< T >::ACE_Env_Value | ( | const ACE_TCHAR * | varname,
|  | const T & | vardefault
| ) |

| Constructor that calls <open>.

template<class T>
ACE_INLINE ACE_Env_Value< T >::~ACE_Env_Value | ( | void |  | ) |

| Destroy the value.

template<class T>
ACE_Env_Value< T >::ACE_Env_Value | ( | const ACE_Env_Value< T > & |  | ) | `[private]`

| Disallow copying and assignment.

## Member Function Documentation

template<class T>
ACE_INLINE void ACE_Env_Value< T >::fetch_value | ( | void |  | ) | `[private]`

template<class T>
ACE_INLINE void ACE_Env_Value< T >::open | ( | const ACE_TCHAR * | varname,
|  | const T & | defval
| ) |

| The constructor, read varname from the environment, using defval as its value if it is not defined.

template<class T>
ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE ACE_Env_Value< T >::operator T | ( | void |  | ) |

| Returns the value as type T.

template<class T>
ACE_Env_Value<T> ACE_Env_Value< T >::operator= | ( | const ACE_Env_Value< T > & |  | ) | `[private]`

template<class T>
ACE_INLINE const ACE_TCHAR * ACE_Env_Value< T >::varname | ( | void |  | ) | const

| Returns the name of the variable being tracked.

## Member Data Documentation

template<class T>
T ACE_Env_Value< T >::value_`[private]`

template<class T>
const ACE_TCHAR* ACE_Env_Value< T >::varname_`[private]`

The documentation for this class was generated from the following files:

- Env_Value_T.h
- Env_Value_T.inl