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b8d773091a
(based on zergtmn's repo commit 3a8c259) (based on zergtmn's repo commit 946c1a8) Signed-off-by: VladimirMangos <vladimir@getmangos.com>
162 lines
3.8 KiB
C++
162 lines
3.8 KiB
C++
// -*- C++ -*-
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//=============================================================================
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/**
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* @file Env_Value_T.h
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*
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* $Id: Env_Value_T.h 91626 2010-09-07 10:59:20Z johnnyw $
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*
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* Template to encapsulate getting a value from an environment variable
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* and using a supplied default value if not in the environment.
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*
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*
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* @author Chris Cleeland (derived from work by Carlos O'Ryan)
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*/
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//=============================================================================
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#ifndef ACE_ENV_VALUE_T_H
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#define ACE_ENV_VALUE_T_H
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#include /**/ "ace/pre.h"
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#include /**/ "ace/config-all.h"
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#include "ace/Global_Macros.h"
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#include "ace/OS_NS_stdlib.h"
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#include "ace/Copy_Disabled.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_Env_Value
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*
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* @brief Environment Variable Value
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*
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* Reads a variable from the user environment, providing a default
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* value.
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*/
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template <class T>
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class ACE_Env_Value : private ACE_Copy_Disabled
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{
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public:
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/**
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* Default constructor which isn't bound to a specific environment
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* variable name or a default value. Before being useful it must
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* <open>'d.
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*/
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ACE_Env_Value (void);
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/// Constructor that calls open().
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ACE_Env_Value (const ACE_TCHAR *varname, const T &vardefault);
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/// Destroy the value.
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~ACE_Env_Value (void);
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/// Returns the value as type T.
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operator T (void);
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/// The constructor, read @a varname from the environment, using
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/// @a defval as its value if it is not defined.
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void open (const ACE_TCHAR *varname, const T &defval);
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/// Returns the name of the variable being tracked.
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const ACE_TCHAR *varname (void) const;
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private:
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void fetch_value (void);
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const ACE_TCHAR *varname_;
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T value_;
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};
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/// Function to convert a string @a s into type @c T.
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template <class T> void ACE_Convert (const ACE_TCHAR *s, T &t);
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ACE_END_VERSIONED_NAMESPACE_DECL
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#if defined (__ACE_INLINE__)
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#include "ace/Env_Value_T.inl"
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#endif /* __ACE_INLINE__ */
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#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
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#include "ace/Env_Value_T.cpp"
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#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, ACE_TCHAR *&v)
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{
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v = (ACE_TCHAR *) s;
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, const ACE_TCHAR *&v)
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{
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v = (const ACE_TCHAR *) s;
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, short &si)
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{
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si = static_cast<short> (ACE_OS::strtol (s, 0, 10));
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, u_short &us)
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{
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us = static_cast <u_short> (ACE_OS::strtol (s, 0, 10));
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, u_int &i)
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{
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i = static_cast<u_int> (ACE_OS::strtol (s, 0, 10));
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, long &l)
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{
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l = ACE_OS::strtol (s, 0, 10);
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, int &i)
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{
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i = static_cast<int> (ACE_OS::strtol (s, 0, 10));
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, u_long &ul)
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{
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ul = ACE_OS::strtoul (s, 0, 10);
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}
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template <> inline void
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ACE_Convert (const ACE_TCHAR *s, double &d)
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{
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d = ACE_OS::strtod (s, 0);
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}
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// Default calls a CTOR on type T of the form 'T::T(const char*)', but
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// users can feel free to create their own specialized conversion
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// functions if necessary, as shown above. Note that for 'char*' the
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// default is used because a simple cast will be performed and no
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// conversion will be necessary.
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template <class T> inline void
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ACE_Convert (const ACE_TCHAR *s, T &t)
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{
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t = T (s);
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}
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ACE_END_VERSIONED_NAMESPACE_DECL
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#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
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#pragma implementation ("Env_Value_T.cpp")
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#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
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#include /**/ "ace/post.h"
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#endif /* ACE_ENV_VALUE_T_H */
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