1 files changed, 162 insertions, 0 deletions
diff --git a/ACE/ace/Env_Value_T.h b/ACE/ace/Env_Value_T.h
new file mode 100644
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--- /dev/null
+++ b/ACE/ace/Env_Value_T.h
@@ -0,0 +1,162 @@
+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    Env_Value_T.h
+ *
+ *  $Id$
+ *
+ *  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 (void);
+
+  /// Constructor that calls open().
+  ACE_Env_Value (const ACE_TCHAR *varname, const T &vardefault);
+
+  /// Destroy the value.
+  ~ACE_Env_Value (void);
+
+  /// Returns the value as type T.
+  operator T (void);
+
+  /// 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 (void) const;
+
+private:
+  void fetch_value (void);
+
+  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 */